基于近年来在裂纹尖端塑性区内应力应变分布、损伤和断裂的塑性消耗特征等方面所做的研究工作，对传统断裂准则进行了改进，提出一种考虑了构件几何及应力三轴性的新的断裂准则．由一系列几何尺寸的紧凑拉伸试验的验证表明，理论预言与实验测量结果符合得很好． Based on the research on the stress and strain distribution in the plastic zone at the crack tip and the plastic consumption characteristics of the damage and fracture in recent years, the traditional fracture criterion is improved. A new parameter considering the triaxiality of the member geometry and stress is proposed The fracture criterion. Validation of a series of compact tensile tests of geometrical dimensions shows that theoretical predictions are in good agreement with experimental measurements.