Finite element analysis of the contact forces between viscoelastic particles

2013 ◽  
Author(s):  
Q. J. Zheng ◽  
H. P. Zhu ◽  
A. B. Yu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Contact Forces ◽  
Element Analysis

Finite Element Analysis of Input Axis in Six-Speed Transmission

2013 ◽  
Vol 477-478 ◽  
pp. 45-48
Author(s):  
Qing Dun Zeng ◽  
Xin Pan
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fatigue Life ◽  
Simulation Analysis ◽  
Virtual Prototype ◽  
Contact Forces ◽  
Element Analysis ◽  
Virtual Prototype Technology ◽  
Gear Contact ◽  
D Model

The joint simulation of Virtual Prototype Technology and Finite Element Method was utilized to perform the analysis of both strength and fatigue life of the input axis in a six-speed vehicle transmission with three axes. Firstly, the software Pro/E was used to establish a 3-D model of the input axis and its gear engagement, and the model was then imported into a software ADMAS of the virtual prototype technology to perform a dynamic simulation analysis. Secondly, the gear contact forces obtained by above-mentioned analysis were used as the loading condition of finite element analysis of the input axis to check its strength. Finally, the fatigue of meshing teeth on the input axis was analyzed to determine the fatigue life of the input axis. The results show that the static strength of input axis can meet the requirement of safe use under the working condition of input torque T=1.5kN·m, and the minimum fatigue life on the place where the stress is maximum at flexural root of a tooth is about 2 million times.

scholarly journals Mechanical and Finite Element Analysis of an Innovative Orthopedic Implant Designed to Increase the Weight Carrying Ability of the Femur and Reduce Frictional Forces on an Amputee’s Stump

2019 ◽  
Vol 184 (Supplement_1) ◽  
pp. 627-636 ◽  
Author(s):  
Tejas P Chillale ◽  
Nam Ho Kim ◽  
Larry N Smith
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Weight Bearing ◽  
Contact Forces ◽  
Element Analysis ◽  
Normal Contact ◽  
Fea Modeling ◽  
Significant Difference ◽  
Frictional Forces ◽  
Weight Carrying

Abstract This study was designed to test the hypothesis that: “A properly designed implant that harnesses the principle of the incompressibility of fluids can improve the weight carrying ability of an amputee’s residual femur and reduce the frictional forces at the stump external socket interface.” The hypothesis was tested both mechanically on an Amputee Simulation Device (ASD) and through Finite Element Analysis (FEA) modeling software. With the implant attached to the femur, the FEA and ASD demonstrated that the femur carried 90% and 93% respectively of the force of walking. Without the implant, the FEA model and ASD femur carried only 35% and 77%, respectively, of the force of walking. Statistical calculations reveal three (3) degrees of separation (99% probability of non-random significant difference) between with and without implant data points. FEA modeling demonstrates that the normal contact forces and shear forces are pushed the distal weight-bearing area of the amputee stump, relieving the lateral stump of frictional forces. The ASD mechanical and FEA modeling data validate each other with both systems supporting the hypotheses with confidence intervals of three degrees of separation between with implant and without implant models.

Tibio-Femoral Contact Force During Gait: An Iterative Method Using EMG-Constrained Multi-Body Simulation and Finite Element Analysis

2013 ◽  
Author(s):  
Silvia Pianigiani ◽  
Friedl De Groote ◽  
Lennart Scheys ◽  
Pierre Gillen ◽  
Luc Labey ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Degrees Of Freedom ◽  
Image Data ◽  
Contact Forces ◽  
Patient Specific ◽  
Optimization Approach ◽  
Element Analysis ◽  
Force Calculation

In this study, we present an innovative methodology (Figure 1) to calculate patient specific tibio-femoral (TF) contact forces by integrating medical image data, 3D skin-mounted marker trajectories, ground reaction forces, electromyography (EMG) data and finite element analysis (FEA). The muscle redundancy problem is solved through an EMG-constrained optimization approach. Calculated muscle forces are input to a FEA to calculate TF contact forces. Kinematics of the degrees of freedom (DOFs) of the knee that cannot be accurately assessed from the trajectories of skin-mounted markers, are estimated using a novel iterative procedure which combines muscle force calculation with dynamic FEA. The presented methodology is applied to analyze TF contact forces of a walking trial performed on an instrumented treadmill of which the speed was sequentially ramped up and down. The results presented in this abstract will be validated against the in-vivo measured TF contact forces.

