| 表面裂纹的三维模拟及应力强度因子计算 |
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| 引用本文： | 王永伟,林哲.表面裂纹的三维模拟及应力强度因子计算[J].中国海洋平台,2006,21(3):23-26. |
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| 作者姓名： | 王永伟 林哲 |
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| 作者单位： | 大连理工大学,大连,116023 |
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| 摘 要： | 考虑到裂纹前缘处的应力奇异性,在利用有限元方法计算平板表面裂纹的应力强度因子时,裂纹前缘采用三维四分之一分点20节点等参退化奇异单元。研究了裂纹前缘采用奇异单元的边长L与裂纹深度a之比L/a、围绕奇异单元层数R以及裂纹前缘每层单元划分的份数m(网格疏密)对计算结果的影响,并用无因次化的形状系数Y表示应力强度因子,分析结果与Newman-Raju公式计算结果基本相近。
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| 关 键 词： | 三维有限元分析 1/4节点位移法 应力强度因子 表面裂纹 |
| 文章编号： | 1001-4500(2006)03-0023-04 |
| 收稿时间： | 2005-12-27 |
| 修稿时间： | 2005年12月27 |
3-D SIMULATION AND STRESS INTENSITY FACTORS CALCULATION OF SURFACE CRACK |
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| WANG Yongwei,LIN Zhe.3-D SIMULATION AND STRESS INTENSITY FACTORS CALCULATION OF SURFACE CRACK[J].China offshore Platform,2006,21(3):23-26. |
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| Authors: | WANG Yongwei LIN Zhe |
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| Affiliation: | Dalian University of Technology,Dalian 116024,China |
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| Abstract: | Owing to the existence of the stress singularities on the crack tip,stress intensity factors of plate surface crack are calculated by three-dimensional finite element method,and 3-D prismatic quarter point 20-node isoparametric degenerate paradoxical elements are used for the region near the crack tip.This paper discusses the ratio of the length of 1st element(L)to crack depth(a) of the crack front,the effect of the rings of element(R) and every ring of element mesh density(m) round the crack front on the calculated results and the representation of the stress intensity factors by dimensionless shape factors(Y).The analytic results are in the proximity of the calculated results by Newman-Raju formula. |
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| Keywords: | three-dimensional finite element analysis quarter point displacement method stress intensity factors surface crack |
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