7JONES R, PENG D. A simple methpd for computing the stress intensity factors for cracks at notches[J]. Engineering Failure Analysis, 2002(9): 683-702.
8YAN Xiangqiao. An empirical formula for stress intensity factors of cracks emanating from a circular hole in a rectangular plate in tension[J]. Engineering Failure Analysis, 2007, 14: 935-940.