The J Integral of a Slightly Curved Elasticity-plasticity Crack when Enduring Quasi Static Loads

作     者：YANG Da-peng CHEN Xi ZHAO Yao LI Tian-yun 

作者机构：Machanical Engineering DepartmentZhengzhou Technical College 

出 版 物：《International Journal of Plant Engineering and Management》 (国际设备工程与管理（英文版）)

年 卷 期：2014年第19卷第1期

页      面：6-11页

学科分类：08[工学] 080102[工学-固体力学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：supported by Research the National Natural Science Foundation of China under Grant No.91016026 

主　　题：curved crack quasi-static second order perturbation solution J Integral 

摘      要：The J Integral of an elastic-plastic curved crack under quasi-static loads has been mainly worked in the paper,and the J Integral has been calculated as a practical application of a second order perturbation method and theorem of surname KA where the effect of quasi-static applied stresses and normal and shear stresses on the boundaries of plasticity area are synthetically taken into consideration.A regular pattern of variations of the J Integral of an elastic-plastic curved crack with the variations of curved crack shape parameters under different quasi-static loads has been mainly carried *** and unity of a elastic-plastic fracture and linear elastic fracture has been demonstrated from the viewpoint of the mechanical parameter of the curved crack tip J *** elastic-plastic slightly curved crack tip J integral has been calculated approximately,an integral loop having been reasonably selected and continuity and unity of the fracture characteristic of centre penetration straight line crack and curved crack have been demonstrated.