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Tytuł:
Numerical Evaluation of the Vibration Reduction Index for Structural Joints
Autorzy:
Ramis, J.
Segovia, E.
Alba, J.
Carbajo, J.
Godinho, L.
Powiązania:
https://bibliotekanauki.pl/articles/177736.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
finite element model
vibration reduction
structural joints
Opis:
The present paper addresses the analysis of structural vibration transmission in the presence of struc- tural joints. The problem is tackled from a numerical point of view, analyzing some scenarios by using finite element models. The numerical results obtained making use of this process are then compared with those evaluated using the EN 12354 standard vibration reduction index concept. It is shown that, even for the simplest cases, the behavior of a structural joint is complex and evidences the frequency dependence. Comparison with results obtained by empirical formulas reveals that those of the standards cannot accurately reproduce the expected behavior, and thus indicate that alternative complementary calculation procedures are required. A simple methodology to estimate the difference between numerical and standard predictions is here proposed allowing the calculation of an adaptation term that makes both approaches converge. This term was found to be solution-dependent, and thus should be evaluated for each structure.
Źródło:
Archives of Acoustics; 2012, 37, 2; 189-197
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental and numerical investigation of plywood progressive failure in CT tests
Autorzy:
Ivanov, I. V.
Sadowski, T.
Filipiak, M.
Kneć, M.
Powiązania:
https://bibliotekanauki.pl/articles/390258.pdf
Data publikacji:
2008
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
plywood
veneer
progressive failure
damage
finite element model
finite element simulation
Opis:
The plywood is considered as a layered cross-ply unidirectional fibre reinforced composite. The experimental Compact Tension (CT) tests carried out in different directions of plywood fibre orientation show that the characteristics of damages are fibre bundle rupture, matrix cracking along the fibres, and delamination at the ply interlayers of glue. The plywood CT specimens are modelled by continuum shell and cohesive finite elements with damage evolution in material models. The Finite Element (FE) model simulates the experimental behaviour of plywood samples very well and allows deep investigation of the different types of damage development and interaction. The FE model of plywood is useful for its lay-up optimization and for development of very efficient in large-scale simulations computational models of plywood.
Źródło:
Budownictwo i Architektura; 2008, 2, 1; 79-94
1899-0665
Pojawia się w:
Budownictwo i Architektura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Differences in Lumbar Spine Load Due to Posture and Upper Limb External Load
Autorzy:
Kamińska, J.
Roman-Liu, D.
Zagrajek, T.
Borkowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/89864.pdf
Data publikacji:
2010
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
finite element model
muscle co-operation
spine load
lumbar spine
Opis:
As the lumbar region of the spine is particularly predisposed to musculoskeletal disorders, the aim of this article was to assess lumbar spine load on the basis of an accurate model of this part of the body. The model was developed with the finite element method and the energy criterion for optimising muscle work. Computer calculations confirmed that stresses and compression forces in intervertebral discs increased with an increase in the load force and that they were significantly larger in the bent forwards posture than in the erect posture. This result clearly shows that lifting light objects and the erect posture are important elements in minimising spine load.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2010, 16, 4; 421-430
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The finite element model of the human rib cage
Numeryczny model klatki piersiowej
Autorzy:
Awrejcewicz, J.
Łuczak, B.
Powiązania:
https://bibliotekanauki.pl/articles/280836.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
finite element model
thorax
rib cage
Nuss implant
pectus excavatum
Opis:
In the paper, finite element analysis of the rib cage model is applied to recognize stress distributions and to determine the rate of bone fractures (especially for pathologically changed bones). Two thorax models are considered and the role of the implant is illustrated and discussed. The simulation result shows a good agreement wit h the cadaver test data.
