论文部分内容阅读
在弹塑性断裂研究中广泛地采用着J积分断裂判据,这种判据的基础是HRR理论。近些年来,一些研究者基于数值分析和试验研究对HRR理论的适用性进行了讨论。本文采用有限元方法对实际弹塑性材料的多种不同几何类型的裂纹试样在平面应力和平面应变条件下的裂纹尖端场进行了自弹性状态到深度全面屈服状态的范围广泛的数值分析。结果表明,仅仅在平面应力的条件下HRR理论的应用是肯定的。对于在平面应变条件HRR理论应用于弹塑性材料失效的原因进行了分析和讨论,并提出了在此情况下适用的双参数断裂判据。
The J-integral fracture criterion is widely used in elasto-plastic fracture studies. The basis of this criterion is the HRR theory. In recent years, some researchers have discussed the applicability of HRR theory based on numerical analysis and experimental research. In this paper, a finite element method is used to analyze a wide range of numerical values from the elastic state to the full depth yield state for crack tip fields of a variety of crack specimens of actual elastoplastic materials under different plane stress and plane strain. The results show that the application of HRR theory is only valid under the condition of plane stress. The reason why HRR theory is applied to elastoplastic failure under plane strain condition is analyzed and discussed. A two-parameter fracture criterion applicable in this case is proposed.