Elastic-plastic analysis of indentation damages in copper: Work-hardening and residual stress

1983 ◽  
Vol 14 (11) ◽  
pp. 2415-2421 ◽  
Author(s):  
Y. Yokouchi ◽  
T. W. Chou ◽  
I. G. Greenfield
Keyword(s):  
Residual Stress ◽  
Work Hardening ◽  
Elastic Plastic ◽  
Plastic Analysis

The Residual Stress Research of Rolling Slab Based on the No-Linear Elastic and Plastic Analysis

2011 ◽  
Vol 311-313 ◽  
pp. 1093-1096
Author(s):  
Zhao Wei Dong ◽  
Xiao Hang Wan ◽  
Shu Jun Li ◽  
Sheng Yong Liu
Keyword(s):  
Residual Stress ◽  
Surface Layer ◽  
Cold Rolling ◽  
Tension Stress ◽  
Nonlinear Method ◽  
Elastic Plastic ◽  
Linear Elastic ◽  
Residual Tension ◽  
Plastic Analysis ◽  
Pressure Stress

The cold rolling of slab is analyzed by using elastic-plastic and heat-mechanic coupling FEM with the nonlinear method. The distribution of residual stress was analyzed mainly in this paper. It is indicated by the results that the residual stress in surface layer of slab material is the pressure stress and inside the plate is the tension stress under the smaller press quantity, the residual stress in surface layer is the tension stress and inside the slab is the pressure stress under bigger press quantity, the maximum residual tension stress in the slab becomes bigger with the increment of the reduction.

Fast Simulation for Multi-Pass Welding Process Using Iterative Substructure Method: Investigation of Optimization and Efficient Computation

2014 ◽  
Author(s):  
Akira Maekawa ◽  
Atsushi Kawahara ◽  
Hisashi Serizawa ◽  
Hidekazu Murakawa
Keyword(s):  
Residual Stress ◽  
Power Plants ◽  
Welding Process ◽  
Computation Time ◽  
Efficient Computation ◽  
Element Analysis ◽  
Substructure Method ◽  
Elastic Plastic ◽  
Plastic Analysis ◽  
Welding Processes

Residual stress caused by welding processes affects characteristics of strength and fracture of equipment and piping in power plants. Numerical thermal elastic-plastic analysis is a powerful tool to evaluate weld residual stress in actual plants. However, the conventional three-dimensional precise analysis for a welding process such as multi-pass welding, machining and thermal treatment requires enormous computation time though it can provide accurate results. In this paper, the finite element analysis code based on the iterative substructure method that was developed to carry out thermal elastic-plastic analysis efficiently, with both high computational speed and accuracy, was proposed to simulate the welding process of plant equipment and piping. Furthermore, optimization of the proposed analysis code was examined and the computational efficiency and accuracy were also evaluated.

Computational Aspect of Nonlinear Fracture Mechanics Application

2015 ◽  
Author(s):  
Igor Orynyak ◽  
Andrii Oryniak
Keyword(s):  
Residual Stress ◽  
Fracture Mechanics ◽  
Thermal Stresses ◽  
Crack Tip ◽  
Pressure Vessels ◽  
Point Of View ◽  
Computational Aspect ◽  
J Integral ◽  
Elastic Plastic ◽  
Plastic Analysis

The development of powerful commercial computer programs made the concept of J-integral as computational parameter of fracture mechanics to be a very attractive one. It is equivalent to SIF in linear case, it converges in numerical calculation and the same results are obtained by different codes (programs). Besides, it is widely thought that elastic-plastic analysis gives bigger values than elastic SIF ones what is good from regulatory point of view. Such stand was reflected in the recommended by IAEA TECDOC 1627 (February 2010) devoted to pressurized thermal shock analysis of reactor pressure vessels, where the embedded crack in FEM mesh, elastic-plastic analysis with simultaneous determination of J-integral was stated as the best option of analysis. But at that time all the most widely used software were not able to treat the residual stresses, the thermal stresses in case of two different materials. Such a contradiction between requirements and the possibilities made a lot of problems for honest contractors especially in countries where the regulator had no own experience in calculation and completely relied on the authority of international documents. This means that at that time the said recommendations were harmful. The main reason of such a situation was the absence of the carefully elaborated examples. Now the capabilities and accuracy of such software are increasing. Nevertheless, some principal ambiguities and divergences of computations results in various J-integral contours around the crack tip still exist. They are exhibited when the large plastic zone emerges at the crack tip. Other problem is influence of the history of loading and the specification of the time of crack insertion in the mesh including the time of emergence of residual stress. This paper is invitation for discussion of the accuracy and restriction of computational J-integral. With this aim the detailed analysis of some simplified 2D examples of calculation of elastic -plastic J-integral for surface crack with accounting for residual stress, thermal stress and inner pressure are performed and commented. The attainment of consensus among the engineering society for treating the outcome results is the prerequisite for practical application of computational elastic plastic J-integral.

