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    Tytuł:
    Laserowe stanowisko symulacyjne mili pomiarowej
    Measured mile laser simulation post
    Autorzy:
    Panasiuk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/315908.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Naukowo-Wydawniczy "SPATIUM"
    Tematy:
    mila pomiarowa
    laserowe stanowisko symulacyjne
    model redukcyjny
    measured mile
    laser simulation
    scale model
    Opis:
    Artykuł zawiera przedstawienie laserowego stanowiska pomiarowego imitującego Milę Pomiarową w warunkach laboratoryjnych. Poruszono podstawy teoretyczne pomiarów prędkości okrętu i ich odniesienie do modelu. Przedstawione zostały także wyniki pomiarów prędkości modelu redukcyjnego na basenie pomiarowym dla wybranych warunków.
    Paper presents the measured mile full imitation post in laboratory conditions. Theoretical base of ship speed measurement in relate to model was also included. Author presents some model speed measurement results on maneuvering pool for selected conditions.
    Źródło:
    Autobusy : technika, eksploatacja, systemy transportowe; 2013, 14, 3; 1873-1883
    1509-5878
    2450-7725
    Pojawia się w:
    Autobusy : technika, eksploatacja, systemy transportowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    GaInNAs quantum-well vertical-cavity surface-emitting lasers emitting at 2.33 μm
    Autorzy:
    Piskorski, Ł.
    Sarzała, R. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/199958.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    simulation of a diode-laser operation
    QW VCSELs
    mid-infrared radiation
    dilute nitrides
    Opis:
    In the present paper, the comprehensive fully self-consistent optical-electrical-thermal-recombination model is used to determine the optimal structure of the possible GaInNAs quantum-well (QW) tunnel-junction (TJ) vertical-cavity surface-emitting lasers (VCSELs) with single-fundamental-mode operation at 2.33 μm wavelength suited for carbon monoxide sensing applications. From among various considered structures, the diode laser with 4-μm TJ and two 6-nm Ga0.15In0.85N0.015As0.985/Ga0.327In0.673As0.71P0.29 QWs has the lowest threshold current and seems to be optimal for the above applications. Higher threshold currents are obtained for Ga0.15In0.85N0.015As0.985/Al0.138 -Ga0.332In0.530As QW structures but the latter can be grown in reactors without P source which are used for fabrication of GaAs-based devices. Both the modelled VCSELs offer a very promising room temperature continuous wave performance and may represent an alternative choice to GaSb-based lasers.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 3; 737-744
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The evaluation of the efficiency of active control system for aerial bomb
    Autorzy:
    Kowaleczko, G.
    Żyluk, A.
    Pietraszek, M.
    Wijaszka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/244285.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    simulation
    PID controller
    laser-guided bombs
    Opis:
    The article presents the results of numerical simulation of a laser-guided bomb, which is dropped in calm weather conditions. The prototype of such a bomb was developed at the Air Force Institute of Technology. It was a result of the modification process of the classical training bomb. The modification consisted of building on the bomb's board a detection system to track targets that are designated by laser and a control system to adjust bomb’s glide path to precisely strike the target. In the simulation research, geometric and mass characteristics of the classical training bomb were used. Aerodynamic characteristics of the bomb have been determined using commercial software PRODAS. Using the mathematical model of the bomb spatial motion and model of the laser detection system series of simulations were performed. The main goal was to determine the effectiveness of the adopted construction solution. Therefore, simulations were performed for various initial positions of the bomb and fixed position of the target. It allowed finding the set of control laws coefficients giving the most accuracy of the bomb. The influence of structural modifications of the detection system on the possibility of effective detection and location of the target was also investigated. In the article, exemplary results of numerical calculations performed with the author's software are also shown.
    Źródło:
    Journal of KONES; 2018, 25, 4; 165-174
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Strategies of Heating and Hardening External Corners on the Example of Bending Tools for Press Brakes
    Autorzy:
    Nowotyńska, Irena
    Kut, Stanisław
    Powiązania:
    https://bibliotekanauki.pl/articles/2204047.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    bending tool
    laser hardening
    temperature distributions
    FEM simulation
    finite element method simulation
    Opis:
    In the paper the methods of laser hardening of external tool corners on the example of bending tools for press brakes were presented. The disadvantages and limitations of the most commonly used techniques for guiding a hardening laser light beam are presented, i.e.: (i) in one pass parallel to the tool corner plane symmetry, (ii) in two passes perpendicular to the surfaces adjacent to the corner, and (iii) in one pass perpendicular to the surface adjacent to the corner by using two diode lasers. The microstructure of the tool material after laser and induction hardening was compared. A significant influence of the heating method on the microstructure of the tool material after hardening was demonstrated. The original method of hardening the outer corners of bending tools using a hardening laser beam splitter was subject to a more detailed analysis. The analysis of material heating in simultaneously hardened corner area and adjacent surfaces was carried out using the Marc/Mentat software based on the finite element method. By analyzing the temperature distributions it was shown that if a beam splitter was used, obtaining a continuous and uniform hardened layer (i.e. with comparable hardness, depth, without tempered or non-tempered areas) in the area of the outer corner and adjacent surfaces was possible. In practice, achieving such a layer is conditioned by the correct selection of the size of the k parameter which determines the distance between the separated beams of laser light. Depending on the geometry of the hardened tool corner and the parameters of the hardening laser beam, this distance can be determined experimentally or on the basis of numerical simulation.
