scholarly journals Numerical analysis of stress and strain occuring in the contact area of ceramic head - ceramic cup in the hip endoprostheses

2013 ◽  
Vol 12 (2) ◽  
pp. 89-96
Author(s):  
Michal Sobocinski ◽  
Keyword(s):  
Numerical Analysis ◽  
Contact Area ◽  
Stress And Strain ◽  
Ceramic Head

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

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.

Simulation Research on the Member Removal Method of the Typical Construction in Collapse Accident

2012 ◽  
Vol 166-169 ◽  
pp. 2658-2662
Author(s):  
Xin Chen
Keyword(s):  
Numerical Analysis ◽  
Numerical Model ◽  
Wenchuan Earthquake ◽  
Friction Force ◽  
Contact Area ◽  
Simulation Research ◽  
Removal Method ◽  
Rescue Technique ◽  
Collapsed Buildings

Component removal method is usually taken to open up relief channel. It is necessary to make a research on the feasibility of removing and make an analysis on some problems. This paper summarized the typical collapsed buildings and the typical rescue technique used in Wenchuan earthquake. The numerical model of typical buildings collapsed was gotten . Based on the characteristics of the application of removing technique, a numerical analysis was made. The results show that the angle between the component and ground should not be changed. The direction in which the components are lifted should be in a moderate direction with other lap components .Try best to make its contact area produce some friction force.

Numerical Analysis about the Effects of PV Panels on the Mechanical Properties of Frame-Shear Structure

2014 ◽  
Vol 986-987 ◽  
pp. 940-943
Author(s):  
Wei Peng ◽  
Guo Quan Zhu ◽  
Guo Ping Chen ◽  
Shi Feng Zeng
Keyword(s):  
Numerical Analysis ◽  
Solar Energy ◽  
Solar Power ◽  
Technical Specification ◽  
Structure Design ◽  
Structural Safety ◽  
Wall Structure ◽  
Stress And Strain ◽  
Negative Effects ◽  
Shear Structure

As a kind of pollution-free and sustainable energy, solar energy has received people’s favor increasingly. Integration of solar power and architecture has become one of the important ways that people use solar energy. In this paper, numerical analysis of four frame-shear wall structure models on which PV panels are installed or not installed is conducted by ANSYS. The results show that integration of solar power and architecture meets the requirements of technical specification for concrete structures of tall building. But PV panels installed on the building surface will increase story displacement and produce stress and strain redistribution, which have negative effects on structural safety. This study provides a reference for the structure design of integration of solar power and architecture.

MAST BEHAVIOUR ANALYSIS AND PECULIARITIES OF NUMERICAL MODELLING/STIEBŲ ELGSENOS ANALIZĖ IR SKAITINIO MODELIAVIMO YPATUMAI

2008 ◽  
Vol 14 (1) ◽  
pp. 61-66 ◽  
Author(s):  
Algirdas Juozapaitis ◽  
Remigijus Kutas ◽  
Donatas Jatulis
Keyword(s):  
Numerical Analysis ◽  
Analytical Method ◽  
Computer Aided Design ◽  
Stress And Strain ◽  
Strain Fields ◽  
Computer Aided ◽  
Linear Modelling ◽  
Practical Design ◽  
Non Linear ◽  
Aided Design

