scholarly journals The Mechanical Behavior of Bone Cement in THR in the Presence of Cavities

2014 ◽  
Vol 4 (3) ◽  
pp. 625-630
Author(s):  
A. Benouis ◽  
B. Serier ◽  
B. Bachir Bouiadjra
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Mechanical Behavior ◽  
Bone Cement ◽  
Von Mises Stress ◽  
Lateral Part ◽  
The Finite Element Method ◽  
Breaking Strain ◽  
Von Mises ◽  
Element Method

In this work we analyze three-dimensionally using the finite element method, the level and the Von Mises stress equivalent distribution induced around a cavity and between two cavities located in the proximal and distal bone cement polymethylmethacrylate (PMMA). The effects of the position around two main axes (vertical and horizontal) of the cavity with respect to these axes, of the cavity - cavity interdistance and of the type of loading (static) on the mechanical behavior of cement orthopedic are highlighted. We show that the breaking strain of the cement is largely taken when the cement in its proximal-lateral part contains cavities very close adjacent to each other. This work highlights not only the effect of the density of cavities, in our case simulated by cavity-cavity interdistance, but also the nature of the activity of the patient (patient standing corresponding to static efforts) on the mechanical behavior of cement.

scholarly journals Finite element analysis of the tibial component alignment in frontal and sagittal plane in total knee arthroplasty

2021 ◽  
Vol 68 (3) ◽  
pp. 374-378
Author(s):  
Roman Popescu ◽  
◽  
Stefan Cristea ◽  
Adrian Marius Pascu ◽  
Valentin Oleksik ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Tibial Component ◽  
Sagittal Plane ◽  
Frontal Plane ◽  
Von Mises Stress ◽  
The Finite Element Method ◽  
Tibial Resection ◽  
Von Mises ◽  
Element Method

Background. This study aims to analyze the tibial component using the finite element method by cutting the tibial in frontal and sagittal planes at an angle between 1.5° (valgus and anterior tilt) and -1.5° (varus and posterior tilt). Methods. This experimental study used the finite element method as an useful tool for simulating the positioning of the tibial component in order to create a personal pre-operative planning. For the finite element method analysis, a geometrical model of a tibia from a cadaver was three – dimensionally scanned and the tibial component, polyethylene and cement, were three-dimensionally shaped in Computer-Aided Design program using material data such as Young modulus (gigapascal – GPa) and the Poisson coefficient. The analysis determined the equivalent von Mises stress, the maximum displacement of the components and the equivalent von Mises deformation. The results showed that equivalent tension and deformation have higher values in the tibia and the polyethylene, which deform faster than cement and the tibial component. In our study, we chose to simulate the tibial resection at a cutting angle ± 1.5° from neutral positioning (which is represented in frontal plane by the perpendicular on the mechanical axis and in sagittal plane by the posterior slope of 7 degree) in frontal and sagittal plane in order to find the minimum threshold from which the tibial component malalignment may begin to determine unfavorable effects. Results. Our results have shown detrimental effects begin to appear for the polyethene component at -1.5° in frontal plane, and the rest of the components at 1.5° in sagittal plane. Conclusion. This finding leads us to propose preoperative planning based on personal calculus of predefined angles, which may show the surgeon the optimal implantation position of the tibial component.

Investigation of API 8 Round Casing Connection Performance—Part I: Introduction and Method of Analysis

1984 ◽  
Vol 106 (1) ◽  
pp. 130-136 ◽  
Author(s):  
W. T. Asbill ◽  
P. D. Pattillo ◽  
W. M. Rogers
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Internal Pressure ◽  
Mechanical Behavior ◽  
Experimental Analysis ◽  
Strain Gages ◽  
The Finite Element Method ◽  
Strength Of Materials ◽  
Methods Of Analysis ◽  
Element Method

The purpose of this investigation was to gain a better understanding into the mechanical behavior of the API 8 Round casing connection, when subjected to service loads of assembly interference, tension and internal pressure. The connection must provide both structural and sealing functions and these functions were evaluated by several methods. Part I discusses the methods of analysis, which include hand calculations using strength of materials, finite element method via unthreaded and threaded models, and experimental analysis using strain gages. Comparisons of all three methods are made for stresses and show that the finite element method accurately models connection behavior.

scholarly journals A study of stress, displacements and strain in a stress concentrator using analytical calculus and Finite Element Method

2019 ◽  
Vol 1 (1) ◽  
pp. 13-20
Author(s):  
Brizeida Nohemí Ojeda
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stress Concentrator ◽  
The Finite Element Method ◽  
Von Mises ◽  
Element Method

A study of stresses, displacements, and strain, based on a classic solid mechanic’s model, specifically a plate with hole, around which a stresses concentration, is presented. For this purpose, the stresses analysis was carried out in a hole concentrator subjected to traction. The model's material was ASTM A36. The stresses were analytically calculated, through von Mises' theory. In addition, the analysis of the stresses using the finite element method (FEM) was carried out. Subsequently, displacements and unitary deformation were determined in the part. The results obtained report an error of 8.7% between the stresses of von Mises through analytical calculus and using the FEM.

scholarly journals Extended finite element method for simulating the mechanical behavior of multiple random holes and inclusions in functionally graded material