    Źródło:
    Advances in Science and Technology. Research Journal; 2022, 16, 5; 250--260
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Point-ahead analysis and pre-pointing link stability study of intersatellite laser communication
    Autorzy:
    Zhang, Fu-Rui
    Han, Jun-Feng
    Ruan, Ping
    Powiązania:
    https://bibliotekanauki.pl/articles/174817.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    intersatellite laser communication
    point-ahead
    link stability
    simulation
    Opis:
    The static bias error angle obviously affects pre-pointing links’ stability in the presence of vibration in intersatellite laser communication. The 2nd order point-ahead angle is a source of misalignment which was ignored in most solutions, and this is the concern of our paper. In this study, we present a further analytical investigation into the point-ahead angle in complex satellite maneuvering environment. Static bias error angle induced by the 2nd order point-ahead angle has been studied under different intersatellite links. The probability density function of the pre-pointing links’ outage has been derived in the presence of pointing jitter taking consideration of the static bias angle, and the link budget has also been analyzed. Simulation model of link stability has been established to verify the numerical results by the Monte Carlo method in Matlab-Simulink environment. The results have shown that the 2nd order point-ahead angle has a significant detrimental impact on link stability in long distance links. It is a neglectable factor. This work is dedicated to intersatellite laser communication system design.
    Źródło:
    Optica Applicata; 2020, 50, 1; 111-126
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of through transmission laser welding of Nylon6 by finite element simulation
    Autorzy:
    Gupta, S. K.
    Pal, P. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/407048.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    laser transmission welding
    simulation
    through transmission laser welding
    glass transition temperature
    finite element method
    Opis:
    Over the years laser welding has evolved as a fabrication process capable of overcoming the limitations of conventional joining methodologies. It facilitates the welding of diverse range of materials like metals, non-metals, polymers etc. Laser transmission welding is a technique employed for fabricating intricate shapes/contours in polymers with better precision compared to the other conventional processes. Nylon6, a synthetic semi-crystalline polymer is utilized as an engineering thermoplastic due to its high strength and temperature resistant properties. In the earlier researches, various welding techniques were employed for the fabrication of polymers and metals keeping the laser beam stagnant, and much emphasis was given only to temperature distribution along the different axes and limited attention was given to residual stress analysis. Therefore, in this research work, a three-dimensional time-dependent model using a moving laser beam is used to fabricate unreinforced Nylon6 specimens.
    Źródło:
    Management and Production Engineering Review; 2018, 9, 4; 56-69
    2080-8208
    2082-1344
    Pojawia się w:
    Management and Production Engineering Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Digital factory
    Autorzy:
    Gregor, M.
    Medvecky, S.
    Matuszek, J.
    Stefanik, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/384663.pdf
    Data publikacji:
    2009
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    digital factory
    reverse engineering
    simulation
    3D laser scanning
    Opis:
    The paper presents the results of research and development of the Digital Factory solutions in industry. The implementation of this technology in industry is described and discussed. The results of research and development cover design of assembly system, its processes, simulations model, ergonomic analysis etc. In the paper are presented the solutions developed in the framework of co-operation with industrial partners like Volkswagen Slovakia, Thyssen Krupp - PSL, Whirlpool. The paper contains results of research realized in 3D laser scanning and digitization of large size objects of the current production systems. The developed and validated methodology shows the procedure of 3D laser scanning application by the digitization of production halls, machine tools, equipment, etc. This procedure was tested and validated in chosen industrial companies. The paper presents achieved benefits and future research goals as well.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 3; 123-132
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal Operating Window in Selective Laser Melting Processes
    Autorzy:
    Kozak, Jerzy
    Zakrzewski, Tomasz
    Witt, Marta
    Dębowska-Wąsak, Martyna
    Powiązania:
    https://bibliotekanauki.pl/articles/36833418.pdf
    Data publikacji:
    2023
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    selective laser melting
    SLM
    thermal limitation
    mathematical modeling
    simulation
    Opis:
    Selective laser melting (SLM) is one of the most effective methods of additive manufacturing (AM). It is used to manufacture products with very complex geometries using a wide range of materials. Practical process conditions are limited by the occurrence of undesirable melting instabilities that degrade the surface quality and lead to product defects. These disadvantages are related to the thermal limitations of the SLM process. The lower thermal limit is due to the need to completely melt the powder layer and partially remelt the underlying layer again to ensure proper bonding between the layers. Exceeding the upper thermal limit in the molten metal pool may cause extensive evaporation, boiling and ejection of molten metal droplets outside the melting area. The article presents an approach and methodology that enable the determination of thermal limits and the operating window of SLM/selective laser sintering (SLS) processes in a relatively simple way. The studies have been performed using various settings of SLM process parameters. The usefulness of the preliminary determination of thermal limitations and approximate prediction of operating window of SLM has been confirmed experimentally and by more accurate computer simulation.
    Źródło:
    Transactions on Aerospace Research; 2023, 4 (273); 18-32
    0509-6669
    2545-2835
    Pojawia się w:
    Transactions on Aerospace Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of laser and variable magnetic field simulation on amaranth seeds germination
    Autorzy:
    Dziwulska-Hunek, A
    Kornarzynski, K.
