In the fracture assessment of 3c, J-integer is a very important parameter, which is also an important contents in the elastic-plasticfracturemechanics.
在3c级断裂评估中，J积分是一个非常重要的参量，也是研究弹塑性断裂力学的重要内容之一。
2
The exact solution of linear elastic fracturemechanics is suggested in this paper and the plastic zone of crack tip is calculated under the condition of strain-hardening of material.