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Tytuł:
Theoretical analysis of the forging process for producing hollow balls
Autorzy:
Winiarski, G.
Powiązania:
https://bibliotekanauki.pl/articles/102269.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
die forging
hollow ball forging
FEM
Opis:
Hollow balls are used in the production of various machines and devices. The technology for producing hollow balls by metal forming technologies poses numerous difficulties connected with the forming of a hollow billet. The billet, which is usually in the form of a rod, is subject to such processes as forging, helical rolling or cross-wedge rolling. The paper discusses a new method and conditions for producing a hollow ball. It was assumed that the ball would be produced in two forging operations: an initial forging operation and finish forging operation. The presented results are based on the FEM numerical analysis conducted using DEFORM-3D. It was assumed that the billet material was made from AISI 304 stainless steel used to produce balls for ball valves. Both the shape progression during the forging process and variations in the forming force were analyzed. Based on the conducted analyses, it can be claimed that hollow balls can be produced using the proposed forging method.
Źródło:
Advances in Science and Technology. Research Journal; 2013, 7, 18; 68-73
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computer-aided analysis of a new process for flanging hollow parts
Autorzy:
Winiarski, G.
Powiązania:
https://bibliotekanauki.pl/articles/118231.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Promocji Wiedzy
Tematy:
flanging
hollow parts
Al-Mg-Si alloy
FEM
Opis:
The paper presents a new process for flanging hollow parts. This process is performed using a specially designed set of tools with movable sleeves. The principle of operation of the tool set is described and examples of the numerical analysis results are given. The FEM simulation was performed on the assumption that the hot-formed hollow workpiece (tube) is made of AlMgSi aluminum alloy. The obtained FEM results show changes in the workpiece shape during flanging, variations in the forming force and the damage function distribution computed according to the C-L failure criterion. The theoretical results of the new flanging method provided basis for experimental tests.
Źródło:
Applied Computer Science; 2014, 10, 1; 19-29
1895-3735
Pojawia się w:
Applied Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Execution and Inspection of Steel Hollow Sections Welded Joint
Autorzy:
Kuchta, K.
Silezin, R.
Żwirek, P.
Powiązania:
https://bibliotekanauki.pl/articles/104583.pdf
Data publikacji:
2018
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
steel structures
lattice structures
hollow section
welded joints
welds
Opis:
The hollow section welded joints require a number of actions before starting welding and appropriate supervision during this operation to achieve joints with adequate quality level, which should be confirmed by the post-completion tests. The execution of hollow section joints is associated not only with welding, but also with cutting and additional machining of edges. In some cases, weld surfacing is also applied to correct sections fit-up. Weld surfacing and thermal cutting can cause local hardening of connected elements. The welding has to be preceded by an assessment of the previous technological processes. The welded joints can be only executed on the basis of detailed Welding Procedure Specifications (WPS). It is advisable to manufacture - in accordance with previously prepared WPS - pre-production joints for testing, proving the ability of the welding personnel to execute welded joints with specified quality, using the available equipment. The quality of welded joints is proved by testing. A type of conducted tests, thus scope and type of welding defects possible to detect, depends on the weld type, wall thickness of connected elements and joint geometry. The authors’ experience indicates that the proper execution of the welded joint of hollow sections is difficult task, which often requires pre-production quality testing of the joints.
Źródło:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury; 2018, 65, 2; 69-80
2300-5130
2300-8903
Pojawia się w:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Technological Aspects of Execution of Welded Joints in Hollow Sections
Autorzy:
Kuchta, K.
Silezin, R.
Żwirek, P.
Powiązania:
https://bibliotekanauki.pl/articles/104810.pdf
Data publikacji:
2018
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
steel structures
lattice structures
welded joints
hollow section
Opis:
Steel structures designed according to Eurocode 3 are executed in accordance with the provisions of the standard PN-EN 1090-2, which is referred to in Eurocode 3. In addition, the standard PN-EN 1090-2 refers to in its content a number of welding standards, e.g. PN-EN ISO 9692-1. These standards provide guidelines for welded connections, which should be applied in the case of joints connecting steel hollow sections. Analysis of above-mentioned provisions revealed that for fillet welds they are simultaneously fulfilled only if the inclination angles of the elements are in the range of 70°-100°. According to recommendations of PN-EN 1993-1-8 and EN 1090-2, the same weld type around the perimeter of the element connected to the chord of lattice structure is possible to execute only for inclination angle lower than 60°. Discrepancies between these standards also exist with regard to the interpretation of the dimension of the flare groove welds in connections of rectangular hollow sections with the same width. In addition, analyses of the recommendations for welding in cold-formed zones indicate that, for steel grades currently used for the production of cold-formed rectangular hollow sections, welding in these zones is not permitted only for profiles with wall thickness equal to 12.5 and 16 mm. The above-mentioned issues point out the need for mutual unification of standards for the design and execution of steel joints in hollow sections.