    Matwijczuk, A.
    Pietruszewski, S.
    Szot, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/26336.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    laser
    magnetic field
    simulation
    amaranth
    seed germination
    germination temperature
    Źródło:
    International Agrophysics; 2009, 23, 3; 229-235
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microscale laser shock imprinting of micro-molds with different sizes and shapes
    Autorzy:
    Yang, H.
    Liu, K.
    Liu, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/174650.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    laser shock
    imprinting
    micro-mold
    deformation depth
    numerical simulation
    Opis:
    There are higher requirements for microstructures and high-precision components in microelectronics, photonics, sensors, optoelectronics and medical devices. For changing the traditional manufacturing methods with cumbersome process and complex equipment, researchers put forward a laser shock forming technique which can contribute to the metal forming with high precision and efficiency in recent years. So far, the laser shock forming needed high pulse energy and high energy. In this paper, nanosecond laser with high frequency and low pulse energy was adopted to make possible the aluminum foil forming on the copper micro-molds with different sizes and shapes. The deformations of aluminum foil were measured by SEM, optical profiler and AFM. Also, the deformation laws were analyzed by comparing imprinting results under different micro-molds. Lastly, stress distribution and deformation process of aluminum foil was investigated by numerical simulations.
    Źródło:
    Optica Applicata; 2018, 48, 4; 671-686
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical model of a semiconductor disk laser
    Autorzy:
    Sokół, A. K.
    Sarzała, R. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/174528.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    semiconductor disk laser
    SDL
    vertical-external-cavity surface-emitting laser
    VECSEL
    computer simulation
    numerical modelling
    Opis:
    In this paper we describe the numerical model of a semiconductor disk laser, developed and implemented in the Photonics Group, Institute of Physics, Lodz University of Technology, Poland. It consists of four strongly interrelated components for: carrier transport, heat flow, material gain and optical phenomena calculations. Combination of these components gives the steady-state self-consistent model which enables a simulation of various aspects of a semiconductor disk laser operation. A numerical analysis of carrier and power losses within the active region of 1.3-μm GaInNAs/GaAs semiconductor disk laser has been carried out using this model.
    Źródło:
    Optica Applicata; 2016, 46, 2; 199-211
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of a micro-channel heat sink for cooling of high-power laser diode arrays
    Autorzy:
    Furmański, P.
    Thualfaqir, K.
    Łapka, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/240825.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    micro heat sink
    laser diode arrays cooling
    numerical simulation
    chłodzenie
    laser
    dioda
    radiator
    modelowanie numeryczne
    Opis:
    Micro-channel heat sinks are used in a wide variety of applications, including microelectronic devices, computers and high-energy-laser mirrors. Due to the high power density that is encountered in these devices (the density of delivered electrical power up to a few kW/cm2 ) they require efficient cooling as their temperatures must generally not exceed 100 °C. In the paper a new design for micro-channel heat sink (MCHS) to be used for cooling laser diode arrays (LDA) is considered. It is made from copper and consisting of 37 micro-channels with length of 9.78 mm, width of 190 µm and depth of 180 µm with the deionized water as a cooling medium. Mathematical and numerical models of the proposed design of the heat sink were developed. A series of thermofluid numerical simulations were performed for various volumetric flow rates of the cooling medium, its inlet temperature and different thermal power released in the laser diode. The results show that the LDA temperature could be decreased from 14 to 17% in comparison with earlier proposed design of the heat sink with the further drop in temperature obtained by applying indium instead of gallium arsenide as the soldering material between the LDA and MCHS interface. Moreover, it was found that the maximum temperature, and therefore the thermal resistance of the considered heat sink, could be decreased by increasing the coolant flow rate.
    Źródło:
    Archives of Thermodynamics; 2018, 39, 3; 15-27
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical simulation the finite element method (FEM) of stress and strain for the chosen coatings TBCs on turbine blades loaded with laser impulses
    Autorzy:
    Kosiuczenko, K.
    Napadłek, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/248121.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    superalloy ŻS6K-WI
    laser ablation
    numerical simulation MES
    Opis:
    This paper presents the results of laser ablation the barrier coating TBCs (Al2O3, ZrO2) generated on aircraft engine turbine blade made for nickel base alloy ŻS6K-- WI. Authors used neodymium impulse Nd: YAG laser, radiation with a wavelength of 1064 nm. In parallel with the laboratory experiment was performed numerical simulation of laser ablation. FEM simulation results were used for to choose the relevant laser parameters (impulse duration, impulse shape and course in time, power density) and to identify the temperature distribution heat fluxes and the state of stress and strain in the critical zones of the barrier coating TBCs. The simulation was carried out using the finite element method program LS-Dyna. On the basis of numerical simulation shown the influence of the impact layer TBCs as a thermal insulation and shown place the appearance of destructive deformation. Defined distributed tension as a function of time and estimated time destruction parts the barrier layer during the laser ablation micromachining. Model 3D of the engine turbine blades DV - 2, Analyzed piece of blade, physical model, temperature maps, maps of the reduced stress are presented in the paper
    Źródło:
    Journal of KONES; 2012, 19, 1; 183-186
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Pumping Beam Width on VECSEL Output Power
    Autorzy:
    Sokół, A. K.
