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Wyświetlanie 1-10 z 14
Tytuł:
The Influence of Material Model of the Polyurethane Elastomer on the FEM Calculations Quality for the Various Modes of Loading
Autorzy:
Kut, S.
Ryzińska, G.
Niedziałek, B.
Powiązania:
https://bibliotekanauki.pl/articles/352180.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
elastomers
material tests
material models
FEM simulation
experiment
Opis:
The paper presents research to verify the effectiveness of nine selected material models of elastomeric materials based on uniaxial tension test. Basing on the cyclic uniaxial tension test of elastomers sample, the stress-strain characteristic for the 18th load cycle was prepared. On the basis of the obtained characteristic, the values of material constants were calculated for the studied models (Neo-Hookean, Mooney with two and three constants, Signorini, Yeoh, Ogden, Arruda-Boyce, Gent and Marlow) and simulation of tensile, upsetting and bending processes was performed with the usage of the software MARC/Mentat. The effectiveness of the selected models was determined based on a comparison of results obtained in the experimental tensile test, upsetting test and bending test of an elastomeric samples with the results of numerical FEM calculations for each models. The research has shown that, for modeling of the elastomeric cylinder upsetting in the range of deformation of 62%, the best results with the comparison of the experiment were obtained by using the Yeoh model. In the bending process none of the analyzed models indicate a high convergence of results from an experiment. Analyzing the characteristics of the experimental and numerical tensile test it can be seen that in the entire range of punch movement (0 to 55 mm), models Signorini, Marlow, Ogden(N3) and Mooney(3) give the best results.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2A; 523-530
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Processes simulations with multiscale materials models using a dedicated interface
Autorzy:
Smyk, Grzegorz
Szeliga, Danuta
Powiązania:
https://bibliotekanauki.pl/articles/29520085.pdf
Data publikacji:
2021
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
multiscale modelling
material models
model integration
recrystallization
Opis:
The main goal of this work is the integration of in-house software with commercial numerical software based on the finite element method (FEM). The main idea is to develop a universal interface to perform process simulations with multiscale models. The interface allows the combination of external procedures with commercial software with minimum programmer’s work putting in integration. As an example, the model of material recrystallization of steel was implemented, added to the commercial application, and the software was tested for a process defined as a sequence of compression and cooling. The material model takes into consideration each type of recrystallization that occurs during a sequence of thermal and mechanical processing such as static recrystallization (SRX), dynamic recrystallization (DRX), and meta-dynamic recrystallization (MDRX). It allows the prediction of recrystallized volume fraction (X) and grain growth on each step of numerical simulation for each Gauss point in the computation domain. The presented multiscale model of process sequences not only allows to calculate microscale model parameters such as grain growth and recrystallized volume fraction, but also reflects the impact of the microscale model on macroscale parameters.
Źródło:
Computer Methods in Materials Science; 2021, 21, 4; 181-192
2720-4081
2720-3948
Pojawia się w:
Computer Methods in Materials Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modele materiałowe wybranych gatunków stali stosowanych na odrzwia obudowy wyrobisk korytarzowych
Material models of selected types of steel used for double timber of mine roadways
Autorzy:
Szot, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/164797.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Górnictwa
Tematy:
kształtowniki stalowe
zginanie
obliczenia numeryczne
modele materiałowe
steel sections
bending
numerical calculation
material models
Opis:
W artykule zaprezentowano wyniki kalibracji modeli materiałowych stali gatunków 25G2, S480W oraz S550W, w oparciu o porównanie wyników przeprowadzonych obliczeń numerycznych metodą elementów skończonych z wynikami badań stanowiskowych statycznej próby zginania kształtowników typu V. Modele te opracowano w oparciu o rzeczywiste charakterystyki materiałowe ww. gatunków stali, uzyskane na podstawie badań stanowiskowych przeprowadzonych w ramach pracy statutowej pt. „Modele materiałowe wybranych gatunków stali, stosowanych na odrzwia obudowy wyrobisk korytarzowych”, realizowanej w Głównym Instytucie Górnictwa w latach 2013-2014.
This paper presents the results of material model calibration of steel type 25G2, S480W and S550W, based on a comparison of the results of numerical calculations using the finite element method with the results of bench tests of static bending tests conducted on V sections. The models were developed on the basis of the actual material characteristics of the above-mentioned steel types, obtained through tests carried out as a part of a project titled: “Material models of selected types of steel used for double timber of mine roadways” carried out in the Central Mining Institute between 2013 and 2014.
