scholarly journals J-A elastic-plastic crack tip field and the two-parameter fracture criterion

2016 ◽  
Vol 2 ◽  
pp. 26-33 ◽  
Author(s):  
Yu.G. Matvienko ◽  
G.P. Nikishkov
Keyword(s):  
Fracture Criterion ◽  
Crack Tip ◽  
Crack Tip Field ◽  
Elastic Plastic ◽  
Two Parameter

Constraint intensity in crack tip field and elastic-plastic fracture criterion

1989 ◽  
Vol 34 (2) ◽  
pp. 413-418 ◽  
Author(s):  
Jun Sun ◽  
Zengjie Deng ◽  
Zhonghua Li ◽  
Mingjing Tu
Keyword(s):  
Fracture Criterion ◽  
Crack Tip ◽  
Crack Tip Field ◽  
Elastic Plastic

EFFECT OF MECHANICAL PROPERTY MISMATCH ON FAILURE ASSESSMENT CURVE FOR WELDED JOINT WITH A SEMI-ELLIPTICAL CRACK

2013 ◽  
Vol 05 (03) ◽  
pp. 1350029 ◽  
Author(s):  
ZHONG-XIAN WANG ◽  
RUEI-FENG ZHANG ◽  
YUH J. CHAO ◽  
POH-SANG LAM
Keyword(s):  
Welded Joints ◽  
Fracture Criterion ◽  
Crack Depth ◽  
Safety Margin ◽  
Crack Tip ◽  
Elliptical Crack ◽  
Element Analysis ◽  
Crack Driving Force ◽  
Failure Assessment ◽  
Two Parameter

Elastic–plastic finite element analysis was performed to study the welded joints with a semi-elliptical crack. This research includes the effects of crack depth, strength mismatch ratio, and weld width on the crack driving force J-integral and the constraint parameter A2 at the crack tip. A two-parameter J-A2 fracture criterion based on the present results of crack tip stress field in the welded joints was established. The corresponding failure assessment diagrams were investigated in detail, from which the reliability and safety margin of the welded structures were discussed.

An Engineering Method for Assessing the Effects of Neutron Irradiation on the Fracture Toughness of RPV Steels

2011 ◽  
Author(s):  
Zhong-An Chen ◽  
L. Y. Wang ◽  
Yuh-Jin Chao ◽  
Poh-Sang Lam ◽  
X. S. Jin
Keyword(s):  
Fracture Toughness ◽  
Neutron Irradiation ◽  
Fracture Criterion ◽  
Crack Tip ◽  
Stress Fields ◽  
Fracture Toughness Test ◽  
Property Changes ◽  
Two Parameter ◽  
Reactor Pressure ◽  
Crack Tip Stress

Neutron irradiation degrades the reactor pressure vessel (RPV) steels. As the steel degrades, the mechanical properties of the material also change which affect the crack tip stress fields. In this article, we show that reduction of the “fracture toughness” of the RPV steels due to neutron irradiation can be interpreted by a change of an “equivalent constraint” due to material property changes. Using the J-A2 two-parameter fracture methodology to quantify the crack tip stress fields and a critical stress fracture criterion, the methodology is applied to the interpretation of fracture toughness test data from un-irradiated and irradiated RPV steels.

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.

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