小角裂纹应力强度因子的权函数解

本文把作者近年来发展的三维权函数法推广应用于平板角裂纹问题,计算了含小角裂纹的平板受远方拉伸及弯曲载荷下的应力强度因子,所提供的解答覆盖了疲劳断裂的研究及工程应用中所关心的小角裂纹的范围。本文的解与文献中的有限元结果进行了广泛的比较,两者之间有极好的一致性。

SOLUTION OF STRESS INTENSITY FACTORS BY WEIGHT FUNCTION FOR SMALL CORNER CRACKS IN PLATES

The three-dimensional weight function method developed in 2,3] is usedto determine stress intensity factors for small corner cracks in plates subjected to remote tension and bending. The geometry parameters considered are c/b=0.1;a/c = 0.2,0.4,0.6, l,2;a/t = 0.01,0.05,0.1 and 0.2, which cover the range of small surface crack problems commonly encountered in fatigue and fracture studies and applications. The results are compared with the finite element solutions in 1] . Very good agreement is observed. The results presented in this paper should be useful in damage tolerance and durability analysis of aircraft structures and in the study of small fatigue cracks.