Experimental Validation of a Tibiofemoral Model for Analyzing Joint Force Distribution

2008 ◽  
Author(s):  
Emily J. Miller ◽  
Rose F. Reimer ◽  
Tammy L. Haut Donahue ◽  
Kenton R. Kaufman
Keyword(s):  
Element Analysis ◽  
Joint Force ◽  
Non Invasive ◽  
Load Distributions ◽  
Analysis Technique ◽  
The Finite Element Analysis ◽  
Loading Patterns ◽  
Subject Specific ◽  
Joint Health ◽  
Specific Geometry

Mathematical models are non-invasive tools used for analyzing biomechanical conditions. Various models of the knee using the finite element analysis technique [1–6] and rigid body spring model (RBSM) [7] have been developed to predict pressure distribution in articulating joints, although the RBSM is considered the simplest of the modeling techniques, while still effectively predicting load distribution. These models can be used to study altered joint loading, which causes a degeneration of the articular cartilage, in order to gain an understanding of the etiology of osteoarthritis (OA). The purpose of this study is to develop a subject-specific analytical knee model using the RBSM approach that incorporates subject-specific geometry, joint health, and loading patterns to predict tibiofemoral load distributions.

Practical Procedures for Technical and Economic Investigation of Ship Structural Details

1981 ◽  
Vol 18 (01) ◽  
pp. 51-68
Author(s):  
Donald Liu ◽  
Abram Bakker
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Concentrations ◽  
Element Analysis ◽  
Analysis Techniques ◽  
Structural Problems ◽  
Analysis Technique ◽  
The Finite Element Analysis ◽  
Structural Details

Local structural problems in ships are generally the result of stress concentrations in structural details. The intent of this paper is to show that costly repairs and lay-up time of a vessel can often be prevented, if these problem areas are recognized and investigated in the design stages. Such investigations can be performed for minimal labor and computer costs by using finite-element analysis techniques. Practical procedures for analyzing structural details are presented, including discussions of the results and the analysis costs expended. It is shown that the application of the finite-element analysis technique can be economically employed in the investigation of structural details.

Deep Drawing of Square-Shaped Sheet Metal Parts, Part 1: Finite Element Analysis

1993 ◽  
Vol 115 (1) ◽  
pp. 102-109 ◽  
Author(s):  
S. A. Majlessi ◽  
D. Lee
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Membrane Properties ◽  
Computationally Efficient ◽  
Element Analysis ◽  
Sheet Metal Parts ◽  
Part Geometry ◽  
Analysis Technique ◽  
The Finite Element Analysis ◽  
Good Agreement

The process of square-cup drawing is modeled employing a simplified finite element analysis technique. In order to make the algorithm computationally efficient, the deformation (total strain) theory of plasticity is adopted. The solution scheme is comprised of specifying a mesh of two-dimensional finite elements with membrane properties over the deformed configuration of the final part geometry. The initial positions of these elements are then computed by minimization of the potential energy, and therefore the strain distributions are determined. In order to verify predictions made by the finite element analysis method, a drawing apparatus is built and various drawing experiments are carried out. A number of circular and square cups are drawn and strain distributions measured. It is observed that there is generally a good agreement between computed and measured results for both axisymmetric and nonaxisymmetric cases.

Simulation Analysis of Support Installation Vehicle’s Working Unit Based on ADAMS

2012 ◽  
Vol 482-484 ◽  
pp. 1707-1712
Author(s):  
Hui Sheng Guan ◽  
Ke Long Luo ◽  
Dong Dong
Keyword(s):  
Finite Element Analysis ◽  
Driving Force ◽  
3D Model ◽  
Simulation Analysis ◽  
Virtual Prototyping ◽  
Element Analysis ◽  
Joint Force ◽  
The Finite Element Analysis ◽  
Adams Software ◽  
Working Principle

This paper introduces the structural composition and the working principle of the support installation vehicle. The 3D model of the support installation vehicle is established in SolidWorks and imported into ADAMS. Then the virtual prototyping model of the support installation vehicle is established with ADAMS software. The dynamically leveling angle curve of the leveling mechanism is obtained by the simulation analysis. Curves of cylinders’ driving force and the joint force are also derived. The results of simulation analysis contribute to the finite element analysis of working unit and the designs of cylinders of the support installation vehicle.

Finite Element Investigation on Ultimate Strength of Bolted Connections

2012 ◽  
Vol 166-169 ◽  
pp. 1157-1163
Author(s):  
Wael Elleithy ◽  
Choon Kiat Lim
Keyword(s):  
Finite Element ◽  
Ultimate Strength ◽  
Finite Element Modelling ◽  
Stress Distributions ◽  
Bolted Connections ◽  
Element Analysis ◽  
Bolted Connection ◽  
Element Modelling ◽  
Load Distributions ◽  
The Finite Element Analysis

In this paper, the ultimate behaviour of bolted connections and the effect of various configurations of bolted connections on the ultimate strength are thoroughly investigated. Through finite element modelling, the stress distributions, bolt load distributions, and the effect of bolt sizes and bolt arrangements are studied in detail. The finite element analysis results show that the square shape arrangement of a bolted connection has a higher ultimate strength than that of the diamond shape arrangement. The ultimate strength of bolted connection increases as the bolts size increase until a limitation of improvement in strength is reached.