Źródło:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury; 2018, 65, 2; 35-42
2300-5130
2300-8903
Pojawia się w:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Testing of undrained shear strength in a hollow cylinder apparatus
Autorzy:
Wrzesiński, G.
Lechowicz, Z.
Powiązania:
https://bibliotekanauki.pl/articles/178481.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
undrained shear strength
cohesive soils
principal stress directions
hollow cylinder tests
Opis:
The paper presents the results of tests performed in a Torsional Shear Hollow Cylinder Apparatus on undisturbed cohesive soils. The tests were performed on lightly overconsolidated clay (Cl) and sandy silty clay (sasiCl). The main objective of the tests was to determine the undrained shear strength at different angles of rotation of the principal stress directions. The results of laboratory tests allow assessing the influence of rotation of the principal stress directions on the value of undrained shear strength that should be used during designing structure foundations.
Źródło:
Studia Geotechnica et Mechanica; 2015, 37, 2; 69-73
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Utilization of peeler cores for producing beams with hollow cross-section
Autorzy:
Koynov, Daniel
Valyova, Miglena
Powiązania:
https://bibliotekanauki.pl/articles/2201365.pdf
Data publikacji:
2022
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
Tematy:
populus sp
hollow beams
small-diameter logs
veneer
engineered Wood
Opis:
This study presents an opportunity to utilize peeler cores derived from poplar wood for the production of hollow beams. In this way, final products to meet the needs of consumers can be obtained. The proposed novel methods for sawing and gluing the produced materials allow rational application of the waste raw material in the plywood manufacturing. Another advantage in this case is that products with a square cross-section with dimensions close to or corresponding to the standard ones are obtained from small-diameter round wood. The raw material used to receive the proposed hollow beams is up to 33% less than a conventional beam with the same dimensions. The manufactured products are lighter and with a significantly stable cross-sectional shape, compared to natural wood beams with the same dimensions. Sawing the peeler cores and obtaining materials with a triangular and trapezoidal cross-section helps to achieve volume yields from 60.6% to 71.1% of the raw material initial volume.
Źródło:
Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2022, 65, 210
1644-3985
Pojawia się w:
Drewno. Prace Naukowe. Doniesienia. Komunikaty
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Utilizing Hollow-Structured Bamboo as Natural Sound Absorber
Autorzy:
Putra, A.
Khair, F. A.
Nor, M. J. M.
Powiązania:
https://bibliotekanauki.pl/articles/177960.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bamboo
hollow structure
acoustic absorber
absorption coefficient
Opis:
Studies to find alternative low environmental-impact materials for acoustic absorbers are still progressing, particularly those originated from natural materials. However, most of the established works are mainly focused on the fibrous-type absorbers. Discussion on the non-fibrous-type absorbers is still lacking and this therefore becomes the objective of this paper. Use of bamboo by utilizing its hollow structure to absorb sound energy is discussed here. The normal incidence absorption coefficient was measured based on the length and diameter of the bamboo, as well as different arrangement of the bamboo structure subjected to the incidence sound, namely, axial, transverse, and crossed-transverse arrangements. The trend of absorption coefficient appears in peaks and dips at equally spacing frequencies. For all arrangements the peak of absorption can reach above 0.8. Introducing an air gap behind the bamboo shifts the peak absorption to lower frequency. Covering the front surface of the absorber improves the sound absorption coefficient for axial arrangement by widening the frequency range of absorption also towards lower frequency range. The transverse arrangement is found to have average absorption coefficient peaks of 0.7 above 1.5 kHz. By arranging the bamboo structure with crossed-transverse arrangement, the suppressed absorption peaks in normal transverse arrangement can be recovered.
Źródło:
Archives of Acoustics; 2015, 40, 4; 601-608
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical analysis of rolling extrusion process of a hollow hub
Analiza numeryczna procesu przepychania obrotowego piasty drążonej
Autorzy:
Bartnicki, J.