    Sarzała, R. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/226018.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    VECSEL
    SDL
    semiconductor disk laser
    simulation
    numerical modeling
    power scaling
    Opis:
    The paper is devoted to a numerical analysis of an influence of a pumping beam diameter on output power of optically pumped vertical-external-cavity surface-emitting lasers. Simulations have been carried out for a structure with a GaInNAs/GaAs active region operating at 1.32 μm. Various assembly configurations have been considered. Results obtained show that laser power scaling is strongly affected by thermal properties of the device.
    Źródło:
    International Journal of Electronics and Telecommunications; 2014, 60, 3; 239-245
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The numerical - experimental analysis of ablative laser cleaning nickel - based superalloy
    Autorzy:
    Kosiuczenko, K.
    Napadłek, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/248048.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    superalloy ŻS6K-WI
    laser ablation cleaning
    numerical simulation MES
    Opis:
    The results of simulation the laser ablation cleaning for the surface of samples made for nickel-based superalloy ŻS6K-WI. this material is use to produce the first-degree blades of aircraft engine turbines. The laboratory investigations were used pulse neodymium laser Nd: YAG and laser ytterbium Nd: Y3Al5O12. In parallel with the experiment was performed numerical simulation of ablation process. The simulation results were used for selection of appropriate laser parameters (duration, pulse form and the course of pulse in time, power density). the short time of the phenomenon of ablation process (similar to 10 ns), the authors have chosen the finite element method (FEM) contained in the LS-Dyna. Since it is known that, the rate of thermal deformation is very large, for modelling the material properties of the material model was used Thermal-Elastic-Plastic. So chosen material model allows the dependence of material parameters (E, alfa, ni, Re, ET, Cp, k) on temperature. Scheme of laser ablation, diagram of laser power density, physical model, identification depth of the ablation, area where the temperature exceeded the melting temperature, in successive moments of loading are presented in the paper.
    Źródło:
    Journal of KONES; 2012, 19, 1; 187-190
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation of Reflected and Scattered Laser Radiation for Designing Laser Shields
    Autorzy:
    Konieczny, P.
    Wolska, A.
    Świderski, J.
    Zając, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/89749.pdf
    Data publikacji:
    2008
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    biological and safety aspects of laser radiation
    shield angle
    computer simulation
    measurements of reflected and scattered laser radiation
    Opis:
    This paper presents a computer simulation of reflected and scattered laser radiation for calculating the angle of laser shields performed with the Laser Shield Solver computer program. The authors describe a method of calculating the shield angle for laser shields which protect workers against reflected and scattered laser radiation and which are made from different materials. The main assumptions of the program, which calculates and simulates reflected laser radiation from any material and which can be used for designing shield angles, are presented. Calculations are compared with measurements of reflected laser radiation. The results for one type of laser and different materials which interacted with a laser beam showed that the Laser Shield Solver was an appropriate tool for designing laser shields and its simulations of reflected laser radiation distribution have practical use.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2008, 14, 2; 133-147
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fabrication of polymer microcomponents using CO2 laser melting technique
    Wytwarzanie mikroelementów polimerowych z zastosowaniem techniki topienia laserem CO2
    Autorzy:
    Tan, W. S.
    Zhou, J. Z.
    Huang, S.
    Zhu, W. L.
    Meng, X. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/947347.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
    Tematy:
    molding
    polymer microcomponents
    CO2 laser
    irradiation
    numerical simulation
    formowanie
    mikroelementy polimerowe
    laser CO2
    napromienianie
    symulacja numeryczna
    Opis:
    A new method of laser melting molding to produce high-efficiency and high-quality polymer microcomponents was proposed. Numerical simulation was used to analyze the temperature changes of polymer melt during the laser irradiation process. An orthogonal experiment was also employed to investigate the factors influencing molding accuracy. The molding experiments were conducted on molds with various degrees of roughness, and the surface quality of the molded pieces was tested. The simulation analysis and experimental results showed that the laser power plays a critical role in improving the repetition accuracy. The next factors are irradiation time and mold temperature, followed by molding force. Optimized technological parameters (1.2 W of laser power, 6 mm of laser beam width, 6 s irradiation time, 150 N molding force, and 80 °C mold temperature) were applied to obtain a molded pieces with high repetition accuracy and a microstructure dimensional deviation of less than 1 µm. Using a mold with lower surface roughness provides that we can obtain a molded piece with lower roughness, the roughness difference between the mold and the molded piece was less than 0.012 µm.
