区域分裂法用于抽油杆表面椭圆裂纹应力强度因子的三维有限元计算

The Stress Intensity Factor of Surker Rods by Using the Domain-decompsition and the Finite Element Method

本文用三维有限元方法求解抽油杆表面椭圆裂纹在拉伸载荷下的应力强度因子。采用区域分裂算法，由裂端２７节点奇异单元位移场可精确、连续地给出应力强度因子沿裂纹的变化．算例与数值计算吻合得很好，表明本文结果有较高的精度。

Abstract In this paper,the stress intensity factors for a semi-elliptic surface crack in surker rod under tension have studied by using the domian-decomposition method and the finite element method.The numerical results are agree well with the published calculate examples.So the stress intensity factors changing continually along crack lines are high accuracy.