Powiązania:
https://bibliotekanauki.pl/articles/356203.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
rolling-extrusion
FEM
hollow products
Opis:
This paper presents the results of numerical calculations of rolling extrusion process of a hollow hub. Simulations were made by means of software Deform 3D in three dimensional state of strain. Distributions of effective stress, effective strain and damage criterion in the rolled extruded product were analyzed. Verification of metal flow during process allowed to design tools for experimental verification in PO-2 laboratory rolling - extrusion aggregate. For these needs also process force parameters were calculated.
W pracy przedstawiono rezultaty obliczeń numerycznych procesu przepychania obrotowego piasty drążonej. Symulacje wykonano w przestrzennym stanie odkształcenia korzystając z oprogramowania Deform 3D. Analizie numerycznej poddano, występujące w przepychanym obrotowo wyrobie, rozkłady naprężeń, odkształceń oraz kryterium pękania. Określenie kierunków płynięcia metalu podczas kształtowania umożliwiło zaprojektowanie narzędzi przeznaczonych do weryfikacji eksperymentalnej procesu w agregacie do przepychania obrotowego PO-2. W tym celu oszacowano także parametry siłowe procesu.
Źródło:
Archives of Metallurgy and Materials; 2012, 57, 4; 1138-1142
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical and experimental analysis of rotary compression of ball pins hollow forgings
Autorzy:
Tomczak, J.
Bulzak, T.
Pater, Z.
Powiązania:
https://bibliotekanauki.pl/articles/102116.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
hollow ball pins
rotary compression
experiment
FEM
Opis:
This paper presents the chosen results of ball pins hollow forgings forming by means of rotary compression. Theoretical research was based on numerical simulations, conducted using finite element method. The software Simufact was applied for calculations needs. During simulations, kinematics of material flow, strain intensity distribution, damage criterion according to Cockroft-Latham and temperature distributions were determined. Force parameters in the process were also determined and limiting phenomena were identified. Results from FEM modeling were verified in laboratory conditions. Ball pins hollow forgings forming tests were performed in a special forge aggregate. The obtained results fully confirmed the possibility of ball pins hollow forgings manufacturing by means of rotary compression.
Źródło:
Advances in Science and Technology. Research Journal; 2016, 10, 32; 109-117
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie ładunków kumulacyjnych do perforacji odwiertów geologicznych
Application of hollow charges for geological wells perforation
Autorzy:
Wilk, Z.
Zygmunt, B.
Powiązania:
https://bibliotekanauki.pl/articles/210134.pdf
Data publikacji:
2007
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
ładunki kumulacyjne
materiały wybuchowe — zastosowania
hollow charge
explosives — applications
Opis:
W pracy zaprezentowano charakterystykę wyrobów przeznaczonych dla prac strzałowych w otworach wiertniczych wykorzystujących ukierunkowane działanie materiałów wybuchowych. Przedstawiono przykłady nowych krajowych konstrukcji ładunków kumulacyjnych do perforacji odwiertów z zastosowaniem nowoczesnych technologii produkcji wkładek kumulacyjnych o wysokich gęstościach prasowanych z proszków metali oraz wysokoenergetycznych materiałów wybuchowych zawierających fluoropolimery do prasowania ładunków o wysokiej gęstości.
Short history of the development of geological wells perforation techniques has been described. The paper focused on the construction and features of shaped charges used for perforation. The achievements of Polish R&D institutions are reviewed.
Źródło:
Biuletyn Wojskowej Akademii Technicznej; 2007, 56, 1; 245-258
1234-5865
Pojawia się w:
Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reinforcement of cracked hollow-core slabs during the construction of the building
Autorzy:
Szeląg, Romuald
Powiązania:
https://bibliotekanauki.pl/articles/2172410.pdf
Data publikacji:
2022
Wydawca:
Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.
Tematy:
hollow-core slabs
scratches
cracks
damage
reinforcements
płyta kanałowa
zadrapanie
pęknięcie
szkoda
wzmocnienie
Opis:
During the implementation of investment processes with the use of ready-made prefabricated elements, undesirable situations may occur that cause scratches, excessive deflections or damage. This is due to the fact that defects occur during transport, storage or incorrect loading of the elements. The conducted tests and technical assessments often allow the use of built-in elements, however, under the conditions of the need to make their reinforcements. This may be due to the scale of damage or defects made during molding and, as a consequence, the implementation of prefabricated elements with too low load capacity. Taking action each time should allow for the implementation of reinforcements of the elements, limiting the need to dismantle them, which would result in their irretrievable destruction. The implementation of reinforcements allows to reduce the generation of waste from new elements and allows for the proper management of already produced prefabricated elements. Used elements with reinforcements should be subject to technical inspection in the same periods as other structural elements. Proper implementation of repairs allows for the final effect to be similar to the parameters of elements free of technical defects. Due to the existing problem of damage to new elements of prefabricated channel ceilings, solutions have been developed that can be used to reinforce the elements without the need to dismantle them from the places of installation, while reducing the time spent on the process.