Artykuł przedstawia analizę wytrzymałościową klatki piersiowej metodą elementów skończonych. Przeprowadzone badania pozwalają na poznanie rozkładu naprężeń i odkształceń w klatce piersiowej oraz na ocenę miejsc najbardziej narażonych na złamania. Rozpatrzono dwa modele klatki piersiowej: pierwszy człowieka zdrowego oraz drugi człowieka po chirurgicznej operacji lejkowatej klatki piersiowej z zastosowaniem implantu. Opisano wpływ implantu na wytrzymałość klatki piersiowej.
Źródło:
Journal of Theoretical and Applied Mechanics; 2007, 45, 1; 25-32
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coupling Characteristics of Needles and Backing Cloth During the Carpet Tufting Process
Autorzy:
Xu, Yang
Huang, Shuang
Sheng, Xiaowei
Zhijun, Sun
Powiązania:
https://bibliotekanauki.pl/articles/2171994.pdf
Data publikacji:
2022
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
tufted carpet
finite element model
needle force
deformation
backing cloth
Opis:
Focusing on the needle and backing cloth on a tufting machine type DHG801D-200, a finite element model was built using ABAQUS/Explicit software. The tufting processes, in which the individual tufting needles and 1/10 needle modules puncture the polypropylene woven and nonwoven fabrics (hot-air bonded nonwoven and thermo-calender bonded nonwoven), were simulated, respectively. Finally, the needle forces were estimated, and the deformations and stress field distribution of the backing cloth at different times were analysed.
Źródło:
Fibres & Textiles in Eastern Europe; 2022, 3 (151); 9--17
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A finite element model development as a part of process of energy absorption material selection
Autorzy:
Jakubowski, R.
Skorupka, Z.
Powiązania:
https://bibliotekanauki.pl/articles/244612.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
RASTAS Spear
material
energy absorption
finite element model
LS-DYNA
Opis:
The Warsaw Institute of Aviation major role in the RASTAS Spear project was to design an energy absorption system for the space probe lander. As the system was meant to be unmanned, the main requirement was to use no active solutions like parachute or rocket propulsion (less complexity in application and thus more reliability). A group of various materials was chosen to be tested. Tests campaign was divided into three stages: static compression tests, low speed dynamic tests and high speed dynamic tests. The high-speed dynamic tests were divided into two substages. In the first one simple cube specimens were tested to obtain data necessary for second substage in which full-scale object was tested. Having valuable data from experiments, numerical simulations in LS-DYNA software were carried out and then the results were compared. Based on experimental data several iterations during finite element model developing process were made. That process allowed setting up properly simulation by changing and adjusting properties such: material models, contact types, element formulation and other important constants. The finite element simulation results showed a good correlation with experimental data. The knowledge gained from numerical model optimization in connection with experimental data allowed for creating faster and more accurate energy absorbing material selection methodology. This methodology was successfully used in subsequent projects in which Institute of Aviation took part and also can be used in other future applications.
Źródło:
Journal of KONES; 2016, 23, 3; 217-223
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristic Investigation of Macro Fiber Composite Structure Using FE Model
Autorzy:
Saravanan, M. P.
Marimuthu, Krishnaswamy
Jayabal, Kaliappan
Powiązania:
https://bibliotekanauki.pl/articles/2049129.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
macro-fiber composite
finite-element model
piezoelectric composite
ANSYS
RVE method
Opis:
In this investigation, the effective mechanical, coupling and dielectric properties of Macro-fiber-composites (MFCs) consisting of piezorod-element constituents are determined using representative volume element method combined with finite element analysis. Experiments are conducted on piezo-bar-element MFCs to understand the applicability of the proposed approach which would later be extended to composites with modified geometric pattern. The longitudinal strains with respect to static deflections of beam and forced displacements under varying electrical loads are measured for the MFCs, and compared with the numerical simulations. Based on the good agreement from the result comparisons of piezo-bar-element MFCs, the effective material properties of piezo-rod-element MFCs are numerically determined based on the RVE approach.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 4; 1059-1066
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature distribution in multi domain construction of the permanent magnet linear actuator
Autorzy:
Tomczuk, B.