    Zaproponowano nową metodę formowania mikroelementów polimerowych z zastosowaniem topienia laserowego, zapewniającą wysoką wydajność oraz dobrą jakość wytwarzanych mikroelementów. Istotnym parametrem procesu, wpływającym na jakość formowanych elementów, jest temperatura stopu polimeru. Do analizy zmian tej temperatury pod wpływem napromieniania laserem zastosowano symulację numeryczną. Zastosowano także ortogonalny plan eksperymentu w celu zbadania czynników wpływających na dokładność formowania. Formowania przeprowadzono z użyciem form o różnych stopniach chropowatości i zbadano jakość powierzchni mikroelementów. Analiza wyników symulacji i badań eksperymentalnych wykazała, że moc lasera odgrywa kluczową rolę w uzyskaniu powtarzalnej dokładności. Kolejnymi czynnikami są czas napromieniowania i temperatura formy oraz siły formujące. Zoptymalizowane parametry technologiczne (moc lasera 1,2 W, szerokość wiązki lasera 6mm, czas napromieniania 6 s, siła formująca 150 N i temperatura formowania 80 °C) zastosowano do formowania elementów z powtarzalną dużą dokładnością odtwarzania wymiarów (odchylenia wymiarów nie przekraczały 1 µm). Użycie form o mniejszej chropowatości powierzchni pozwalało także uzyskać mniejszą chropowatość mikroelementów, przy czym różnica chropowatości formy i otrzymanego elementu była mniejsza niż 0,012 µm.
    Źródło:
    Polimery; 2015, 60, 3; 192-198
    0032-2725
    Pojawia się w:
    Polimery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Desorption/ablation of lithium fluoride induced by extreme ultraviolet laser radiation
    Autorzy:
    Blejchař, T.
    Nevrlý, V.
    Vašinek, M.
    Dostál, M.
    Kozubková, M.
    Dlabka, J.
    Stachoň, M.
    Juha, L.
    Bitala, P.
    Zelinger, Z.
    Pira, P.
    Wild, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/146227.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    desorption
    fluid dynamics
    lithium fluoride
    numerical simulation
    plume expansion
    pulsed laser ablation
    Opis:
    The availability of reliable modeling tools and input data required for the prediction of surface removal rate from the lithium fluoridetargets irradiated by the intense photon beams is essential for many practical aspects. This study is motivated by the practical implementation of soft X-ray (SXR) or extreme ultraviolet (XUV) lasers for the pulsed ablation and thin fi lm deposition. Specifically, it is focused on quantitative description of XUV laser-induced desorption/ablation from lithium fluoride, which is a reference large band-gap dielectric material with ionic crystalline structure. Computational framework was proposed and employed here for the reconstruction of plume expansion dynamics induced by the irradiation of lithium fluoridetargets. The morphology of experimentally observed desorption/ablation craters were reproduced using idealized representation (two-zone approximation) of the laser fluence profile. The calculation of desorption/ablation rate was performed using one-dimensional thermomechanic model (XUV-ABLATOR code) taking into account laser heating and surface evaporation of the lithium fluoridetarget occurring on a nanosecond timescale. This step was followed by the application of two-dimensional hydrodynamic solver for description of laser-produced plasma plume expansion dynamics. The calculated plume lengths determined by numerical simulations were compared with a simple adiabatic expansion (blast-wave) model. The availability of reliable modeling tools and input data required for the prediction of surface removal rate from the lithium fluoridetargets irradiated by the intense photon beams is essential for many practical aspects. This study is motivated by the practical implementation of soft X-ray (SXR) or extreme ultraviolet (XUV) lasers for the pulsed ablation and thin fi lm deposition. Specifically, it is focused on quantitative description of XUV laser-induced desorption/ablation from lithium fluoride, which is a reference large band-gap dielectric material with ionic crystalline structure. Computational framework was proposed and employed here for the reconstruction of plume expansion dynamics induced by the irradiation of lithium fluoridetargets. The morphology of experimentally observed desorption/ablation craters were reproduced using idealized representation (two-zone approximation) of the laser fluence profile. The calculation of desorption/ablation rate was performed using one-dimensional thermomechanic model (XUV-ABLATOR code) taking into account laser heating and surface evaporation of the lithium fluoridetarget occurring on a nanosecond timescale. This step was followed by the application of two-dimensional hydrodynamic solver for description of laser-produced plasma plume expansion dynamics. The calculated plume lengths determined by numerical simulations were compared with a simple adiabatic expansion (blast-wave) model.
    Źródło:
    Nukleonika; 2016, 61, 2; 131-138
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling and characterization of laser welded incoloy 800 HT joints
    Autorzy:
    Arun Kumar, S.
    Paulraj, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/102190.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    incoloy 800 HT
    laser welding
    modeling and simulation
    mechanical and metallurgical characteristics
    Opis:
    This study aims at finding the effect of laser welding speed on incoloy 800 HT. This alloy is one of the potential materials for Generation IV nuclear plants. Laser welding has several advantages over arc welding such as low fusion zone, low heat input and concentrated heat intensity. Three different welding speeds were chosen and CO2 laser welding was performed. 2D modeling and simulation were done using ANSYS 15 to find out the temperature distribution at different welding speeds and it was found that an increase in the welding speed decreased the temperature. Mechanical properties such as tensile strength, toughness and hardness were evaluated. The effect of welding speed on metallurgical characteristics was studied using optical microscopy (OM), Scanning Electron Microscopy (SEM) with EDS, X-Ray Diffraction (XRD) technique and fractographic analysis. From the results it was found that high welding speed (1400 mm/min) decreased the joint strength. The M23C6 and Ni3Ti carbides were formed in a discrete chain and in a globular form along the grain boundaries of the weld region which increased the strength of the grain boundaries. Fractographic evaluations of the tested specimens for welding speed (1000 and 1200) mm/min showed deep and wide dimples indicating ductile failures.