Źródło:
Inżynieria Bezpieczeństwa Obiektów Antropogenicznych; 2022, 4; 54--62
2450-1859
2450-8721
Pojawia się w:
Inżynieria Bezpieczeństwa Obiektów Antropogenicznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Propagation properties of anomalous hollow vortex beam in uniaxial crystal orthogonal to the optical axis
Autorzy:
Liu, D.
Wang, Y.
Wang, G.
Powiązania:
https://bibliotekanauki.pl/articles/174466.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
uniaxial crystal
anomalous hollow vortex beam
laser propagation
Opis:
The analytical equation of an anomalous hollow vortex beam propagating in a uniaxial crystal orthogonal to the optical axis is derived, and the intensity and phase properties of this beam propagating in the uniaxial crystal are illustrated using numerical examples. The influences of topological charge M and the ratio of refractive index ne/no of a uniaxial crystal on the normalized intensity distribution and phase distribution for anomalous hollow vortex beam are discussed and analyzed in detail.
Źródło:
Optica Applicata; 2018, 48, 1; 95-104
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determining of Maximum Stress in Circular and Circular Hollow Rod by Measurement of Strains
Autorzy:
LABAŠ, Vladimír
ĎURIŠ, Rastislav
LABAŠOVÁ, Eva
Powiązania:
https://bibliotekanauki.pl/articles/456446.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Rzeszowski
Tematy:
shear stress
circular rod
hollow circular rod
measurement system
Opis:
The contribution deals with determining of stress from measured values of strains. Gauge strains, which were linked in half-bridge, and the universal measurement system QuantumX MX840 were used to experimentally obtain the strains. Rods with circular section and hollow circular section serve as tests samples. Students within the educational process will have the opportunity to acquaint with the universal measuring system and see the interconnectedness of theory and practical application.
Źródło:
Edukacja-Technika-Informatyka; 2015, 6, 2; 173-178
2080-9069
Pojawia się w:
Edukacja-Technika-Informatyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Average intensity of a partially coherent anomalous hollow beam propagating in underwater oceanic turbulence
Autorzy:
Liu, Dajun
Wang, Guiqiu
Zhong, Haiyang
Yin, Hongming
Wang, Yaochuan
Powiązania:
https://bibliotekanauki.pl/articles/175102.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
oceanic turbulence
average intensity
anomalous hollow beam
Opis:
Based on the extended Huygens–Fresnel principle, the cross-spectral density function of a partially coherent anomalous hollow beam (AHB) propagating in underwater oceanic turbulence has been derived. The average intensity of partially coherent AHB propagating in underwater oceanic turbulence has been calculated. The influences of coherence length and the strength of underwater oceanic turbulence on the spreading properties of partially coherent AHB are illustrated and analyzed using numerical examples. It is found that the partially coherent AHB with smaller coherence length and the partially coherent AHB propagating in stronger underwater oceanic turbulence will lose the initial beam profile and evolve into the Gaussian beam faster. The results are useful in applications for underwater wireless optical communication.
Źródło:
Optica Applicata; 2019, 49, 2; 227-239
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical investigation of the turbulent flow generated with a radial Turbine using a converging hollow blade
Autorzy:
Beloudane, M.
Bouzit, M.
Ameur, H.
Powiązania:
https://bibliotekanauki.pl/articles/778815.pdf
Data publikacji:
2018
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
converging hollow
deep
radial flow
turbulent flow
stirred tank
Opis:
The aim of this study is to investigate the effect of the blade shape on the characteristic of the flow patterns in a stirred tank. A new impeller blade design has been proposed. It is characterized by a converging hollow. The investigations of the flow structure generated in the vessel are made by using the computer code ANSYS CFX (version 16.0). The analysis has shown that the converging hollow blade yields highly radial flows which gave an increase in the radial velocity by 35% with less power consumption than the flat blade. Also, the effectiveness of the energy dissipation and the quality of mixing has been obviously noted. A validation test of our predicted results with other literature data was done, and a satisfactory agreement has been found.
Źródło:
Polish Journal of Chemical Technology; 2018, 20, 4; 129-137
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The kurtosis parameter of partially coherent controllable dark hollow beams in free space
Autorzy:
Li, J.