Waindok, A.
Powiązania:
https://bibliotekanauki.pl/articles/140715.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
linear actuators
thermal field models
heating curves calculation
finite element model
Opis:
The transient thermal model of the permanent magnet linear actuator (PMLA) has been considered. The characteristics of heating have been calculated including the main subdomains of the actuator. The carcasses from various materials have also been considered. The calculations have been verified experimentally and a good conformity was obtained.
Źródło:
Archives of Electrical Engineering; 2013, 62, 3; 417-424
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal-mechanical finite element simulation of flat bar rolling coupled with a stochastic model of microstructure evolution
Autorzy:
Szeliga, Danuta
Czyżewska, Natalia
Kusiak, Jan
Kuziak, Roman
Morkisz, Paweł
Oprocha, Piotr
Pietrzyk, Maciej
Piwowarczyk, Michał
Poloczek, Łukasz
Przybyłowicz, Paweł
Rauch, Łukasz
Wolańska, Natalia
Powiązania:
https://bibliotekanauki.pl/articles/29520070.pdf
Data publikacji:
2022
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
flat bars
hot rolling
thermal-mechanical finite element model
microstructure evolution
stochastic model
Opis:
It is generally recognized that the kinetics of phase transformations during the cooling of steel products depends to a large extent on the state of the austenite after rolling. Austenite deformation (when recrystallization is not complete) and grain size have a strong influence on the nucleation and growth of low-temperature phases. Thus, the general objective of the present work was the formulation of a numerical model which simulates thermal, mechanical and microstructural phenomena during multipass hot rolling of flat bars. The simulation of flat bar rolling accounting for the evolution of a heterogeneous microstructure was the objective of the work. A conventional finite-element program was used to calculate the distribution of strains, stresses, and temperatures in the flat bar during rolling and during interpass times. The FE program was coupled with the stochastic model describing austenite microstructure evolution. In this model, the random character of the recrystallization was accounted for. Simulations supplied information about the distributions of the dislocation density and the grain size at various locations through the thickness of the bars.
Źródło:
Computer Methods in Materials Science; 2022, 22, 3; 137-148
2720-4081
2720-3948
Pojawia się w:
Computer Methods in Materials Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of crack resistance in epoxy/boron nitride nanotube nanocomposites based on multi-scale methodInvestigation of crack resistance in epoxy/boron nitride nanotube nanocomposites based on multi-scale method
Autorzy:
Hemmatian, Hossein
Zamani, Mohammad Reza
Jam, Jafar Eskandari
Powiązania:
https://bibliotekanauki.pl/articles/280181.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
boron nitride nanotube
epoxy
fracture modes
finite element model
multi-scale method
Opis:
Boron nitride nanotubes (BNNTs) possess superior mechanical, thermal and electrical properties and are also suitable for biocomposites. These properties make them a favorable reinforcement for nanocomposites. Since experimental studies on nanocomposites are timeconsuming, costly, and require accurate implementation, finite element analysis is used for nanocomposite modeling. In this work, a representative volume element (RVE) of epoxy/BNNT nanocomposites based on multi-scale modeling is considered. The bonds of BNNT are modeled by 3D beam elements. Also non-linear spring elements are employed to simulate the van der Waals bonds between the nanotube and matrix based on the Lennard- -Jones potential. Young’s and shear modulus of BNNTs are in ranges of 1.039-1.041 TPa and 0.44-0.52 TPa, respectively. Three fracture modes (opening, shearing, and tearing) have been simulated and stress intensity factors have been determined for a pure matrix and nanocomposite by J integral. Numerical results indicate that by incorporation of BNNT in the epoxy matrix, stress intensity factors of three modes decrease. Also, by increasing the chirality of BNNT, crack resistance of shearing and tearing modes are enhanced, and stress intensity factor of opening mode reduced. BNNTs bridge the crack surface and prevent crack propagation.
