Visualization of Finite Elements and Tools for Numerical Analysis

The objective of this article is to present the results obtained in a study on the interaction between the behavior of the structure and the foundation settlements and verify the influence of normal load distribution on the columns. In this mechanism, known as structure soil interaction (SSI), as the building is constructed, a transfer of loads occurs from the columns which tend to settle more to those that tend to settle less. The study was conducted in a building which had its settlements monitored from the beginning of construction. For this purpose, a linear tridimensional numerical model was constructed and numerical analysis was performed, using the finite elements method. In these analyses, numerical models corre- sponding to the execution of each floor were used, considering the settlements measured in each stage of the construction. The results of analy- ses showed that the effect of SSI are significant for calculating the normal efforts on the columns, particularly on those located in the first floors.

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Numerical analysis of stress distribution generated in spherical polyethylene inserts by knee joint endoprotheses’ sleds

Polish Journal of Chemical Technology ◽

10.2478/pjct-2019-0012 ◽

2019 ◽

Vol 21 (2) ◽

pp. 1-5

Author(s):

Marcin Nabrdalik ◽

Michał Sobociński

Keyword(s):

Numerical Analysis ◽

Finite Elements ◽

Stress Distribution ◽

Knee Joint ◽

Titanium Alloys ◽

Numerical Method ◽

Ti6al4v Alloy ◽

Finite Elements Method ◽

Weak Points ◽

Metal Materials

Abstract The paper presents analysis of stress distribution in the friction node of knee joint endoprosthesis where sleds are made of various titanium alloys and CoCrMo cooperate with spherical polyethylene inserts. Currently used titanium alloys consists of Nb, Ta, Zr or Mo and with lesser value of Young’s modulus than Ti6Al4V alloy, or steel CoCrMo, which significantly varies from other metal materials. The obtained results make it possible to indicate the “weak points” of the accepted solution, and thus counteract the subsequent effects resulting from premature wear of endoprosthesis elements. The analysis was conducted with numerical method of ADINA System 8.6. The Finite Elements Method allowed to compute and present stress distribution quickly in all elements of the model.

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The finite element method in the analysis of the stress and strain distribution in polyethylene elements of hip and knee joints endoprostheses

MATEC Web of Conferences ◽

10.1051/matecconf/201925402025 ◽

2019 ◽

Vol 254 ◽

pp. 02025

Author(s):

Marcin Nabrdalik ◽

Michał Sobociński

Keyword(s):

Numerical Analysis ◽

Finite Elements ◽

Finite Elements Method ◽

Knee Joints ◽

Stress And Strain ◽

The Finite Element Method ◽

Artificial Joints ◽

Material Fatigue ◽

Weak Points ◽

Stress And Strain Distribution

The paper presents the numerical analysis of stress and strain occurring in the most wearable parts of hip and knee joints endoprostheses. The complexity of the processes taking place in both, natural and artificial joints, makes it necessary to conduct the analysis on the 3D model based on already existing mathematical models. Most of the mechanical failures in alloplasty are caused by material fatigue. To cut down the risk of it, we can either increase the fatigue resistance of the material or decrease the load strain. It is extremelly important to indicate the areas where damage or premature wear may occur. The Finite Elements Method makes it possible to calculate the stress and strain in particular elements of the tested models. All presented numerical calculations define quality conclusions concerning the influence of some parameters of endoprostheses on the values of stress and strain that are formed in polyethylene parts of endoprotheses of hip and knee joints. The obtained results help to reveal “weak points” in examined models and thus, counteract the subsequent effects resulting from premature wear of endoprosthesis elements. The numerical analysis was performed basing on the finite elements method using Autodesk Simulation Mechanical 2017 software and the ADINA 7.5.1.

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Prediction of Rail Profile Wear with the Increase of Vehicle Speed

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.716.659 ◽

2013 ◽

Vol 716 ◽

pp. 659-662

Author(s):

Dong Hyong Lee ◽

Jeong Won Seo ◽

Seok Jin Kwon ◽

Ha Young Choi

Keyword(s):

Numerical Analysis ◽

Finite Elements ◽

Boundary Conditions ◽

Rolling Contact ◽

Finite Elements Method ◽

Vehicle Speed ◽

Two Dimensional ◽

Contact Wear ◽

Rail Wear ◽

Finite Elements Model

A method to simulate rolling contact wear in a rail surface was developed using the finite elements method and numerical analysis. A two-dimensional finite elements model was used in order to reduce the calculation time and boundary conditions to prevent excessive deformation of a wheel and a rail were applied. A numerical analysis of rail wear at rolling contact was predicted using the Archards equation. In addition, the characteristics of rail wear with the increasing speed of vehicle were analyzed. Results show that there was not a large difference in the depths of wear on the rail head with increasing vehicle speed, but the wear on the rail gauge corner increased with increasing vehicle speed.