    Źródło:
    Advances in Science and Technology. Research Journal; 2016, 10, 30; 115-126
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurements and numerical simulations of laser hardening and remelting thermal cycles
    Autorzy:
    Kik, T.
    Wyględacz, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/368669.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    hardening
    remelting
    WCL steel
    diode laser
    thermal cycle
    SYSWELD
    numerical simulation
    hartowanie
    przetapianie
    stal WCL
    laser diodowy
    obieg cieplny
    symulacja numeryczna
    Opis:
    Purpose: of these researches was to investigate the influence of thermal cycles recording conditions and comparing them with the calculated by FEM. This approach allows proposing a new way of determining the technological conditions of the process, based on numerical analyses. Design/methodology/approach: Thermal cycles of high power diode laser hardening and remelting was recorded and calculated by FEM. Results of metallographic examinations were compared with numerical simulations results, as well as the thermographic pictures. Acquisition errors during the thermal cycles were also defined. Findings: Due to the fact that the it was used FEM, comparison of the numerical analyses with real test results was performed for laser hardening and remelting process. Research limitations/implications: For complete information it is needed to collect bigger database of the results and prepare also hardness calculation model for WCL steel. Practical implications: The result of the presented work is to signal a methodology that allows obtaining information on the impact of the parameters of the laser hardening and remelting process on the properties of the treated samples. Not without significance is the fact that the use of FEM eliminates in this case a lot of errors that in real tests can distort the result. Originality/value: The researches were provided for high power diode laser hardening and remelting. The influence of heat input on layers properties and theirs structure was defined. Results were compared with thermographic pictures and calculated cases.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2019, 96, 2; 69-82
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hot electron refluxing in the short intense laser pulse interactions with solid targets and its influence on K-α radiation
    Autorzy:
    Horný, W.
    Klimo, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/148753.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    electron recirculation
    electron refluxing
    K-α radiation
    laser–plasma interactions
    particle-in-cell simulation
    Opis:
    Fast electrons created as a result of the laser beam interaction with a solid target penetrate into the target material and initialize processes leading to the generation of the characteristic X-ray K-α radiation. Due to the strong electric field induced at the rear side of a thin target the transmitted electrons are redirected back into the target. These refl uxing electrons increase the K-α radiation yield, as well as the duration of the X-ray pulse and the size of the radiation emitting area. A model describing the electron refl uxing was verifi ed via particle- -in-cell simulations for non-relativistic electron energies. Using this model it was confi rmed that the effect of the electron refluxing on the generated X-ray radiation depends on the target thickness and the target material. A considarable increase of the number of the emitted K-α photons is observed especially for thin targets made of low-Z materials, and for higher hot electron temperatures.
    Źródło:
    Nukleonika; 2015, 60, 2; 233-237
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Columnar Dendrite Morphology and Solute Concentration of GH3039 Nickel-Based Superalloys during Wire and Laser Additive Manufacturing: Insights from Phase Field Simulations
    Autorzy:
    Zong, Nanfu
    Wang, Zheng
    Liu, Yang
    Liang, Xinghong
    Jing, Tao
    Powiązania:
    https://bibliotekanauki.pl/articles/2203717.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wire and laser additive manufacturing
    phase field simulation
    solute concentration
    interface crystallographic deflection
    columnar dendrite
    Opis:
    Wire and laser additive manufacturing (WLAM) can produce outstanding mechanical properties of GH3039 nickel-based superalloys. A quantitative rapid phase field model with solute trapping kinetics has been developed during the rapid solidification process, where a range of process conditions are considered in terms of thermal gradients and pulling speeds. Intergranular hot cracking is found to occur at boundaries of tilted columnar dendrite in the GH3039 nickel-based superalloys. The simulations demonstrate that the phase field model considering the interface deflection can represent the dendrite growth during additive manufacturing more realistically. With the aid of numerical simulations, it is determined that dendrite growth morphologies transform from symmetrical columnar dendrite to tilted columnar dendrite as the interface crystallographic deflection is increased, while increasing the deflection angle can lead to uneven composition of material matrix, especially at the columnar dendrite interface. Solute concentrations at the columnar dendrite interface tend to promote hot cracking in additively manufactured Ni-based superalloy.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 1; 387--393
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Tilted Columnar Dendrites at Grain Boundaries During Wire and Laser Additive Manufacturing: a Phase-Field Study
    Autorzy:
    Zong, Nanfu
    Sun, Weizhao
    Liang, Xinghong
    Jing, Tao
    Powiązania:
    https://bibliotekanauki.pl/articles/27313866.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    wire and laser additive manufacturing
    tilted columnar dendrites
    overgrowth behavior
    phase field simulation
    grain boundary
    Opis:
    Tilted columnar dendritic morphologies are usually existed in wire and laser additive manufactured parts of GH3039 alloy. Overgrowth behaviors induced by the tilted dendritic arrays with a large tilted angle, and the effect of the angle between the growth direction and the direction vertical locally to the solid substrate on primary spacing, solute concentration and morphological evolution have been investigated at both the converging and the diverging grain boundaries through the phase-field simulation. The formation of cracking depends on solidification behaviors including columnar dendrites growth and micro-segregation in the interdendritic region. Furthermore, the effect of the tilted columnar dendrites on the susceptibility of crack is investigated during wire and laser additive manufacturing.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 2; 469--475
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new BEM for modeling and simulation of 3T MDD laser-generated ultrasound stress waves in FGA smart materials
    Autorzy:
    Fahmy, Mohamed A.
