| 三维应力奇异单元自动生成的通用算法 |
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| 引用本文： | 赵怀瑞,;李强,;张向前,;宋占勋.三维应力奇异单元自动生成的通用算法[J].北方交通大学学报,2009(1):62-65. |
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| 作者姓名： | 赵怀瑞 ;李强 ;张向前 ;宋占勋 |
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| 作者单位： | [1]北京交通大学结构强度检测国家级认证中心,轨道车辆结构可靠性与运用检测技术教育部工程研究中心,北京100044; [2]河南商电铝业集团,商丘476000 |
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| 基金项目： | 国家“863”计划项目资助（2006AA042406） |
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| 摘 要： | 用1/4奇异单元模拟裂纹尖端奇异性已经成为断裂力学数值计算的重要手段.目前三维奇异单元主要是靠人工手动生成奇异节点,然后再生成单元,这种方法工作量大、效率低,尤其是对复杂结构或裂纹形状更是难以实现.这里研究了各种形状三维奇异单元自动化生成的通用算法,并编制了计算程序,最后通过算例验证了算法的正确性.
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| 关 键 词： | 算法 奇异单元 自动化生成 应力强度因子 断裂力学 |
General Algorithm for Automated Mesh of Three Dimensional Singular Element |
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| Institution: | ZHAO Huairui,LI Qiang,ZHANG Xiangqian,SONG Zhanxun(1.Laboratory for Structural Strength Testing(Beijing Jiaotong University),China National Accreditation Service for Conformity Assessment,Engineering Research Center of Structure Reliability and Operation Measurement Technology of Rail Guided Vehicles(Beijing Jiaotong University),Ministry of Education,Beijing 100044,China;2.Shangdian Aluminum Industry Group Corporation of Henan Province,Shangqiu 476000,China) |
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| Abstract: | 1/4 singular element is a important tool to simulate the stress field around crack tip.3D singular elements along the front edge of crack are inefficiently set mainly by hand.When the shape of structure or crack model is complex,this manual method is even impractical.In this paper,a general algorithm for automated mesh of three dimensional singular element is proposed.The practical application in ANSYS indicates that the program compiled following the above algorithm increases the modeling efficiency greatly.The stress intensity factor （SIF） error between theoretical calculation value and the result from FEM by J-Integral is 1.8%. |
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| Keywords: | algorithm singular element automated mesh stress intensity factor FEM |
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