摘要
将弹性变形能沿包含裂纹尖端塑性区圆形围线上的积分作为裂纹扩展驱动力,建立了一种新型的复合断裂判据。较之仅着眼于纹尖场某一点的最小应变能密度因子理论,新判据更多地顾及到了尖端场的全局。实验结果证明,本文所提出的复合型断裂判据是简便可行的。
The line integral of the elastic strain energy along a circlesurrounding the plastic zone at the crack tip is taken as a driving force for mixed crack growth and a new fracture criterion is suggested.The new criterion includes the integral features of the whole field,while the theory of minimum strain-energy-density factor considers only a single point in the crack tip field.The experimental results show that the new criterion is simple and feasible.
出处
《石油大学学报（自然科学版）》
CSCD
1991年第4期33-38,共6页
Journal of the University of Petroleum,China(Edition of Natural Science)
关键词
金属材料
裂纹
临界扩展
Metallic material
Mixed Crack
Crack growth
Critical growth
