Temat: numerical modeling stress - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Numerical analysis of stress and strain occuring in the contact area of ceramic head - ceramic cup in the hip endoprostheses
Autorzy:: Sobociński, M.
Powiązania:: https://bibliotekanauki.pl/articles/122522.pdf
Data publikacji:: 2013
Wydawca:: Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:: endoprosthesis of hip joint
numerical modeling stress
strain Weibull’s model
model naprężenia Weibulla
modelowanie numeryczne odkształceń
Opis:: The paper presents the results of numerical analysis of the system “ceramic head - ceramic cup” in the hip joint endoprosthesis. Applying the Al2O3 ceramics in this kind of solutions, apart from all values of this material, can lead to grinding, if a high load is used. The analysis was run on the ADINA system. The geometrical model was elaborated on real measurements of the elements of endoprosthesis and also on the results provided by the producer.
Źródło:: Journal of Applied Mathematics and Computational Mechanics; 2013, 12, 2; 89-96
2299-9965
Pojawia się w:: Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Rock strength anisotropy in high stress conditions: a case study for application to shaft stability assessments
Autorzy:: Watson, J. M.
Vakili, M.
Jakubowski, M.
Powiązania:: https://bibliotekanauki.pl/articles/178168.pdf
Data publikacji:: 2015
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: anisotropy
high stress
numerical modeling
constitutive model
Opis:: Although rock strength anisotropy is a well-known phenomenon in rock mechanics, its impact on geotechnical design is often ignored or underestimated. This paper explores the concept of anisotropy in a high stress environment using an improved unified constitutive model (IUCM), which can account for more complex failure mechanisms. The IUCM is used to better understand the typical responses of anisotropic rocks to underground mining. This study applies the IUCM to a proposed rock shaft located in high stress/anisotropic conditions. Results suggest that the effect of rock strength anisotropy must be taken into consideration when assessing the rock mass response to mining in high stress and anisotropic rock conditions.
Źródło:: Studia Geotechnica et Mechanica; 2015, 37, 1; 115-125
0137-6365
2083-831X
Pojawia się w:: Studia Geotechnica et Mechanica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Numerical analysis of the deep drawing process including the history of stress and strain
Autorzy:: Kaldunski, P.
Powiązania:: https://bibliotekanauki.pl/articles/280806.pdf
Data publikacji:: 2018
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: deep drawing
modeling
numerical analysis
FEM
stress history
strain history
Opis:: This paper discusses the results of a numerical study of circular cup drawing of steel sheets using ﬁnite element method. The drawing process is considered as a geometrical and physical nonlinear problem with unknown boundary conditions in the contact area of the system, such as the tool and the workpiece. The updated Lagrangian description is used to characterize these nonlinear phenomena on a typical incremental step time. Numerical results are obtained using an explicit method in Ansys/Ls-Dyna program. The constitutive Cowper-Symonds material model with linear hardening strain to predict material plasticity is used. The results of implementation of stresses and strains from a blanking operation ﬂat disc of a sheet of metal for deep-drawing process are presented. After the blanking process simulation, an implicit springback analysis is performed. Then a numerical analysis of cup forming from this ﬂat disc plate was carried out. The analysis results are compared with one another through reading of the sheet thickness in several characteristic points and the overall height of the product.
Źródło:: Journal of Theoretical and Applied Mechanics; 2018, 56, 3; 781-792
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Panel destressing strategies for remnant pillar extraction
Autorzy:: Vennes, Isaac
Mitri, Hani
Powiązania:: https://bibliotekanauki.pl/articles/2201414.pdf
Data publikacji:: 2022
Wydawca:: Główny Instytut Górnictwa
Tematy:: de-stress blasting
preconditioning
rockburst
numerical modeling
strzelanie torpedujące
kondycjonowanie wstępne
wstrząsy górotworu
modelowanie numeryczne
Opis:: Large-scale panel destressing is a rockburst mitigation technique employed in deep hard rock mines during remnant pillar extraction. Panels are choke blasted in the pillar footwall to cutoff the far-field major stress in the mining area and deviate them around the pillar. In this study, the effects of panel geometry and far-field stress magnitude are investigated. Destress blast performance is assessed by measuring change to the energy release rate (ERR) of all mining steps during the extraction of a simplified remnant pillar due to destressing. It is demonstrated that the energy release rate (ERR) of critical stopes is reduced by 30% with the base panel geometry. The panel thickness is shown to have the most influence on the efficiency of destressing, followed by the stand-off distance between the panel and the pillar and the overhang length of the panel. The effect of far-field stress magnitude on the ERR is also investigated, and the destress blast performance is expressed as an equivalent major principal stress reduction. It is shown that with the base panel geometry, the destressing program offers the same ERR reduction as a 9.6 MPa reduction in the far-field stress for the most critical stopes. Finally, the Copper Cliff Mine (CCM) panel destressing program is presented as a case study. The ore at risk and ERR are calculated over the extraction and destressing sequence in the pillar with a pillar-wide numerical model.
Źródło:: Journal of Sustainable Mining; 2022, 21, 3; 228--240
2300-1364
2300-3960
Pojawia się w:: Journal of Sustainable Mining
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Model of hardening elements of tools steel C80U
Autorzy:: Domański, T.