Paper is assigned to numerical analysis peculiarities of masts applying specialised computer‐aided design packages. Mast's deformable behaviour is described as non‐linear one. The test problem of mast is solved by two widely applied in Lithuania computational packages STAADpro and Robot Millennium and the specialised programme for mast design SUDM. A corrected analytical method for mast guy analysis, taking into account a force component, acting along the guy supports. A performed numerical experiment is aimed to clarify the possibilities of the above‐mentioned numerical analysis instruments for geometrical non‐linear modelling of structure. The accuracy errors when determining the mast stress and strain fields by numerical analysis packages comparing with the ones obtained by a corrected analytical method are indicated. Possibilities of employing the considered computer‐aided design programming packages for practical design of masts are discussed. Santrauka Straipsnyje aptariami stiebų kaip netiesiškai deformuojamų konstrukcinių sistemų skaičiavimo ypatumai naudojant kompiuterinio projektavimo specializuotus programinius paketus. Sprendžiamas stiebo elgsenos analizės ir skaičiavimo uždavinys pasitelkiant dvi plačiai Lietuvoje taikomas statybinių konstrukcijų kompiuterinio projektavimo programas STAADpro ir Robot Millennium bei specializuotą stiebų skaičiavimo programą SUDM. Straipsnyje pateikiama ir patikslinta analizinė stiebo atotampos skaičiavimo metodika, rodanti apkrovos komponentę, veikiančią išilgai atotampos atramų. Remiantis atliktu skaitiniu eksperimentu, yra sprendžiama apie minėtųjų kompiuterinio projektavimo programinių paketų galimybes modeliuoti geometriškai netiesinės sistemos elgseną. Nurodomos šių programinių paketų stiebų elementų įrąžų bei poslinkių apskaičiavimo lyginant su patikslinta analizine skaičiavimo metodika paklaidos, aptariamos minėtųjų kompiuterinio projektavimo programų praktinio taikymo stiebams skaičiuoti galimybės.

The Influence of Operating Loads on the State of Stress and Strain in Selected Load-Bearing Elements of a Tower-Type Headgear Structure in the Light of the Experimental Data / Wpływ Obciążeń Eksploatacyjnych Na Stan Naprężenia Oraz Przemieszczenia Elementów Nośnych Konstrukcji Basztowej Wieży Szybowej W Świetle Przeprowadzonych Eksperymentów

2012 ◽  
Vol 57 (4) ◽  
pp. 831-842
Author(s):  
Stanisław Wolny
Keyword(s):  
Experimental Data ◽  
Numerical Analysis ◽  
The State ◽  
Strength Analysis ◽  
Stress And Strain ◽  
Structural Elements ◽  
Load Bearing ◽  
State Of Stress ◽  
Strain Stress ◽  
Bearing Structure

Abstract In order that the ultimate state method should be applied to the strength analysis of the tower-type headgear structure, it is required that the design loads and endurance parameters be first established. For that purpose the characteristics of loads experienced by structural elements of the headgear structure are required (Wolny, 2012) as well as the numerical analysis of stresses and strains. Thus obtained results are verified through stress (strain) measurements taken in structural elements subjected to highest loads found on the basis of the stress map derived from numerical analysis, being the subject matter of the present study. Strain (stress) measurements are taken on the beams located at the floor level +65.00 m on which the winding machines are positioned (drive shaft bearings, stators in the electric motors), as shown schematically in Fig. 2. The strength analysis by numerical methods is restricted to those elements of the load bearing structure in the headgear at the level (+65.00) where the strain (stress) and measurements are taken and where loads are measured that give rise to the maximal strain changes (Wolny, 2012). Alongside the strain (stress) measurements in the load-bearing elements of the headgear structure, measurements are taken of horizontal displacements at selected points of the structure with the use of an interferometric radar IBIS-S. Results of the repeated numerical analysis of the state of stress, restricted to those elements of the load bearing structure in the tower-type headgear where the maximal loads are registered (Wolny, 2010), agree well with experimental data obtained from tests done on a real object. Therefore, the numerical analyses of the state of stress and strain in the load-bearing elements of the headgear structures operated in the Polish collieries lead us to the assumption that when analysing the geometry of the driving systems in the winding gear, the structures on which the elements of the winder installation are positioned ought to be treated as rigid. This conclusion is further corroborated by displacement measurements by geodetic methods taken on selected points of the tower-type headgear structure. An interesting point is that the tower-type headgear structure above its first floor level will behave as a rigid solid.

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