Źródło:
Journal of Theoretical and Applied Mechanics; 2019, 57, 1; 207-219
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Timoshenko beam model for vibration analysis of composite steel-polymer concrete box beams
Autorzy:
Niesterowicz, Beata
Dunaj, Paweł
Berczyński, Stefan
Powiązania:
https://bibliotekanauki.pl/articles/2055041.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
Timoshenko beam
Euler-Bernoulli beam
free vibration
composite beam
finite element model
Opis:
The free vibration model of a steel-polymer concrete beam based on Timoshenko beam theory is presented in this paper. The results obtained on the basis of the model analysis, describing the values of the natural frequencies of the beam vibrations, were compared with the results obtained by the solution of the model formulated on the basis of the classical Euler-Bernoulli beam theory, the finite element model and the results of experimental studies. The developed model is characterized by high compliance with experimental data: the relative error in the case of natural vibration frequencies does not exceed 0.4%, on average 0.2%.
Źródło:
Journal of Theoretical and Applied Mechanics; 2020, 58, 3; 799--810
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the finite element model on the inverse determination of the heat transfer coefficient distribution over the hot plate cooled by the laminar water jets
Wpływ modelu metody elementów skończonych na współczynnika wymiany ciepła wyznaczany z rozwiązania odwrotnego procesu laminarnego chłodzenia płyty metalowej
Autorzy:
Hadała, B.
Malinowski, Z.
Telejko, T.
Szajding, A.
Powiązania:
https://bibliotekanauki.pl/articles/350884.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
współczynnik przenikania ciepła
metoda elementów skończonych
head transfer coefficient
finite element model
inverse solution
Opis:
The industrial hot rolling mills are equipped with systems for controlled cooling of hot steel products. In the case of strip rolling mills the main cooling system is situated at run-out table to ensure the required strip temperature before coiling. One of the most important system is laminar jets cooling. In this system water is falling down on the upper strip surface. The proper cooling rate affects the final mechanical properties of steel which strongly dependent on microstructure evolution processes. Numerical simulations can be used to determine the water flux which should be applied in order to control strip temperature. The heat transfer boundary condition in case of laminar jets cooling is defined by the heat transfer coefficient, cooling water temperature and strip surface temperature. Due to the complex nature of the cooling process the existing heat transfer models are not accurate enough. The heat transfer coefficient cannot be measured directly and the boundary inverse heat conduction problem should be formulated in order to determine the heat transfer coefficient as a function of cooling parameters and strip surface temperature. In inverse algorithm various heat conduction models and boundary condition models can be implemented. In the present study two three dimensional finite element models based on linear and non-linear shape functions have been tested in the inverse algorithm. Further, two heat transfer boundary condition models have been employed in order to determine the heat transfer coefficient distribution at the hot plate cooled by laminar jets. In the first model heat transfer coefficient distribution over the cooled surface has been approximated by the witch of Agnesi type function with the expansion in time of the approximation parameters. In the second model heat transfer coefficient distribution over the cooled plate surface has been approximated by the surface elements serendipity family with parabolic shape functions. The heat transfer coefficient values at surface element nodes have been expanded in time by the cubic-spline functions. The numerical tests have shown that in the case of heat conduction model based on linear shape functions inverse solution differs significantly from the searched boundary condition. The dedicated finite element heat conduction model based on non-linear shape functions has been developed to ensure inverse determination of heat transfer coefficient distribution over the cooled surface in the time of cooling. The heat transfer coefficient model based on surface elements serendipity family is not limited to a particular form of the heat flux distribution. The solution has been achieved for measured temperatures of the steel plate cooled by 9 laminar jets.
