摘要
在应用断裂力学和塑性力学对裂纹顶端的分析基础上,提出了裂纹顶端塑性区内方向应变能的概念,并建立了基于此概念上的裂纹扩展准则,引入裂纹顶端临界扩展本征区概念,消除了应变能积分中的奇异性.与其它裂纹扩展准则的比较结果表明,在此基础上建立的裂纹扩展准则是合理可行的.
A new concept of strain energy along radius from crack tip within plastic zone is presented based on the analysis of deformation behavior of crack tip by the theory of fracture mechanics and plastic mechanics ,and a new criterion of crack propagation is proposed. In order to avoid the singularities in energy integral in the criterion of crack propagation ,a concept of critical intrinsic zone of crack propagation is introduced in this study. Through a comparison between the experimental data and those of other theories, the criterion of crack propagation proposed in the paper is sound and reasonable.
基金
国家自然科学基金资助项目(10272033)
关键词
复合型裂纹
端塑性区内方向应变能
裂纹扩展准则
mixed mode crack
strain energy along radius from crack tip in plastic zone
criterion of crack propagation