Wang, W W
Lai, Y
Powiązania:
https://bibliotekanauki.pl/articles/173815.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
kurtosis parameter
partially coherent controllable dark hollow beams
free space
Opis:
Based on the extended Huygens–Fresnel principle and the definition of second-order moments of the Wigner distribution function, the analytical expression for the kurtosis parameter of partially coherent controllable dark hollow beams in free space is derived, and used to study the influence of beam parameters on the kurtosis parameter. It is shown that the kurtosis parameter increases with increasing the wavelength and the waist width, or decreasing the scaling factor, however, the effect of the beam order and the spatial correlation length on the kurtosis parameter depends on the propagation distance. The results can be interpreted physically.
Źródło:
Optica Applicata; 2014, 44, 4; 533-543
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental study of an anomalous hollow beam with orbital angular momentum
Autorzy:
Lu, Xingyuan
Zhao, Chengliang
Hoenders, Bernhard J.
Yang, Yuanjie
Cai, Yangjian
Powiązania:
https://bibliotekanauki.pl/articles/173518.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
anomalous hollow beam
orbital angular momentum
focused intensity
Fourier transform
Opis:
Anomalous hollow beam has potential applications in the optical trapping and free space optical communications, etc. It is noted that, thus far, although a large number of studies have been carried out in this field, most of them are theoretical studies and only quite a few cases have experimental results. Here, we experimentally study the generating of anomalous hollow beam carrying orbital angular momentum, and measure its topological charge. We show that the number of dark rings in the Fourier transform of intensity patterns is equal to the topological charge. The experimental results agree well with the simulations.
Źródło:
Optica Applicata; 2019, 49, 2; 217-226
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Hollow Fiber Supported Liquid Membrane for Extraction of Cobalt by Cyanex 272
Autorzy:
Swain, Basudev
Lee, Jae-Chun
Kim, Dae-Guen
Lee, Chan Gi
Powiązania:
https://bibliotekanauki.pl/articles/354650.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Cyanex 272
hollow fiber supported
cobalt recovery
Opis:
Considering the advantages of hollow fiber supported liquid membrane (HFSLM), it has been applied for extraction of Co(II) with a motivation to extract cobalt from various waste resources. Extraction efficiency and transport behavior of Co(II) through HFSLM containing Cyanex 272 diluted in kerosene were investigated. Experiments were performed as a function of aqueous feed solution velocity (1000 mL/min) for both feed and strip, pH of feed solution in the range of 4.00-6.75, the carrier concentration of 25-1000 mol/m3, and acid concentration in strip solution of 1-500 mol/m3 on. The mass transfer rate or flux J Co(II), which is a function of metal concentration, volume of solution, and membrane area were analyzed. The optimum condition for extraction of Co(II) was pH of 6.00, Cyanex 272 concentration of 500 mol/m3 and H2 SO4 concentration of 100 mol/m3.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 3; 845-850
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical analysis of three-stage the forming process hollow forgings with an outer flange
Autorzy:
Wójcik, Łukasz
Bulzak, Tomasz
Winiarski, Grzegorz
Szala, Mirosław
Powiązania:
https://bibliotekanauki.pl/articles/135267.pdf
Data publikacji:
2020
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
forging
extrusion
radial forging
hollow part
stepped shaft
flanging
Opis:
This article presents the results of computer simulations used to investigate the forming of a hollow coldworked forging with an outer flange. Numerical simulations were performed in Deform 2D/3D using a calculation module for axial-symmetric cases. A ϕ57×12.5 mm tube-shaped billet from 42CrMo4 grade steel was used. The forming process involved two and three stages, consisting of extrusion the shaft portion and forging the flange. The objective of this research was to determine the accuracy of the forming process used to produce the hollow part. This technology was analyzed using the effective strain distributions, the Cockcroft-Latham fracture criterion values, and the forming force progression. The results showed that it was possible to use this three-stage process to forge elements from a tube-shaped billet.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2020, 62 (134); 142-147
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hollow fibre membrane oscillations against fouling process – a numerical study
Autorzy:
Gac, J.M.
Gradoń, L.
