A NEW CYCLIC J-INTEGRAL FOR LOW-CYCLE FATIGUE CRACK GROWTH

• Published in: Applied mathematics and mechanics Vol. 27; no. 2; pp. 149 - 160
• Main Author: 胡宏玖 郭兴明 李培宁 谢禹钧 李洁
• Format: Journal Article
• Language: English
• Published: Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University,Shanghai 200072, P. R. China%College of Mechanical Engineering, East China University of Science and Technology,Shanghai 200237, P. R. China 01.02.2006
• Subjects: Computer simulation; Crack propagation; Fatigue (materials); Fatigue failure; Fracture mechanics; J integral; Low cycle fatigue; Mathematical models; 低周期疲劳; 循环J积分; 数字评估; 构成方程; 疲劳裂纹; numerical evaluation; constitutive equation; low-cycle fatigue; fatigue retardation; cyclic J-integral
• ISSN: 0253-4827; 1573-2754
• DOI: 10.1007/s10483-006-0202-z

The constitutive equation under the low-cycle fatigue （LCF） was discussed, and a two-dimensional （2-D） model for simulating fatigue crack extension was put forward in order to propose a new cyclic J-integral. The definition, primary characteristics, physical interpretations and numerical evaluation of the new parameter were investigated in detail. Moreover, the new cyclic J-integral for LCF behaviors was validated by the compact tension （CT） specimens. Results show that the calculated values of the new parameter can correlate well with LCF crack growth rate, during constant-amplitude loading. In addition, the phenomenon of fatigue retardation was explained through the viewpoint of energy based on the concept of the new parameter.