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REGULARITIES OF THE LINING STRESS-STRAIN STATE DURING OF THE PYLON METRO STATION CONSTRUCTION

Bridges and tunnels Theory Research Practice ◽

10.15802/bttrp2021/233871 ◽

2021 ◽

pp. 19-27

Author(s):

D. O. BANNIKOV ◽

V. P. KUPRII ◽

D. YU. VOTCHENKO

Keyword(s):

Finite Element ◽

Numerical Analysis ◽

Finite Elements ◽

Strain State ◽

Finite Element Models ◽

Bending Moments ◽

Stress Strain ◽

Normal Forces ◽

Stress Strain State ◽

Station Structure

Purpose. Perform numerical analysis of the station structure. Take into account in the process of mathematical modeling the process of construction of station tunnels of a three-vaulted station. Obtain the regularities of the stress-strain state of the linings, which is influenced by the processes of soil excavation and lining construction. Methodology. To achieve this goal, a series of numerical calculations of models of the deep contour interval metro pylon station was performed. Three finite-element models have been developed, which reflect the stages of construction of a three-vaulted pylon station. Numerical analysis was performed on the basis of the finite element method, implemented in the calculation complex Lira for Windows. Modeling of the stress-strain state of the station tunnel linings and the soil massif was performed using rectangular, universal quadrangular and triangular finite elements, which take into account the special properties of the soil massif. Station tunnel linings are modeled by means of rod finite elements. Findings. Isofields of the stress-strain state in finite-element models reflecting the stages of construction are obtained. The vertical displacements and horizontal stresses that are characteristic of a three-vaulted pylon station are analyzed. The analysis of horizontal stresses proved that at the stage of opening of the middle tunnel the scheme of pylon operation is rather disadvantageous. The analysis of bending moments and normal forces was also carried out and the asymmetry of their distribution was noted. Originality. Based on the obtained patterns of distribution of stress-strain state and force factors, it is proved that numerical analysis of the station structure during construction is necessary to take measures to prevent or reduce deformation of frames that are in unfavorable conditions. Practical value. In the course of research, the regularities of changes in stresses, displacements, bending moments and normal forces in the models of the pylon station, which reflect the sequence of its construction, were obtained.

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Numerical analysis of a method for solving 2D linear isotropic elastodynamics with traction free boundary condition using potentials and finite elements

Mathematics of Computation ◽

10.1090/mcom/3613 ◽

2021 ◽

pp. 1

Author(s):

Jorge Albella Martínez ◽

Sébastien Imperiale ◽

Patrick Joly ◽

Jerónimo Rodríguez

Keyword(s):

Boundary Condition ◽

Numerical Analysis ◽

Finite Elements ◽

Free Boundary ◽

Free Boundary Condition

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Análise numérica de ligação parafusada semirrígida em perfis formados a frio

ForScience ◽

10.29069/forscience.2019v7n2.e652 ◽

2019 ◽

Vol 7 (2) ◽

Author(s):

Emerson Cardoso de Castro ◽

Flávio Teixeira de Souza ◽

Arlene Maria Cunha Sarmanho

Keyword(s):

Numerical Analysis ◽

Numerical Model ◽

Finite Elements ◽

Three Dimensional ◽

Structural Performance ◽

Similar Tendency ◽

Von Mises ◽

Von Mises Stresses ◽

Bolt Connection ◽

Force Displacement

O presente trabalho constitui-se de uma análise numérica, por meio de elementos finitos, objetivando a reprodução via software de um ensaio experimental de ligação parafusada semirrígida em perfis formados a frio, dada no âmbito tridimensional. A análise consistiu-se a partir da reprodução da geometria do protótipo, das condições de contorno e aplicação de carregamento. Para melhor previsão do comportamento da ligação, foram inseridas ao modelo a não linearidade física e geométrica. Foram obtidas as curvas força-deslocamento e a evolução das tensões de Von Mises para os diferentes componentes do protótipo. Os resultados indicaram que o modelo numérico é cerca de duas vezes mais rígido que o experimental. Todavia, foi possível observar que o comportamento do modelo numérico possui tendência similar ao do modelo experimental e também foi possível avaliar a contribuição dos elementos da ligação para o desempenho da mesma.Palavras-chave: Análise numérica. Ligação parafusada semirrígida. Perfis formados a frio. Desempenho estrutural.Numerical analysis of semi-rigid bolt connection in cold formed profilesAbstractThe current paper is based on a numerical analysis by means of finite elements aiming at the software reproduction of an experimental test of semi-rigid bolt connection in cold formed profiles occurred in the three-dimensional scope. The analysis consisted of the reproduction of the prototype geometry, the boundary conditions, and the loading application. For a better forecast of the connection behavior, physical and geometric non-linearity were inserted to the model. The force-displacement curves and the evolution of the Von Mises stresses for the different prototype components were obtained. The results indicated that the numerical model is about twice as rigid as the experimental one. However, it was possible to observe that the behavior of the numerical model has a similar tendency if compared to the experimental model and it was still possible to evaluate the contribution of the connection elements to its performance.Keywords: Numerical analysis. Semi-rigid bolt connection. Cold-formed profiles. Structural performance.

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