Temat: material models - Prolib Integro

Skocz do pozycji: 1.

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.
Tematy:: elastomers
material tests
material models
FEM simulation
experiment; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/352180.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Processes simulations with multiscale materials models using a dedicated interface
Autorzy:: Smyk, Grzegorz
Szeliga, Danuta
Tematy:: multiscale modelling
material models
model integration
recrystallization; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Powiązania:: https://bibliotekanauki.pl/articles/29520085.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

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.
Tematy:: kształtowniki stalowe
zginanie
obliczenia numeryczne
modele materiałowe
steel sections
bending
numerical calculation
material models; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Górnictwa
Powiązania:: https://bibliotekanauki.pl/articles/164797.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Numerical modelling of behaviour of surface finishing of composite materials
Autorzy:: Vosáhlo, Josef
Syrovátková, Martina
Petrů, Michal
Tematy:: surface finishing
gravel
composite
material models
FEM model
wykończenie powierzchni
żwir
kompozyt
modele materiałowe
model MES; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/102767.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Axial vibration of bars using fractional viscoelastic material models
Autorzy:: Łabędzki, P.
Pawlikowski, R.
Radowicz, A.
Tematy:: fractional calculus
fractional viscoelastic material models
vibration of continuous system
pochodna ułamkowa
modele materiałów lepkosprężystych
drgania układów ciągłych; Pokaż więcej
Wydawca:: Politechnika Poznańska. Instytut Mechaniki Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/127834.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: MOTYWOWANIE PRACOWNIKÓW
Motivating employees
Autorzy:: Kołodziejczyk, Marzena
Opis:: The work discusses the most interesting issues concerning motivating employees i.e. the motivational function of a manager, the techniques of influencing employees, employees’ participation, employees’ values and needs, material and non-material motivating tools as well as the motivational function of payment.The work is divided into two parts. The first part, the theoretical one, discusses the above mentioned topics and in the introduction one can find topics connected with the history of motivation. This part includes theories and models of motivation and an attempt has been undertaken to define the subject of “motivation” and the systems of motivation. The part ends with some thoughts about the currently occurring problem of motivation in the times of economic crisis.The second part is a practical one, mainly a survey ran in a group of working respondents, which was aimed at confirming the hypotheses made. The survey concerns motivation in a given company.
W pracy zostały poruszone najciekawsze zagadnienia z zakresu motywowania pracowników, a mianowicie: motywacyjna funkcja kierownika, techniki wywierania wpływu na pracowników, partycypacja pracowników, wartości i potrzeby pracowników, narzędzia motywowania materialne i niematerialne, motywacyjna funkcja wynagrodzeń.Praca podzielona jest na dwie części. Pierwsza teoretyczna, która traktuje o w/w tematach, a wprowadzenie do pracy stanowią tematy mówiące o historii motywacji. Omówione w tym fragmencie zostały teorie i modele motywacji, podjęto próbę zdefiniowania pojęcia motywowania i systemów motywacji. Część ta zakończona jest rozważaniami na temat problemu obecnie nas dotyczącego – motywacji w czasach kryzysu.Druga część to praktyczny element pracy, a mianowicie badanie ankietowe, przeprowadzone w śród pracującej grupy respondentów, które ma na celu potwierdzenie postawionych hipotez. Badanie dotyczy motywacji w zakładzie pracy.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Inne

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Skocz do pozycji: 7.

Tytuł:: Selection of material model of chosen photocurable resin for application in finite element analyses
Autorzy:: Miedzińska, Danuta
Tematy:: additive manufacturing
photocurable material
Finite Element Method
constitutive models; Pokaż więcej
Wydawca:: Uniwersytet Warmińsko-Mazurski w Olsztynie
Powiązania:: https://bibliotekanauki.pl/articles/1835546.pdf Link otwiera się w nowym oknie
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).
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Different Approaches to Research on the Interactions Between Hunter-gatherers and Groups of Farmers and Breeders
Autorzy:: Cetwińska, Aleksandra
Tematy:: hunter-gatherers
farmers and breeders
theories and models
material studies
archaeometry
Europe; Pokaż więcej
Wydawca:: Uniwersytet Warszawski. Wydawnictwa Uniwersytetu Warszawskiego
Powiązania:: https://bibliotekanauki.pl/articles/1774260.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

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.
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; Pokaż więcej
Wydawca:: Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Powiązania:: https://bibliotekanauki.pl/articles/378584.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Dynamic Characterization and Constitutive Modelling of ARMSTAL 500 Steel
Autorzy:: Tria, D. E.
Trębiński, R.
Tematy:: Johnson-Cook strength model
damage models
Split Hopkinson Pressure bar
material tests
LS DYNA Explicit; Pokaż więcej
Wydawca:: Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Powiązania:: https://bibliotekanauki.pl/articles/403943.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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