Nowoczesne linie walcowania blach na gorąco posiadają instalacje do wymuszonego chłodzenia. Jego celem jest kontrolowanie szybkości zmian temperatury blachy w całej objętości zapewniając tym wymaganą strukturę i własności mechaniczne. Chłodzenie jest prowadzone w końcowej części linii technologicznej, w której nad górną i pod dolną powierzchnią gorącego pasma umieszczone są urządzenia dostarczające wodę chłodzącą. Z uwagi na sposób podawania wody chłodzącej można je podzielić na trzy główne systemy: chłodzenie laminarne, chłodzenie z użyciem kurtyn wodnych oraz chłodzenie natryskiem wodnym. W istniejących liniach walcowniczych można spotkać kombinacje poszczególnych systemów. Projektowanie systemów chłodniczych jest trudne i musi być wspomagane przez modele matematyczne i numeryczne wymiany ciepła między gorącą powierzchnią blachy a wodą i otoczeniem. Podstawowe znaczenie dla symulacji procesu ma przyjęcie poprawnych wartości współczynników wymiany ciepła, których znajomość w dużej mierze determinuje dokładność obliczeń. Współczynnik wymiany ciepła nie może być zmierzony bezpośrednio i konieczne jest zastosowanie rozwiązań odwrotnych zagadnienia przewodzenia ciepła. W algorytmach odwrotnych możliwe jest użycie różnych modeli do rozwiązania równania przewodzenia ciepła. Zastosowane modele w istotnym stopniu wpływają na jakość rozwiązania odwrotnego. W pracy przedstawiono wyniki testów dwóch modeli przewodzenia ciepła opartych na liniowych i nieliniowych funkcjach kształtu w algorytmie metody elementów skończonych. Testowano również dwa modele aproksymacji warunku brzegowego. Wybrany model warunku brzegowego i model metody elementów skończonych wykorzystujący nieliniowe funkcje kształtu zastosowano do wyznaczenia współczynnika wymiany ciepła w procesie chłodzenia gorącej płyty stalowej 9 strumieniami wody swobodnie opadającej na jej powierzchnie. Uzyskano rozwiązanie przedstawiajace rozkład współczynnika wymiany ciepła i gęstości strumienia ciepła na powierzchni płyty w czasie jej chodzenia.
Źródło:
Archives of Metallurgy and Materials; 2013, 58, 1; 105-112
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Working temperature calculation of single-core cable by nonlinear finite element method
Autorzy:
Meng, Xiaokai
Han, Peijie
Liu, Yongxin
Lu, Zhumao
Jin, Tao
Powiązania:
https://bibliotekanauki.pl/articles/141018.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cable
finite element simulation model
thermal conductivity
operating temperature
Opis:
By simulating the actual working conditions of a cable, the temperature variation rule of different measuring points under different load currents was analyzed. On this basis, a three-dimensional finite element model (FEM) was established, and the difference and influence factors between the simulation temperature and the experimental measured value were discussed, then the influence of thermal conductivity on the operating temperature of the conductor layer was studied. Finally, combined with the steady-state thermal conductivity model and the experimental measured data, the relation between thermal conductivity and load current was obtained.
Źródło:
Archives of Electrical Engineering; 2019, 68, 3; 643-656
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Patient-specific finite element analysis of frictional behavior in different esophageal regions during endoscopy
Autorzy:
Lin, Chengxiong
Ren, Pan
Li, Wei
Deng, Hengyi
Zhou, Zhongrong
Powiązania:
https://bibliotekanauki.pl/articles/27324143.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
human esophagus
frictional behavior
finite element model
patient
przełyk człowieka
zachowanie cierne
model elementów skończonych
pacjent
Opis:
Endoscopy is a common and effective method to treat digestive system diseases. Not only can it detect the physiological state of the digestive tract, but also can conduct clinical operations. As a result, it’s of great significance to make clear the relationship between the clinical operation and the complications. Methods: Considering the difficulty in measuring the contact force and determining the stress distribution in real time during endoscopy, a specific-patient finite element model for the frictional behavior at the endoscope-esophagus interface was built in current study. By collecting the CT data of the patient, a 3D esophagus model was built and divided into three characteristic regions (narrow region, thoracic region and abdominal region) according to the physiological structure. Results: Results showed that the radius of the narrowest position was the dominant factor for the maximum von Mises stress when the endoscope passed through the narrow region. For abdominal region and thoracic region, with the increasing coefficient of friction (COF) and amplitude, the total force duo to frictional force (CFSM), frictional dissipation (FD), strain energy (SE) and maximum von Mises stress (Max) all increased correspondingly. Meanwhile, the region of stress concentration gradually approached the initial contact stage. Conclusions: The results can provide theoretical basis and technical support for clinical application and offer some suggestions for medical workers during endoscopy as well.