Wrinkling Study in Tube Hydroforming Process

2011 ◽  
Vol 473 ◽  
pp. 151-158
Author(s):  
Khalil Khalili ◽  
S. Ehsan Eftekhari Shahri ◽  
Parviz Kahhal ◽  
M. Soheil Khalili
Keyword(s):  
Finite Element ◽  
Strain Difference ◽  
Tube Hydroforming ◽  
Element Model ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Hydroforming Process ◽  
Specific Geometry ◽  
Finite Element Model Model ◽  
Displacement Diagram

Tube Hydroforming Process (THF) is heavily affected by the pressure-displacement diagram, and adjustment of the raw tube. Three common defects of the process are bursting, buckling and wrinkling. In this work, the leading conditions to wrinkling defect have been studied. Proper criteria are required to predict wrinkling condition, and to quantify wrinkling when subjected to various pressure-displacement diagrams. A variety of criteria have been presented by researchers, most of which are suitable to a specific geometry. In current work, two criteria are considered namely, the strain difference and the radius velocity. At first an accurate FEM (Finite Element Model) model of the process have been established and validated. Then based on a number of experiments with different diagram, the process have been simulated and analyzed. According to experiments imbalances between pressure and displacement, improper sitting of tube in the die, poor vacation of the tube and the existence of external tiny particle inside the die, are the reason of wrinkling criterion in the tube. The Response Surface Method (RSM) has been used to model the responses from the finite element analysis. The behavior of the process has been predicted using this model.

scholarly journals Analysis of Creep Behavior of Polypropylene Fibers

2011 ◽  
Vol 70 ◽  
pp. 410-415 ◽  
Author(s):  
Baris Sabuncuoglu ◽  
Memiş Acar ◽  
Vadim V. Silberschmidt
Keyword(s):  
Tensile Tests ◽  
Creep Model ◽  
Polypropylene Fibers ◽  
Suggested Model ◽  
Analysis Software ◽  
Creep Tests ◽  
Element Analysis ◽  
Analysis Technique ◽  
The Finite Element Analysis ◽  
Stress Dependent

Time and stress-dependent viscoelastic properties of polypropylene fibers are determined by means of a series of creep tests and data analysis technique. Relaxation tests are carried out to verify and update the suggested model. The tests are performed for single polypropylene fibers that form a thermally bonded low-density nonwoven. The obtained properties are implemented into the finite element analysis software MSC. Marc - Mentat. Tensile tests and simulations are performed in order to demonstrate suitability of the developed creep model. The obtained results are discussed and further recommendations are given.

Finite Element Analysis of Motion Gesture for Four-Legged Walking Robot MiniQuad-1

2012 ◽  
Vol 215-216 ◽  
pp. 941-945
Author(s):  
Jing Chao Zou ◽  
Lian Gwen Wang ◽  
Zhi Qiang Guo ◽  
Wei Hong Chen
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Robot Kinematics ◽  
Walking Robot ◽  
Element Analysis ◽  
Motion Error ◽  
Analysis Technique ◽  
The Finite Element Analysis ◽  
Structure Improvement ◽  
Improvement Measures

When walking robot MiniQuad-1 moves, the motion error is larger. The robot’s structure deformation is obvious. In order to improve the precision of the walking robot, the finite element analysis technique is adopted to research four-legged walking robot MiniQuad-1 in this paper. After the structure of the robot is introduced, the motion error of robot is discussed. The robot kinematics planning is completed based kinematics analysis. Some Motion postures are built using the solidworks. Static analysis of the motion pose is completed by using ansys software for robot MiniQuad-1. According to the analysis results, the robot structure improvement measures are determined. Further, the force and deformation for robot is studied after loading to lay the foundation for expand the robot of subsequent application.

Influence of the Ball Diameter, Material and Taper Design on Transferred Stresses of Ceramic THR

2007 ◽  
Vol 544-545 ◽  
pp. 375-378
Author(s):  
Soo Wohn Lee ◽  
Daniel G. Carrillo ◽  
D.K. Kang ◽  
Joaquín Lira-Olivares
Keyword(s):  
Material Properties ◽  
3D Models ◽  
Design Parameters ◽  
Element Analysis ◽  
Total Hip Replacements ◽  
Analysis Technique ◽  
The Finite Element Analysis ◽  
Hip Replacements ◽  
Ball Diameter ◽  
Head Component

The brittleness of ceramics has been their weak spot when considering them for total hip replacements. There are several situations from which concentrated stresses can develop and induce failure of the components. It is not a problem of the material’s properties in particular but also its design. This means that even proof tested-third generation-ISO obeying ceramics may fail if the incidence of the design parameters on them is not carefully evaluated. In this paper, the finite element analysis technique is used to show how the change of ball diameter can affect the Vonmises stress on the ball head component when it is subjected to a high (trauma-like) load. The analysis is nonlinear and was carefully tested for convergence. 3D models of four different ball head diameters where constructed, two designs of the bore/cone interface with two sets of material properties (Alumina and Zirconia) were considered. The results from these analyses are given in the form of stress maps on the ball heads; such data may be useful for surgeons, patients, and designers because it shows a direct relationship between two important parameters on ball head design (diameter and bore) and material properties, on the stresses that can cause failure of the component when they are concentrated in small elements of volume.

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