三维裂纹前缘参数化网格模型研究  

Mesh parameterization models of three-dimensional crack front

作　　者：侯乐毅 唐俊星[2] 

机构地区：[1]中航工业金城南京机电液压研究中心,南京211106 [2]西北工业大学动力与能源学院,西安710072

出　　处：《燃气涡轮试验与研究》2017年第3期42-47,共6页Gas Turbine Experiment and Research

摘　　要：为实现三维疲劳裂纹扩展自动模拟及获得更高精度的应力强度因子,在实体参数化建模的基础上,自编程开发了两种参数化裂尖网格模型,分别对应奇异元法和虚拟裂纹扩展法(VCCT法)计算应力强度因子,且两种参数化网格可互换以便相互验证。两种裂纹模型均精心设计,裂纹前缘网格正交,过渡均匀,疏密可调。与解析解的对比结果表明,两种参数化网格模型均有很高的计算精度,可为一般工程结构获得较高精度的应力强度因子结果提供技术支持。To realize the automatic 3D crack fatigue propagation simulation and obtain higher accuracy ofstress intensity factor（SIF）, on the basis of the parametric entity modeling, two kinds of parametric mesh ofnear crack tip were developed, which corresponding to the singular element method and virtual crack clo-sure technique（VCCT） to calculate the SIF, and both parametric mesh were interchangeable for mutual au-thentication. Both crack models were carefully designed, using uniform transition orthogonal grid near thecrack tip, and density was adjustable also along the crack front. Compared with analytical solution results, itshows that both kinds of parametric grid model have high calculation precision, thus can provide a techni-cal support in achieving more accurate result of the SIF for a general engineering structure.

关 键 词：三维疲劳裂纹 裂纹扩展 虚拟裂纹扩展法 应力强度因子 参数化网格模型 奇异元法 

分 类 号：V231.9[航空宇航科学与技术—航空宇航推进理论与工程] O346.1[理学—固体力学]