Źródło:
Przegląd Górniczy; 2016, 72, 7; 70-77
0033-216X
Pojawia się w:
Przegląd Górniczy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical modelling of behaviour of surface finishing of composite materials
Autorzy:
Vosáhlo, Josef
Syrovátková, Martina
Petrů, Michal
Powiązania:
https://bibliotekanauki.pl/articles/102767.pdf
Data publikacji:
2018
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
surface finishing
gravel
composite
material models
FEM model
wykończenie powierzchni
żwir
kompozyt
modele materiałowe
model MES
Opis:
The article describes and compares the course of the resistance test of a treated surface against the impact of gravel with the model of the test process. The two series of composite samples with surface treatment underwent a so-called gravel test, followed by the evaluation of the test results. Simultaneously with the tests, the material models of the tested composites were created. The input values obtained were used to create a FEM model. The model describes the response of the surface treatment to the impact of the object i.e. gravel of the given size and weight/number. The modelling results were compared with the results of real tests.
Źródło:
Advances in Science and Technology. Research Journal; 2018, 12, 1; 48-53
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Axial vibration of bars using fractional viscoelastic material models
Autorzy:
Łabędzki, P.
Pawlikowski, R.
Radowicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/127834.pdf
Data publikacji:
2018
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
fractional calculus
fractional viscoelastic material models
vibration of continuous system
pochodna ułamkowa
modele materiałów lepkosprężystych
drgania układów ciągłych
Opis:
This paper presents dynamic analysis of a bar with one end fixed and other free, loaded with force at its free end. The viscoelastic material of the bar is described by fractional models (Scot-Blair, Voigt, Maxwell and Zener models). Rayleigh-Ritz and Laplace transform methods were applied to obtain closed-form solution of the considered problem.
Źródło:
Vibrations in Physical Systems; 2018, 29; 1-8
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selection of material model of chosen photocurable resin for application in finite element analyses
Autorzy:
Miedzińska, Danuta
Powiązania:
https://bibliotekanauki.pl/articles/1835546.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
additive manufacturing
photocurable material
Finite Element Method
constitutive models
Opis:
In the paper, a literature study of a modelling methods of a photocurable materials developed by additive techniques is presented. The main aim was to assess which material model is appropriate for such kinds of matter. The Finite Element Method and the LS Dyna software was assumed as a possible environment for the investigations. The material models that can be apply for photopolymers analysing were described as well as examples of such materials. The conclusions is that the material model selection must be based on the observation of the material behaviour and the possible loading conditions (e.g. strain rate).
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2020, nr 23(4); 323-336
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Different Approaches to Research on the Interactions Between Hunter-gatherers and Groups of Farmers and Breeders
Autorzy:
Cetwińska, Aleksandra
Powiązania:
https://bibliotekanauki.pl/articles/1774260.pdf
Data publikacji:
2021-06-24
Wydawca:
Uniwersytet Warszawski. Wydawnictwa Uniwersytetu Warszawskiego
Tematy:
hunter-gatherers
farmers and breeders
theories and models
material studies
archaeometry
Europe
Opis:
Interactions between hunter-gatherers and groups of farmers and breeders have been a subject of archaeological debate for many years. Thanks to the application of different scientific approaches, ranging from material studies to archaeometric analyses, the discussion has not lost its relevance. The aim of this study is to present the evolution of scientific investigations related to these interactions and to emphasise the potential of the debate: despite the passing of time, it remains an open research issue. The complexity of this discussion will be demonstrated through selected case studies from all around Europe.
Źródło:
Światowit; 2020, 59; 79-87
0082-044X
Pojawia się w:
Światowit
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of polymer impression masses for the obtaining of dental working models for the stereolithographic 3D printing
Autorzy:
Dobrzański, L. B.
Achtelik-Franczak, A.
Dobrzańska, J.
Pietrucha, P.
