The Three-dimensional Elastic-plastic Analysis of Interlaminar Stresses in Notched Thermoplastic Composites

2005 ◽  
Vol 24 (11) ◽  
pp. 1151-1158 ◽  
Author(s):  
Shu-Rong Ding ◽  
J. W. Tong ◽  
M. Shen
Keyword(s):  
Three Dimensional ◽  
Thermoplastic Composites ◽  
Interlaminar Stresses ◽  
Elastic Plastic ◽  
Plastic Analysis

A Shell-Element–Based Elastic Analysis Predicting Welding-Induced Distortions for Ship Panels

2007 ◽  
Vol 51 (02) ◽  
pp. 128-136
Author(s):  
Gonghyun Jung
Keyword(s):  
Numerical Model ◽  
Three Dimensional ◽  
Shell Element ◽  
Significant Loss ◽  
Buckling Analysis ◽  
Elastic Analysis ◽  
Plastic Strains ◽  
Elastic Plastic ◽  
Distortion Analysis ◽  
Plastic Analysis

A new numerical model, Q-Weld (Edison Welding Institute, Columbus, OH), which is a shell-element-based elastic analysis, is proposed for the prediction of the distortion induced in ship panels. Based on the results of the three-dimensional thermal-elastic-plastic analyses, it was found that the shell element-based model excluding the geometry of fillet welds and including only transverse and longitudinal plastic strains is valid without significant loss of accuracy. The developed Q-Weld predicts well-agreed distortions with the three-dimensional thermal-elastic-plastic analysis and demonstrates its potential in welding-induced distortion analysis, including buckling analysis.

Evaluation Criteria for Alternating Loads Based on Partial Inelastic Analyses

2002 ◽  
Author(s):  
Asao Okamoto ◽  
Yasuhiro Ohtake ◽  
Norimichi Yamashita
Keyword(s):  
Finite Element ◽  
Evaluation Method ◽  
Three Dimensional ◽  
Evaluation Criteria ◽  
Inelastic Behavior ◽  
Element Analysis ◽  
Plastic Strain Increment ◽  
Elastic Plastic ◽  
Stress Classification ◽  
Plastic Analysis

This paper discusses the evaluation criteria for alternating loads utilizing partial inelastic analyses and free from the stress classification. As finite element analysis becomes popular, it has been noticed by designers that in some cases the conventional stress classification does not work well. The stress classification itself had been engineered as a practical tool to evaluate the integrity of a structure by elastic analyses, which actually could have inelastic behavior. For example, primary stress limits were determined reflecting the stress level at collapse. Therefore, the problem concerning the stress classification can be solved recalling how it had been engineered. In other words, the key to solve the problem is the inelastic evaluation method corresponding to each stress category. From this point of the view, the application of the inelastic analyses becomes widely studied. Consequently, as for primary loads, it has been proven that the collapse load evaluation by Limit or Plastic Analysis is effective and practical for design analyses. On the other hand, as for the alternating loads, it is not sufficiently discussed how the alternative criteria should be without stress classification. In this paper, the following are discussed based on the calculation results in the Committee on Three Dimensional Finite Element Stress Evaluation in JPVRC. 1. Prerequisite of the elastic-plastic analysis for shakedown evaluation, and the evaluation criteria based on plastic strain increment and its distribution. 2. The advantage to use simplified elastic-plastic analysis method than to perform fully elastic-plastic analyses, and the calculation procedure for Ke factors to be used with. The associated code rules are proposed.

Sign in / Sign up

Export Citation Format

Share Document