| 基于有限元分析的表面裂纹应力强度因子的拟合估算 |
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| 引用本文： | 陈道礼.基于有限元分析的表面裂纹应力强度因子的拟合估算[J].机械设计与制造,2003(3):6-7. |
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| 作者姓名： | 陈道礼 |
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| 作者单位： | 武汉科技大学,武汉,430081 |
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| 摘 要： | 介绍了仅用非奇异单元建立表面裂纹三维有限元分析模型，直接根据裂纹前缘附近法向若干结点应力，用最小二乘法拟合估算I型应力强度因子的方法。这里的方法便于利用商品有限元软件的前处理工具对表面裂纹构件模型自动划分单元网格，并简化了应力强度因子的估算过程，有利于表面裂纹分析在工程中的推广应用。算例表明，该法可获得较好的精度。
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| 关 键 词： | 表面裂纹 应力强度因子 有限元分析 最小二乘法 拟合估算 非奇异单元 |
| 文章编号： | 1001-3997(2003)03-0006-02 |
| 修稿时间： | 2002年12月26 |
Fitting evaluation of stress intensity factor of surface crack based on FEA |
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| CHEN Dao -li.Fitting evaluation of stress intensity factor of surface crack based on FEA[J].Machinery Design & Manufacture,2003(3):6-7. |
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| Authors: | CHEN Dao -li |
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| Abstract: | An evaluation approach of I-type stress intensity factor for su rface cracks is presented in which only non -singular elements are used to build3-D FEA surface crack models and least squar e fitting method is used based on several node -stresses in the normal line direction of the crack front.The approach facilitat es automation of meshing for member mod els with surface cracks and simplifi es the evaluation process of stress intensity factor,which favors the a pplication extension of surface cra ck analysis in engineering.The exam ple shows good precision can be attained by the approach. |
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| Keywords: | Surface crack Stress intensity factor FEA Leased square method |
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