Variable material property method in the analysis of cold-worked fastener holes

2000 ◽  
Vol 35 (2) ◽  
pp. 137-142 ◽  
Author(s):  
H Jahed ◽  
S B Lambert ◽  
R N Dubey
Keyword(s):  
Residual Stress ◽  
Stress Fields ◽  
Experimental Measurements ◽  
Spatial Distributions ◽  
Residual Stress Field ◽  
Material Parameters ◽  
Elastic Plastic ◽  
Linear Elastic ◽  
Plastic Analysis ◽  
Cold Worked

Based on a general axisymmetric method of elastic-plastic analysis presented by Jahed and Dubey, elastic-plastic boundaries and residual stress fields induced by cold expansion of fastener holes is predicted. The method uses a linear elastic solution to construct an elastic-plastic solution. The material parameters are treated as field variables and their spatial distributions are obtained as part of the solution. This method uses the actual loading-unloading behaviour of the material and therefore is capable of predicting an accurate residual stress field. Results obtained here are compared with available experimental and finite element results. The agreement of the results with experimental measurements is very good. It is shown that employment of the actual unloading material curve can make a significant change in residual field prediction.

Elastic-Plastic Analysis on Residual Stress in a Metal by a Single Shot

2002 ◽  
Vol 2002.2 (0) ◽  
pp. 497-498
Author(s):  
Yasushi IMABAYASHI ◽  
Chu SAKAE ◽  
Masanobu KUBOTA ◽  
Yoshiyuki KONDO
Keyword(s):  
Residual Stress ◽  
Single Shot ◽  
Elastic Plastic ◽  
Plastic Analysis

Elastic-Plastic Thermal and Residual Stress Analysis of Adhesively Bonded Single Lap Joint

2016 ◽  
Vol 25 (1) ◽  
pp. 096369351602500 ◽  
Author(s):  
Faruk Sen
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Thermoplastic Composite ◽  
Lap Joint ◽  
Uniform Temperature ◽  
Adhesively Bonded ◽  
Elastic Plastic ◽  
Single Lap Joint ◽  
Plastic Analysis ◽  
Residual Stress Analysis

In this work, an elastic-plastic thermal and residual stress analysis were performed for adhesively bonded single lap joint. For this purpose, thermoplastic composite adherents were bonded to each other with epoxy adhesive. Thermoplastic composite material was reinforced by steel-fibres, unidirectionally. Finite element method (FEM) was preferred to obtain thermal elastic and elastic-plastic stress distributions on single lap joint. Accordingly, modelling and solution processes were achieved using ANSYS software. So as to determine effects of uniform temperature loadings on thermal and residual stresses, different values of it were loaded on the joint, uniformly. Briefly, both thermal and residual thermal stresses were calculated under uniform temperature loading which was selected from 40 °C to 80 °C. According to obtained results different thermal expansion coefficients of composite adherents and adhesive layer caused thermal and residual stresses on adhesively bonded single lap joint due to applied uniform temperature loadings. Thermal stress values for x and y-directions are very different from each other owing to orthotropic material properties of thermoplastic composite. The magnitudes of elastic analyses results are higher than elastic-plastic analysis results. Contrary to elastic analysis results, elastic-plastic analysis results were nonlinear. Thermal and residual stresses are increased by increasing uniform temperature values, so the highest values were calculated when 80 °C. The plastic yielding was firstly come into being for 50 °C loading and it is expanded related to raising thermal loadings as nonlinear.

Elastic-Plastic Analysis on Residual Stress by a Single Shot

2003 ◽  
Vol 2003.56 (0) ◽  
pp. 39-40
Author(s):  
Yasushi IMABAYASHI ◽  
Chu SAKAE ◽  
Masanobu KUBOTA ◽  
Yoshiyuki KONDO
Keyword(s):  
Residual Stress ◽  
Single Shot ◽  
Elastic Plastic ◽  
Plastic Analysis
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