Powiązania:: https://bibliotekanauki.pl/articles/122906.pdf
Data publikacji:: 2014
Wydawca:: Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:: heat treatment
phase transformations
stress
strain
numerical modeling
obróbka cieplna
przemiany fazowe
naprężenie
odkształcenie
modelowanie numeryczne
Opis:: Hardening is one of the manufacturing processes used for improving mechanical properties such as strength, hardness and wear resistances of the mechanical components for machine parts. This paper describes modelling of the processes of steel C80U hardening. The first priority was given to thermal phenomena, phase transformations in a solid state and mechanical phenomena. A numerical algorithm of thermal phenomena was based on the Finite Elements Methods in the Galerkin formula of the heat transfer equations. In the model of phase transformations, in simulations heating process, isothermal or continuous heating (CHT) was applied, whereas in the cooling process continuous cooling (CCT) of the steel. In the model of mechanical phenomena, apart from thermal, plastic and structural strain, transformations plasticity was also taken into account. The stress and strain fields are obtained using the solution of the Finite Elements Method of the equilibrium equation in rate form. The thermophysical constants occurring in constitutive relation depend on temperature and phase composite. In order to determine plastic strain, the Huber-Mises condition with isotropic strengthening was applied, whereas for determination of transformation plasticity a modified Leblond model was used. In order to evaluate the quality and usefulness of the presented models a numerical analysis of temperature field, phase fraction, stress and strain associated hardening process of a cone-shaped fang lathe made of tool steel was carried out.
Źródło:: Journal of Applied Mathematics and Computational Mechanics; 2014, 13, 4; 35-40
2299-9965
Pojawia się w:: Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Numerical Modeling of the Degradation of the Normal Stress Under Large Number of Shearcycles
Autorzy:: Bellayoune, Assia
Messast, Salah
Boulon, Marc
Powiązania:: https://bibliotekanauki.pl/articles/2051692.pdf
Data publikacji:: 2021
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: bearing capacity of piles
normal stress
shear
friction
degradation
numerical modeling
nośność pali
naprężenie normalne
tarcie
ścinanie
degradacja
modelowanie numeryczne
Opis:: The evaluation of friction is an important element in the verification of stability and the determination of the bearing capacity of piles. In the case of cyclic stress, the soil-pile interface has a relaxation which corresponds to a fall in the horizontal stress which represents the normal stress at the lateral surface of the pile. This paper presents an explicit formulation to express the degradation of the normal stress after a large number of shear cycles as a function of cyclic parameters. In this study we are interested in the exploitation of the cyclic shear tests carried out by Pra-ai with imposed normal rigidity (CNS) in order to demonstrate the phenomenon of falling of the normal stress. The approach presented in this paper consists in proposing a simple expression for estimating the degradation of normal stress as a function of cyclic shear parameters after a large number of cycles. The validation of this approach is verified by the application of this formulation to a real case where the comparison of the simulations made by this approach with those recorded on site shows the good adaptation of this approach to this type of problems.
Źródło:: Civil and Environmental Engineering Reports; 2021, 31, 3; 118-133
2080-5187
2450-8594
Pojawia się w:: Civil and Environmental Engineering Reports
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Numerical analysis of front axle bracket strength in farm tractor
Numeryczna analiza wytrzymałościowa wspornika osi przedniej ciągnika rolniczego
Autorzy:: Samborski, S.
Kaliszuk, M.
Łusiak, T.
Kasperek, D.
Szwedziak, K.
Pruska, Ż.
Powiązania:: https://bibliotekanauki.pl/articles/336709.pdf
Data publikacji:: 2017
Wydawca:: Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Maszyn Rolniczych
Tematy:: numerical modeling
finite element method
axle bracket
stress distribution
bracket of agricultural tractor
modelowanie numeryczne
metoda elementów skończonych
wspornik osi
rozkład naprężeń
wspornik ciągnika rolniczego
Opis:: This paper describes strength evaluation for D4CS4 FA20.25 bracket, mounted in tractors of the URSUS Company. The analysis was based on stress modelling, supported by the finite element method (FEM). It was assumed in the model that the studied element was made of ductile cast iron and subject to three forces at three support points. Stress distribution simulations were run for various boundary conditions in order to identify the areas most exposed to cracking hazards. On this basis, engineering changes were introduced to increase the mechanical strength of the bracket with maximum cost-effectiveness of its production.
W artykule opisano analizę wytrzymałościową wspornika D4CS4 FA20.25 montowanego w ciągnikach firmy URSUS. Analizę przeprowadzono w oparciu o modelowania naprężeń metodą elementów skończonych (MES). W modelu założono, że element badany jest wykonany z żeliwa sferoidalnego, który był obciążony trzema siłami w trzech punktach podparcia. Przeprowadzono symulacje rozkładu naprężeń dla różnych warunków brzegowych w celu wyodrębnienia obszarów najbardziej narażonych na pękanie. Na tej podstawie wprowadzono zmiany konstrukcyjne, zwiększające wytrzymałość wspornika przy minimalizacji kosztów jego wykonania.
Źródło:: Journal of Research and Applications in Agricultural Engineering; 2017, 62, 2; 109-112
1642-686X
2719-423X
Pojawia się w:: Journal of Research and Applications in Agricultural Engineering
Dostawca treści:: Biblioteka Nauki

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