An Analytical Contact Model for Design of Compliant Fingers

2007 ◽  
Vol 130 (1) ◽  
Author(s):  
Chao-Chieh Lan ◽  
Kok-Meng Lee
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Structural Reliability ◽  
Contact Problems ◽  
Contact Forces ◽  
Constrained Minimization ◽  
The Other ◽  
One Dimension ◽  
Shear Deformations ◽  
Element Analysis

A compliant gripper gains its dextral manipulation by the flexural motion of its fingers. It is a preferable device as compared to grippers with multijoint actuations because of reduced fabrication complexity and increased structural reliability. The prediction of contact forces and deflected shape are essential to the design of a compliant finger. A formulation based on nonlinear constrained minimization is presented to analyze contact problems of compliant fingers. The deflections by flexural and shear deformations are both considered. For a planar finger, this formulation further reduces the domain of discretization by one dimension. Hence, it offers a simpler formulation and is computationally more efficient than other methods such as finite element analysis. This method is rather generic and can facilitate design analysis and optimization of compliant fingers. We illustrate some of these attractive features with two types of compliant fingers, one for object handling and the other for snap-fit assembly applications.

Finite Element Analysis of Structural and Electromagnetic Effects on Asperity Contacts

2009 ◽  
Author(s):  
David Noyes ◽  
Itzhak Green
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Electrical Contact ◽  
Three Dimensional ◽  
Contact Forces ◽  
Element Analysis ◽  
Magnetic Forces ◽  
Asperity Contacts ◽  
Contact Models ◽  
Current Densities

This work presents a combination of two dimensional (2D) and three dimensional (3D) finite element analysis (FEA) of structural and electrical contact between two nonconforming hemispheres at various vertical interferences. Items of particular interest include contact forces, current densities, and magnetic forces. The results are normalized to be applicable to micro and macro-scaled contact models. To test the validity of the analysis, the results are compared to another work focusing on contact between a hemisphere and rigid flat.

Finite Element Analysis of Electromagnetic Effects on Hemispherical Contacts

2008 ◽  
Author(s):  
Kelly Tecker ◽  
Itzhak Green
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Electrical Contact ◽  
Three Dimensional ◽  
Contact Forces ◽  
Element Analysis ◽  
Magnetic Forces ◽  
Electromagnetic Effects ◽  
Contact Models ◽  
Current Densities

This work presents a three dimensional finite (3D) element analysis (FEA) of electrical contact between two non-conforming hemispheres at various vertical interferences. Items of particular interest include contact forces, current densities, and magnetic forces. The results are normalized to be applicable to micro and macro-scaled contact models. To test the validity of the analysis, the results are compared to another work focusing on contact between a hemisphere and rigid flat.

Pseudo Elimination of Geometry Dependence in Surrogate Models of Distributed Knee Loads From an Explicit Dynamic Finite Element Analysis

2015 ◽  
Author(s):  
Matthew J. Adams ◽  
Anne K. Silverman ◽  
Cameron J. Turner
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Surrogate Model ◽  
Contact Forces ◽  
Element Analysis ◽  
Explicit Finite Element ◽  
Wear Rates ◽  
Lateral Contact ◽  
Geometry Dependence ◽  
Additional Surgery

The premise of a total knee replacement (TKR) is to alleviate pain and increase joint mobility. The expected 20 year life span of the knee insert exceeds that of the standard patient given traditional wear and tear. With more active lifestyles, greater wear rates and shorter life spans are predicted for tibial inserts. Greater wear rates increase the probability that a patient will require additional surgery later in life. This research provides a knee loading model to estimate the pressure loading distribution through Finite Element Modeling (FEM). The publicly available patient data was used to eliminate the geometry dependence in a surrogate model of distributed knee loads from an explicit Finite Element Analysis (FEA). The developed method based upon FEM and FEA, produced two notable results. The secondary results showed the FEM accurately estimated the medial and lateral contact forces during the stance phase. However, the primary result was that the surrogate model successfully interpolated the contact surface forces using results from the FEA without requiring any knowledge of the geometry of the contact surfaces.

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