Źródło:
Acta of Bioengineering and Biomechanics; 2020, 22, 2; 11--24
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Konečno-èlementnaâ modelʹ èlektronno-lučevoj pajki tverdosplavnyh režuŝih èlementov k opravke
The finite element model for electron beam soldering of carbide cutting elements to a mandrel
Autorzy:
Goranskij, G.G.
Pobol, A.I
Powiązania:
https://bibliotekanauki.pl/articles/2068493.pdf
Data publikacji:
2020
Wydawca:
Politechnika Częstochowska
Tematy:
finite element model
electron beam processing
carbide tool
model elementów skończonych
obróbka wiązką elektronową
narzędzia z węglika
Opis:
Sozdany obobŝennye konečno-èlementnye (KÈ) modeli èlektronno-lučevoj obrabotki (ÈLO) poverhnostej dlâ materialov s suŝestvenno otličaûŝimisâ teplofizičeskimi svojstvami, pozvolâûŝie proizvoditʹ rasčet i optimizaciû režimov processa. Dlâ izdelij raznoj geometrii, učityvaâ termodinamiku processa i temperaturnye zavisimosti svojstv materialov, upravlââ geometriej èlektronnogo pučka i ciklogrammoj processa, optimizirovany diapazony ènergeti českih parametrov ÈLO. KÈ modelirovanie nagreva poverhnosti pri ÈLO provedeno dlâ detali ploskoj formy stacionarnym istočnikom so skaniruûŝej razvertkoj, a takže pri vozdejstvii v režime linejnogo peremeŝeniâ luča bez skaniruûŝej razvertki. Dlâ optimizacii èlektronno-lučevogo oplavleniâ pri pajke predložena termodinamičeskaâ KÈ modelʹ, učityvaûŝaâ geometričeskie osobennosti rezcovyh vstavok i teplofizičeskie svojstva sostavlâûŝih ih materialov. Pokazano, čto učet temperaturnoj zavisimosti teplofizičeskih svojstv materialov pozvolâet realizovyvatʹ shemy ÈLO s menʹšej prodolžitelʹnostʹû vozdejstviâ pučka bolʹšej moŝnosti.
Generalized finite-element models for the electron-beam treatment of the surface of materials with significantly different thermophysical properties have been created, allowing the calculation and optimization of process conditions. For products of different geometries, taking into account the thermodynamics of the process and the temperature dependences of the properties of materials, controlling the electron beam geometry and the process cycloramas, the ranges of energy parameters of electron beam processing have been optimized. Finite-element modeling of surface heating during electron-beam processing was carried out for a flatshaped part by a stationary source with scanning, as well as when exposed to linear beam movement without scanning. To optimize electron beam reflow during soldering, a thermodynamic finite-element model is proposed that takes into account the geometric features of the cutter inserts and the thermophysical properties of their constituent materials. It is shown that taking into account the temperature dependence of the thermophysical properties of the materials makes it possible to realize electron beam processing schemes with a shorter duration of exposure to a beam of greater power.
Źródło:
Zeszyty Naukowe Politechniki Częstochowskiej. Budownictwo; 2020, 26 (176); 44-55
0860-7214
Pojawia się w:
Zeszyty Naukowe Politechniki Częstochowskiej. Budownictwo
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 109

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