Abstract: Using finite element method, the nonlinear contact between a rigid punch and a elastic half plane was analyzed. Through modeling and computing with ANSYS, the value of J-integral around the edge of the punch was obtained. The conservation of J-integral was certificated by series of data. And the contact stress intensity factor (K_I) was gained through the relation between the J-integral and the K_I. The results indicate that the K_I by J-integral was in accord with the theoretical value. At last the KI of elastic plane with different thickness was calculated by the theory of J-integral.

Key words: ANSYS, Punch, J-integral, Stress-intensity factor

摘要： 采用有限元法对平端的刚性压头压在半无限大的弹性平面上进行非线性接触分析，应用有限元分析软件ANSYS建模，计算围绕压头端点的J积分值，通过数值计算证明其守恒性，再根据J积分与I型触压应力强度因子（K_I）的关系得到K_I。数据结果表明,由J积分方法计算的K_I与理论值一致。最后应用J积分理论计算了有限厚度的板在刚性压头作用下的应力强度因子。

关键词: ANSYS, 压头, J积分, 应力强度因子