A Numeric Analyses Method and Application of Loess Collapse Deformation

2011 ◽  
Vol 105-107 ◽  
pp. 1572-1575
Author(s):  
Rong Jian Li ◽  
Liu Ming Fan ◽  
Wen Zheng ◽  
Gao Feng Che
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Nonlinear Finite Element ◽  
Computational Results ◽  
Nonlinear Finite Element Method ◽  
Finite Element Program ◽  
Plate Test ◽  
Collapsible Loess ◽  
Element Program ◽  
Modulus Method

The collapse settlement of loess foundation is one of issues in engineering which need to be solved. Firstly, a finite element program was developed and the computational function of collapse deformation was implemented based on chord modulus method. Then, the comparison of the measured collapse settlement in a loading plate test and the computational collapse settlement based on the finite element were analyzed. The computational results show that the nonlinear finite element method based on the chord modulus should be recommended to evaluate the collapse deformation, owing to its potential application that it may consider the collapse deformation field of the whole collapsible loess foundation.

The Implementation and Assessment of the Nonlinear Finite Element Method Based on the Chord Modulus in Loess Subgrade

2011 ◽  
Vol 255-260 ◽  
pp. 3316-3320 ◽  
Author(s):  
Rong Jian Li ◽  
Wen Zheng ◽  
Hao Duan ◽  
Gao Feng Che ◽  
Wu Yi Jiao
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Summation Method ◽  
Nonlinear Finite Element ◽  
Deformation Field ◽  
Nonlinear Finite Element Method ◽  
The Finite Element Method ◽  
Total Settlement ◽  
Modulus Method ◽  
Element Method

The chord modulus method mostly used in the layer-wise summation method to evaluate the total settlement of subgrade at present. In order to analyze the deformation field, it is necessary that one of key problem should be considered and solved how to use the chord modulus to implement the computation of the finite element method. Firstly, this paper reviews the characteristics of chord modulus theory. Secondly, the solution how the chord modulus is introduced into the finite element method is discussed, and subsequently the corresponding nonlinear finite element codes are developed. The computational results show that the nonlinear finite element method based on the chord modulus should be recommended owing to its potential application that it may consider the deformation field of the whole subgrade.

Moving Grid Method for Simulating Crack Propagation

2013 ◽  
Vol 405-408 ◽  
pp. 3173-3177
Author(s):  
Shu Feng Xu ◽  
Huai Fa Ma ◽  
Yong Fa Zhou
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Crack Propagation ◽  
Grid Method ◽  
Nonlinear Finite Element ◽  
Moving Grid ◽  
Finite Element Program ◽  
Element Program ◽  
Element Algorithm ◽  
Element Method

A moving grid nonlinear finite element method was used in this study to simulate crack propagation. The relevant elements were split along the direction of principal stress within the element and thus automatic optimization processing of local mesh was realized. We discussed the moving grid nonlinear finite element algorithm was proposed, compiled the corresponding script files based on the dedicated finite element language of Finite Element Program Generator (FEPG), and generate finite element source code programs according to the script files. Analyses show that the proposed moving grid finite element method is effective and feasible in crack propagation simulation.

Relevance of Mesh Dimension Optimization, Geometry Simplification and Discretization Accuracy in the Study of Mechanical Behaviour of Bare Metal Stents

2011 ◽  
Vol 2 (1) ◽  
pp. 1-15
Author(s):  
Mariacristina Gagliardi
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Degrees Of Freedom ◽  
Bare Metal Stents ◽  
Nonlinear Finite Element ◽  
Metal Stents ◽  
Bare Metal ◽  
Nonlinear Finite Element Method ◽  
Convergence Test ◽  
Geometry Simplification

In this paper, the authors propose a set of analyses on the deployment of coronary stents by using a nonlinear finite element method. The goal is to propose a convergence test able to select the appropriate mesh dimension and a methodology to perform the simplification of structures composed of cyclically repeated units to reduce the number of degrees of freedom and the analysis run time. A systematic study, based on the analysis of seven meshes for each model, was performed, gradually reducing the element dimension. In addition, geometric models were simplified considering symmetries; adequate boundary conditions were applied and verified based on the results obtained from the analysis of the whole model.

Performance Evaluation of Spring for the Vehicle Suspension System Using the Nonlinear Finite Element Method

2014 ◽  
Vol 635-637 ◽  
pp. 594-597
Author(s):  
Byeong Soo Kim ◽  
Byung Young Moon ◽  
Sung Kwan Kim
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Composite Material ◽  
Suspension System ◽  
Nonlinear Finite Element ◽  
Nonlinear Finite Element Method ◽  
Air Spring ◽  
Rubber Sleeve ◽  
The Impact ◽  
Element Method

Air spring is used for the suspension system and it affects the vehicle stability and riding comfort by improving the impact-relief, braking, and cornering performance. Air Spring is comprised of the upper plate, lower plate, and rubber sleeve. Rubber sleeve is the composite material, which is made up of combination of rubber and Nylon, and the characteristics are changed according to the shape of rubber-sleeve, the angle of reinforcement cord. In this study, the distribution of internal stresses and the deformation of rubber composite material are analyzed through the nonlinear finite element method. The result showed that the internal maximum stresses and deformations about the changes of cord angle caused the more the Young's modulus decrease, the more maximum stress reduced.

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