自紧厚壁筒表面裂纹的应力强度因子研究

Calculation of Stress Intensity Factor about an Autofrettage Thick-walled Cylinder with an Internal Surface Crack

本文首先介绍了厚壁筒结构的基本计算模型和计算裂纹尖端应力强度因子的基本理论 ,接着利用边界元法计算了在均匀内压下不同厚壁筒内表面椭圆裂纹的应力强度因子 ,研究了其大小随椭圆裂纹不同而变化的规律 ,为厚壁筒结构的设计、制造以及疲劳寿命分析提供了许多有价值的参考资料。

In this paper,first,the basic theories of calculating stress intensity factors at a crack-tip by FEM are presented.Then,the stress intensity factors are calculated about thick-walled cylinders with various crack sizes and internal semi-elliptical surface cracks.Then,its change laws are studied.These researches in this paper are very valuable to designing,manufacturing and analyzing fatigue life about thick-walled cylinder structures.