    Powiązania:
    https://bibliotekanauki.pl/articles/29520102.pdf
    Data publikacji:
    2021
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    oundary element method
    modeling and simulation
    three-temperature
    memory-dependent derivative
    laser ultrasonic
    nonlinear thermal stress waves
    functionally graded anisotropic
    smart materials
    Opis:
    The goal of this study is to present a new theory known as the three-temperature memory-dependent derivative (MDD) of ultrasound stress waves in functionally graded anisotropic (FGA) smart materials. It is extremely difficult to address the difficulties related to this theory analytically due to its severe nonlinearity. As a result, we suggest a new boundary element method (BEM) to solve such equations. The suggested BEM technique incorporates the benefits of both continuous and discrete descriptions. The numerical results are visually represented to demonstrate the impacts of MDD three temperatures and anisotropy on the ultrasound stress waves in FGA smart materials. The numerical findings verify the proposed methodology’s validity and accuracy. We may conclude that the offered results are useful for comprehending the FGA smart materials. As a result, our findings contribute to the advancement of the industrial applications of FGA smart materials.
    Źródło:
    Computer Methods in Materials Science; 2021, 21, 2; 95-104
    2720-4081
    2720-3948
    Pojawia się w:
    Computer Methods in Materials Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Badania lotu przeciwpancernego pocisku kierowanego Pirat z funkcją „top attack”
    Investigations of the PIRAT Anti-tank Guided Missile Flight with the „Top attack” Function
    Autorzy:
    Gołoś, Damian
    Zawada, Paweł
    Noga, Janusz
    Motyl, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/27314944.pdf
    Data publikacji:
    2023
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    sterowanie lotu pocisku rakietowego
    symulacja komputerowa
    przeciwpancerny pocisk kierowany
    naprowadzanie laserowe
    missile flight control
    computer simulation
    anti-tank guided missile
    laser guidance
    Opis:
    W niniejszej pracy przedstawiono budowę i zasadę działania przeciwpancernego pocisku kierowanego Pirat z funkcją „top attack”. Pocisk przeszedł pomyślnie testy na stanowisku laboratoryjnym oraz testy poligonowe. Przedstawiono również wyniki badań symulacyjnych lotu pocisku Pirat, które porównano z wynikami badań poligonowych. Badania symulacyjne przeprowadzono w oparciu o opracowany model matematyczno-fizyczny pocisku. Uzyskane wyniki potwierdzają poprawność założeń i charakterystyk przyjętych w modelu symulacyjnym.
    The paper presents the structure and principle of operation of the PIRAT anti-tank guided missile (ATGM) with the „top attack” function. PIRAT is a light anti-tank missile guided to the target using Semi-Active Laser Homing (SALH) method. A system maximum range is 2500 m. The missile has successfully passed laboratory and field tests. The results of the PIRAT missile flight simulation tests have been presented and compared with the results of field tests. The simulation tests were carried out on the basis of the created mathematical and physical models of the missile. The obtained results confirm the correctness of the assumptions and characteristics adopted for the simulation model. A distance between a missile launcher and a target during field test, presented in the paper, was 2400 m. Missile behaviour in flight was consistent with the simulation results, what is shown in figures 9, 10, and 11. The velocity of the projectile throughout the flight was sufficient to provide adequate control force. The velocity vector of the projectile at the moment of impact with the target is inclined to the horizontal plane at an angle of -26ᵒ. Approximately 0.2 s before missile hitting the target, an inclination angle of the projectile body was -35ᵒ. This is due to high value of control command signal developed by the autopilot at that moment. In the actual moment of missile hitting, the target value of control command signal was low causing a change of an inclination angle of the projectile body up to the value of -23ᵒ. It is advisable to modify the PIRAT’s missile control algorithm to increase an inclination angle of the velocity vector at the moment of missile hitting the target, as well as to increase an angle of inclination of the missile body when it hits the target.
    Źródło:
    Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2023, 14, 3 (53); 9--24
    2081-5891
    Pojawia się w:
    Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Laser melted steel free surface formation
    Tworzenie powierzchni swobodnej laserowo przetapianej stali
    Autorzy:
    Siwek, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/264124.pdf
    Data publikacji:
    2007
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    obróbka laserowa
    modelowanie
    analiza numeryczna
    efekt Marangoniego
    konwekcja, geometria strefy przetopionej
    laser treatment
    simulation
    numerical analysis
    Marangoni effect
    convection
    geometry of the melted zone
    Opis:
    Two-dimensional mathematical model of recasting steel by laser was presented in this paper. Surface velocity and liquid temperature for several powers of laser beams and sulfur contents were obtained as results of numerical modeling of liquid flow and heat exchange processes. The shape of free surface in a melted zone was computed with the use of iterative method proposed in this paper.