Powiązania:
https://bibliotekanauki.pl/articles/185667.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hollow fibre membrane
fouling
numerical modelling
DLVO model
membrana z włókna
zanieczyszczenie
modelowanie numeryczne
model DLVO
Opis:
The modelling of colloidal fouling and defouling of hollow fibre membranes in the presence of membrane oscillations is analysed by means of numerical simulations as an effect of complex coupling between hydrodynamic and surface forces. To describe the latter the Derjaguin-Landau-Vervey-Overbeek (DLVO) model has been employed. We have investigated the influence of various parameters of the process like flow rate, mean particle diameter, amplitude and frequency of the oscillations, and others, on the efficiency of the defouling process. The investigated parameters is close to that of a silica suspension in , a typical system modelling used to investigate membranę separation. On the basis of numerical simulation resu lts e have defined an optimal set of parameters preventing membrane fouling.
Źródło:
Chemical and Process Engineering; 2014, 35, 1; 149-158
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Focusing properties of partially coherent dark hollow Gaussian beams through a thin lens system
Autorzy:
Dong, Y
Zhao, C
Wang, K
Cai, Y
Powiązania:
https://bibliotekanauki.pl/articles/175075.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
focusing properties
partially coherent
dark hollow beam
focal shift
Opis:
This paper investigated the focal shift of partially coherent dark hollow Gaussian beams through a thin lens system. An analytic expression of the irradiance distribution of the focusing partially coherent dark hollow Gaussian beams in the back focal plane has been given by using the Collins formula. The focus shift of focused partially coherent dark hollow Gaussian beams in different parameters is studied in detail by numerical calculations. It is found that the absolute value of the focal shift of partially coherent dark hollow Gaussian beams decreases as the transverse coherence width or the order of the dark hollow Gaussian beams or a parameter of the dark hollow Gaussian beams increases.
Źródło:
Optica Applicata; 2015, 45, 2; 151-161
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An analytical investigation of a 2D-PPMs hollow infinite cylinder under thermo-electro-mechanical (TEM) loadings
Autorzy:
Meshkini, M.
Firoozbakhsh, K.
Jabbari, M.
SelkGhafari, A.
Powiązania:
https://bibliotekanauki.pl/articles/279772.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
piezoelectric
porothermoelastisity
2D-PPMs
hollow cylinder
TEM
Opis:
The analytical solution of steady-state asymmetric thermo-electro-mechanical loads of a hollow thick infinite cylinder made of porous piezoelectric materials (2D-PPMs) based on two-dimensional equations of thermoelasticity is considered. The general form of thermal and mechanical boundary conditions is considered on the inside and outside surfaces. A direct method is used to solve the heat conduction equation and the non-homogenous system of partial differential Navier equations using the complex Fourier series and the powerexponential law functions method. The material properties are assumed to depend on the radial and circumferential variable and are expressed as power-exponential law functions along the radial and circumferential direction.
Źródło:
Journal of Theoretical and Applied Mechanics; 2018, 56, 1; 107-122
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical analysis of a forging process for producing a hollow ball from tube
Autorzy:
Samołyk, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/102575.pdf
Data publikacji:
2018
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
hollow ball
die forging
cold forming
19MnCr5 steel
wydrążona kula
matrycowanie
formowanie na zimno
stal 19MnCr5
Opis:
The paper presents the results of a numerical analysis (by FEM) of a new forging process for producing a hollow ball with an outside diameter of 30 mm and a wall thickness of 4.4 mm. It was assumed that the ball forging would be cold formed from hollow billet (tube) made of 19MnCr5 steel. The effect of billet dimensions (diameter, height and wall thickness) on the forming process was investigated, which led to identification of basic shape defects and determination of the billet dimensions required for producing balls of the desired geometry. The ball forming conditions, including force parameters of the process, are thoroughly investigated.
Źródło:
Advances in Science and Technology. Research Journal; 2018, 12, 3; 150-157
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of hollow section overlap joints with reinforcing rib plate. Joint resistance
Autorzy:
Bródka, J.
Powiązania:
https://bibliotekanauki.pl/articles/230435.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
konstrukcja stalowa
kształtownik zamknięty
żebro wzmacniające
odporność
ocena
połączenie nakładkowe
steel structure
hollow section
reinforcing rib
resistance
assessment
overlap joint
Opis:
These joints are used when the designer and contractor anticipate difficulties during the construction of overlap joints. They were not included in the PN EN 1993-1-8 in full scale. Resistance assessment of such joints is presented in accordance with standard rules. The results were compared with the experimental studies carried out at the “Mostostal” Centre; while the former research activities and the legitimacy of the proposed method of assessing the resistance of these joints was confirmed. This is an example of an overlap joint calculation.
Źródło:
Archives of Civil Engineering; 2015, 61, 1; 3-16
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-25 z 151

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