Plane stress elastic-plastic fracture criteria and constraint intensity in crack tip regions

1990 ◽  
Vol 37 (3) ◽  
pp. 675-680 ◽  
Author(s):  
Jun Sun ◽  
Zengjie Deng ◽  
Mingjing Tu
Keyword(s):  
Plane Stress ◽  
Crack Tip ◽  
Fracture Criteria ◽  
Elastic Plastic

Asymptotic Crack-Tip Fields for Mixed Stationary Crack under Plane Stress Conditions in Pressure Sensitive and Elastic-Plastic Materials

2010 ◽  
Vol 146-147 ◽  
pp. 611-614
Author(s):  
Chen Hua Lu ◽  
Su Fang Xing ◽  
Wen Jia Wang ◽  
Jian Bing Sang ◽  
Bo Liu
Keyword(s):  
Plane Stress ◽  
Yield Criterion ◽  
Crack Tip ◽  
Flow Rule ◽  
Basic Solution ◽  
Crack Tip Field ◽  
Plane Stress Condition ◽  
Elastic Plastic ◽  
Pressure Sensitive ◽  
Elastic Plastic Materials

Based on the parabolic yield criterion reflected by pressure sensitive and the SD effect, the material constitutive equation is given by orthogonal flow rule. In the plane stress condition, a basic solution in elastic-plastic crack tip field is given. The different structures of solutions with different plastic mixity are analyzed. Different parameters in crack-tip stress field and the singularity in the strain field are discussed. These results provide a theoretical reference for engineering applications.

A Simplified Method Study of Aluminium Alloy Fatigue Crack Tip Parameters Computed by Elastic-Plastic Finite Element Model

2010 ◽  
Vol 97-101 ◽  
pp. 2748-2751
Author(s):  
Xin Song ◽  
Jing Zhong Xiang ◽  
Jia Zhen Zhang
Keyword(s):  
Finite Element ◽  
Fatigue Crack ◽  
Aluminium Alloy ◽  
Crack Tip ◽  
Element Model ◽  
Crack Model ◽  
Dynamic Crack ◽  
Elastic Plastic ◽  
Static Crack ◽  
Element Computation

Fatigue crack propagation of aluminium alloy 7049-OA has been studied by non-linear finite element business-oriented software ABAQUS, and elastic-plastic finite element models of static fatigue crack and dynamic fatigue crack of center crack panel (CCP) specimens are also built. Based on the finite element computation results, the differences of stress and crack opening displacement around crack tip of static crack model have been compared with those of dynamic crack model. The compared results showed that the finite element computation results of dynamic crack model can be replaced by the results calculated by the static crack model. Fatigue crack tip parameters of aluminium alloy CCP specimens can be calculated by elastic-plastic finite element model of static crack. This is an effective method to cut down the computation expense and promote the computational efficiency.

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