    W pracy zaprezentowano dwuwymiarowy model matematyczny laserowego przetapiania stali. Jako wynik numerycznego modelowania procesów przepływu cieczy i wymiany ciepła, otrzymano pole prędkości i temperatury cieczy dla kilku mocy wiązki laserowej oraz zawartości siarki. Korzystając z zaproponowanej w pracy metody iteracyjnej, obliczono kształt powierzchni swobodnej w strefie przetopionej.
    Źródło:
    Metallurgy and Foundry Engineering; 2007, 33, 1; 13-21
    1230-2325
    2300-8377
    Pojawia się w:
    Metallurgy and Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Projektowanie i analiza zastosowań technologii napawania laserowego dla branży lotniczej
    Design and applications analysis of laser cladding technology for aviation industry
    Autorzy:
    Koruba, P.
    Boratyński, T.
    Jurewicz, P.
    Koenig, G.
    Szaroleta, M.
    Reiner, J.
    Chlebus, E.
    Dworak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/196179.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
    Tematy:
    komputerowe wspomaganie procesów
    symulacje multifizyczne
    powłoki funkcjonalne
    regeneracja łopatek
    napawanie hybrydowe
    computer aided process development
    multiphysics simulation
    functional coating
    repair of turbine blades
    hybrid laser cladding
    Opis:
    Technologia napawania laserowego polega na wykorzystaniu wiązki laserowej celem precyzyjnego nałożenia warstwy materiału o podwyższonych właściwościach na podłoże. Szczególne zainteresowanie budzi ona w branży lotniczej. Odpowiednie przygotowanie procesu wiąże się z wykonaniem testów symulacyjnych z wykorzystaniem modeli przepływu dwufazowego oraz interakcji wiązki laserowej z materiałem. Następnie zostają wyznaczone ścieżki ruchu głowicy przy użyciu dedykowanych narzędzi CAD/CAM. W ramach analizy technologii napawania laserowego dla zastosowań branży lotniczej przedstawiono nakładanie powłok funkcjonalnych, będących alternatywą dla chromu elektrolitycznego. Przeanalizowano również metodę regeneracji wierzchołka łopatki turbiny silnika odrzutowego. Zaprezentowano też możliwości obróbki hybrydowej w wytwarzaniu przyrostowym tytanowych komponentów lotniczych oraz metodę monitorowania temperatury celem jakościowej kontroli procesu.
    The laser cladding technology consists of the use of laser beam for precise deposition of a material layer with enhanced properties to the substrate. Therefore it finds special interest in the aviation industry. Appropriate preparation of the process involves performing simulation tests using two-phase flow models and laser beam interaction with material. Subsequently, the laser head movement paths are determined using dedicated CAD/CAM software. In the analysis of laser cladding technology applications for the aviation industry, the deposition of functional coatings, being an alternative to electrolytic chromium, was presented. Secondly, the repair of turbine blade tip was also analyzed. Moreover the capabilities of hybrid laser cladding technology with machining for the additive manufacturing aviation components made of titanium alloys were presented, as well as the method of temperature monitoring for the purpose of qualitative process control implementation.
    Źródło:
    Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika; 2018, z. 90 [298], 3; 309-321
    0209-2689
    2300-5211
    Pojawia się w:
    Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Symulacja numeryczna laserowego umacniania udarowego stopu tytanu Ti-6Al-2Cr-2Mo
    The numerical simulation of laser shot peening of Ti-6Al-2Cr-2Mo titanium alloy
    Autorzy:
    Napadłek, W.
    Kosiuczenko, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/159612.pdf
    Data publikacji:
    2008
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
    Tematy:
    stop tytanu Ti-6Al-2Cr-2Mo
    laserowe umacnianie udarowe
    topografia powierzchni
    mikrostruktura
    symulacja numeryczna MES
    titanium alloy
    Ti-6Al-2Cr-2Mo
    laser shot peening
    surface topography
    microstructure
    numerical simulation
    Opis:
    W artykule przedstawiono wybrane wyniki eksperymentów laboratoryjnych wykonanych na stopie tytanu Ti-6Al-2Cr-2Mo. Opisano model fizyczny, opracowano model numeryczny, wykonano opis matematyczny zjawisk fizycznych zachodzących przy umacnianiu laserowym LSP (metoda MRS). Wykonano siatki modeli MES stanu odkształceń i naprężeń własnych dla badanego materiału w wybranych wariantach technologicznych. Przeprowadzone symulacje numeryczne potwierdziły poprawność przyjętych założeń i modeli. Stan wytężenia materiału po wielokrotnym obciążeniu udarowym (LSP) nie zmienia się proporcjonalnie do ilości impulsów laserowych - ma charakter nieliniowy.
    The selected results of laboratory experiments made on the Ti-6Al-2Cr-2Mo titanium alloy were presented in the paper. It was described the physical model, was elaborated of numerical model, was made mathematical description of physical phenomena, which occur at laser shot peening (LSP). It were made networks of FEM models of strain state and internal stresses for tested material in the selected technological variants. Conducted numerical simulations were confirmed correctness of established assumption and models. The effort state of material after multiple shot peening (LPS) does not change in proportion to amount of laser impulses - it has nonlinear character.
    Źródło:
    Prace Instytutu Elektrotechniki; 2008, 237; 31-44
    0032-6216
    Pojawia się w:
    Prace Instytutu Elektrotechniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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