复合型疲劳试验与折线裂纹强度因子计算

Complex fatique test and calculations of stress intensity factor of bent crack

摘要: 本文用三点弯曲偏裂纹试样研究了Ⅰ—Ⅱ复合型裂纹的疲劳扩展。由于裂纹扩展呈折线形,所以首先研究了折线裂纹应力强度因子的计算方法,并对计算结果用有机玻璃进行了实验验证。从而可以对疲劳裂纹扩展的数据进行有效的整理,得以说明一些判据的可用性,并对有关问题进行讨论。

Abstract: In the research of facture mechanics, although straight line crack is the most simple and useful crack model,One of the reason is that straight line crack can expend and changeinto bent line crack in the complex stresses condition.it is difficulty to calculate the SIF of bent crack. so it is also difficulty to research co mplex fatique extention law.
In this paper, the bent cracks were studied by the calculation of the SIF of a bent crack which contained three bent point specimen, the computations that verified by experimenting was applied to the research of complex type fatique extension law.