Powiązania:
https://bibliotekanauki.pl/articles/378584.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
polyvinyl siloxane impression material
alignate impression material
CAD/CAM in dentistry
digital prosthetic working models
materiał wyciskowy poliwinylosiloksanowy
materiał wyciskowy alginianowy
CAD/CAM w stomatologii
Opis:
Purpose: The aim of the work is to execute measurements of digital dental models taken by scanning prosthetic impressions using the engineering CAD software and finding dimensional differences and scale factor for precise reproduction of patient tooth dimensions. Design/methodology/approach: Tests were carried out involving the execution of 3 series of impressions for selected impression materials, which were then scanned using two types of prosthetic scanners. Gypsum models based on mentioned impressions were scanned and dimensionally compared with impression-based digital models. Benchmark impressions were also performed in order to verify the obtained results and determine the correction factor for dimensions. The dimensional differences between impression groups were calculated by using Engineering CAD software. Findings: It was found, that compared to the base model, the digital model has a smaller volume than the object being mapped, the digital models based directly on the impression should be 0.09 - 0.12% rescaled to match the dimensions of the base model. Research limitations/implications: It is necessary to perform a practical verification of the results achieved and apply the determined coefficient in practice by creating working models using precise devices such as a 3D SLA printer and verify their results with intraoral scanner based models. Practical implications: This test will allow making precise working models using a 3D printer, allowing finally to perform, for example, implant-based bridges directly from the level of implants, using the masses described in the study. Originality/value: The comparative studies of polyvinyl siloxane and alignate impression materials were carried out in order to measure dimensional differences between working models made directly from the impression and gypsum models and compared with pattern, which allowed to determine the expansion coefficient, which will allow to work in 3D printing technology with close representation of real situation in the patient's oral cavity, which is particularly important when performing full arch bridges and extensive work on implants, including direct implants. The work has practical applications for both dental engineers and dentists performing advanced prosthetic work.
Źródło:
Archives of Materials Science and Engineering; 2019, 95, 1; 31-40
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic Characterization and Constitutive Modelling of ARMSTAL 500 Steel
Autorzy:
Tria, D. E.
Trębiński, R.
Powiązania:
https://bibliotekanauki.pl/articles/403943.pdf
Data publikacji:
2015
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
Johnson-Cook strength model
damage models
Split Hopkinson Pressure bar
material tests
LS DYNA Explicit
Opis:
The behaviour of a high strength steel (ARMSTAL 500) has been investigated using a combination of quasistatic and dynamic tests for a wide strain-rate range 1·10⁻⁴ – 3·10³ s⁻¹. A uniaxial testing machine and a Split Hopkinson Pressure Bar (SHPB) have been used under well controlled testing conditions. Next, the effect of the strain hardening, the strain rate hardening, loading history and stress triaxiality on the strength and ductility of the material has been studied. The present work also describes constitutive and damage models and their implementation available in the nonlinear finite element code LS DYNA. Calibration of constitutive model parameters and damage criteria is most often accomplished via regression techniques applied to laboratory data. A 3D numerical simulation of perforation of ARMSTAL 500 plates with 7.62 × 51 mm AP projectile were carried out with detailed models of target and compared with experiment in order to validate the calibrated models. As it will be shown, ARMSTAL 500 steel is a high strength steel with modest strain-rate sensitivity. The study indicates that the penetration depth can be predicted quantitatively and qualitatively with MJC hardening parameters calibrated from compression tests. The Modified Johnson–Cook constitutive model with Cockcroft and Latham failure model can predict the projectile residual speed and the fragmentation process followed very closely by MJC failure criteria.
Źródło:
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2015, 6, 3 (21); 19-40
2081-5891
Pojawia się w:
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ochrona budynków murowanych na terenie górniczym. Część 1 – rozważania teoretyczne
Protection of masonry buildings in the mining area. Part 1 – theoretical discussion
Autorzy:
Fedorowicz, J.
Mrozek, M.
Mrozek, D.
Powiązania:
https://bibliotekanauki.pl/articles/164277.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Inżynierów i Techników Górnictwa
Tematy:
tereny górnicze
ochrona obiektów budowlanych na terenach górniczych
analiza numeryczna
modele nieliniowe z degradacją
mining areas
protection of built features in mining areas
numerical analysis
models of inelastic material degradation
Opis:
W pracy omówiono zasady ochrony istniejącej zabudowy terenu górniczego nieprzystosowanej do przenoszenia wpływów eksploatacji górniczej. W części 1 pracy omówiono skutki eksploatacji ujawniające się na powierzchni terenu, omówiono również w skrócie zasady postępowania oraz metodykę przeprowadzania analizy statycznej budynków o konstrukcji ścianowej, zlokalizowanych w obrębie czynnego obszaru górniczego oraz metodykę i możliwości postępowania w przypadku wykorzystywania do analiz statycznych jako narzędzia metody elementów skończonych.
This paper presents the protection principles of the existing building development which is not adapted to carry the impacts of mining exploitation. Part 1 describes the influence of mining on subsoil surface, the principles of procedure and methodology for the static analysis of wall structures located within the active mining area as well as the methodology and capabilities for proceeding with static analysis, as a tool for the Finite Element Method .
Źródło:
Przegląd Górniczy; 2014, 70, 8; 85-92
0033-216X
Pojawia się w:
Przegląd Górniczy
Dostawca treści:
Biblioteka Nauki
Artykuł
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