2017 ◽  
Vol 20 (K2) ◽  
pp. 141-147
Author(s):  
Bang Kim Tran ◽  
Huy The Tran ◽  
Tinh Quoc Bui ◽  
Thien Tich Truong
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Mechanical Behavior ◽  
Functionally Graded Material ◽  
Extended Finite Element Method ◽  
Functionally Graded ◽  
The Finite Element Method ◽  
Extended Finite Element ◽  
Graded Material ◽  
Element Method

Analysis of mechanical behavior of a structure containing defects such as holes and inclusions is essential in many engineering applications. In many structures, the discontinuities may have a significant influence on the reduction of the structural stiffness. In this work, we consider the effect of multiple random holes and inclusions in functionally graded material (FGM) plate and apply the extended finite element method with enrichment functions to simulate the mechanical behavior of those discontinuous interfaces. The inclusions also have FGM properties. Numerical examples are considered and their obtained results are compared with the COMSOL, the finite element method software.

Meso modeling of silk wire rope scaffolds in tissue engineering

2016 ◽  
Vol 47 (3) ◽  
pp. 377-389 ◽  
Author(s):  
Sayyed Behzad Abdellahi ◽  
Elham Naghashzargar ◽  
Dariush Semnani
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Mechanical Behavior ◽  
Element Model ◽  
Maximum Error ◽  
Wire Rope ◽  
The Finite Element Method ◽  
Energy Potential ◽  
Wire Ropes ◽  
Element Method

Finite element method can provide valuable results and information to evaluate and assess the mechanical behavior of tissue engineered scaffolds. In this investigation, a structurally and analytically based model is applied to analyze and to describe the mechanical properties of wire rope yarns as scaffold or other applications in textile engineering. In order to modeling the mechanical behavior of single yarn, non-linear hyperfoam model with three strain energy potential has been used. The results of finite element model are compared with an experimental approach and showed good agreement between software and experimental analysis with a maximum error at break of about 4.3%. As a result, validation of the finite element method is guaranteed for analysis of other structure of multi twisted yarn or wire ropes.

Mechanical behavior of coronary stents investigated through the finite element method

2002 ◽  
Vol 35 (6) ◽  
pp. 803-811 ◽  
Author(s):  
Francesco Migliavacca ◽  
Lorenza Petrini ◽  
Maurizio Colombo ◽  
Ferdinando Auricchio ◽  
Riccardo Pietrabissa
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Mechanical Behavior ◽  
Coronary Stents ◽  
The Finite Element Method ◽  
Element Method

scholarly journals THE EFFECTS OF INTERBRACKET DISTANCE AND GABLE BENDS ON THE FORCE AND MOMENTS IN A SEGMENTED ARCH APPROACH: A NUMERICAL-EXPERIMENTAL STUDY

2018 ◽  
Vol 48 (1) ◽  
pp. 63-67
Author(s):  
M. A. FERREIRA ◽  
F. R.M. RODRIGUES ◽  
P. C. BORGES ◽  
M. A. LUERSEN
Keyword(s):  
Finite Element Method ◽  
Experimental Study ◽  
Finite Element ◽  
Statistical Difference ◽  
Von Mises Stress ◽  
The Finite Element Method ◽  
Force System ◽  
Space Closure ◽  
Von Mises ◽  
Deactivation Process

The present paper verified the effect of the interbracket distance on the force system developed by orthodontic retraction springs with two delta geometries measured during space closure when spaces between teeth are present. By using a platform transducer, five different interbracket distances were tested. Also the finite element method was applied to know the von Mises stress during spring activation/deactivation process. It was concluded that the interbracket distance and spring geometry variables have not caused significant influence on the force system resulting from activations, but activation has produced a statistical difference.

scholarly journals Desain dan Analisis Tegangan Alat Pengangkat Roket Kapasitas 10 Ton Menggunakan Metode Elemen Hingga

2019 ◽  
Vol 2 (01) ◽  
pp. 23-26
Author(s):  
Lasinta Ari Nendra Wibawa
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Von Mises Stress ◽  
The Finite Element Method ◽  
Safety Factors ◽  
Element Analysis ◽  
Simulation Results ◽  
Von Mises ◽  
Aluminum Alloy 7075

This study examines the design and stress analysis of a 10 ton capacity rocket lifting device using the finite element method. The material used is Aluminum alloy 7075. Finite element analysis is done numerically by using Autodesk Inventor Professional 2017. software The simulation results show that the structure of the rocket lift has Von Mises stress, deformation, mass, and safety factors of 46.34 MPa, 0.7947 mm, 186.75 kg, and 3.13.

Finite Element Analysis of a Steel Bracket

2014 ◽  
Vol 1061-1062 ◽  
pp. 584-587
Author(s):  
Xiao Liang Chen ◽  
Zuan Tian ◽  
Yuan Ping Li
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Mechanical Behavior ◽  
Sheet Metal ◽  
Theoretical Method ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Stress And Deformation ◽  
Element Method

With the development of the society, sheet metal filing cabinets have become popular in the office. When filing cabinets store too many paper documents, the interlayer splints often fail because of the failure of the small brackets below. The stress and deformation of brackets were studied by the theoretical method and the finite element method. Results show some small machining shape defects have little influence on the mechanical behavior of brackets. The failure reason of small brackets is not the strength, but the instability.

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