基于<i>J</i>-<i>Q</i>双参数准则的材料裂纹体失效评定曲线工程化研究

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基于J-Q双参数准则的材料裂纹体失效评定曲线工程化研究

基金项目:

陕西省教育厅自然科学基金资助项目(01JK134)

1.School of Material Science and Engineering,Xian University of Technology,710048,China; 2.Wuhan Iron and Steel (Group) Corporation,430083,China

摘要: 针对应力三轴性对裂纹尖端应力应变场的影响,讨论了均匀材料裂纹体的断裂准则,建立了基于J-Q双参数准则的失效评定曲线。利用有限元数值解的结果,得到了失效评定曲线中各参量的工程估算方法。通过实例,对本文所建立失效评定曲线的计算方法和现有的计算途径进行了比较。
- 失效评定曲线 /
- J-Q双参数准则 /
- 断裂参量 /
- 有限元法
Abstract: Considering the influence of stress-triaxiality on stress-strain field near crack tip, the theory that used to access the integrity of homogeneous materials has been discussed in this paper. In addition, the failure assessment curves of cracked structure based on double-parameter J～Q criterion are founded. By utilizing the finite element numerical results, the engineering treatment methods of each factor in the failure assessment curves are obtained. In the end, calculatiion approach for the failure assessment curves set up in this paper has been compared with the available procedure.
- Failure assessment curves /
- Double-parameter J-Q criterion /
- Fracture criterion /
- Finite element method