| T型焊接接头中疲劳裂纹扩展的三维边界元模拟 |
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| 引用本文： | 李强,王波,李存铮,岑章志.T型焊接接头中疲劳裂纹扩展的三维边界元模拟[J].清华大学学报(自然科学版),2002,42(4):470-473. |
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| 作者姓名： | 李强 王波 李存铮 岑章志 |
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| 作者单位： | 1. 清华大学工程力学系,北京,100084
2. 南洋理工大学土木结构工程系,新加坡,639798 |
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| 基金项目： | 国家自然科学基金资助项目 ( 195 72 0 37) |
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| 摘 要： | T型焊接接头在钢结构中十分常见 ,它往往因初始微裂纹的疲劳扩展而导致断裂破坏。该文应用边界元( BEM)子域法 ,研究 T型焊接接头中三维混合模式表面裂纹的疲劳扩展问题。按照 T型焊接接头的实验模型建立边界元计算模型。基于端点附近裂纹前沿线位于椭球面上的假设 ,用间接方法求出裂纹前沿线的两个端点。当裂纹扩展时 ,计算网格可以自动进行重新划分。文中对裂纹扩展长度和方向提出了一种扩展准则 ,并与其他准则和实验结果进行了比较。计算结果表明 ,提出的扩展准则是有效的
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| 关 键 词： | 表面裂纹 疲劳扩展 T型接头 边界元方法 |
| 文章编号： | 1000-0054(2002)04-0470-04 |
| 修稿时间： | 2001年5月25日 |
3-D simulation of fatigue crack propagation in a T-shaped welded joint using the boundary element method |
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| LI Qiang,WANG Bo,LIE Seng Tjhen,CEN Zhangzhi.3-D simulation of fatigue crack propagation in a T-shaped welded joint using the boundary element method[J].Journal of Tsinghua University(Science and Technology),2002,42(4):470-473. |
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| Authors: | LI Qiang WANG Bo LIE Seng Tjhen CEN Zhangzhi |
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| Abstract: | T shaped welded joints are used commonly in steel structures. Their collapse mechanism will be rupture collapse due to the propagation of initial mini cracks. A general procedure was developed to investigate 3 D mixed mode fatigue surface crack growth using the multi region boundary element method (BEM). A BEM model for a welded T joint was constructed for a test specimen. The crack corner points were indirectly modeled using the assumption that the crack front near the crack corner points lies on the surface of an ellipse. As the crack propagates, the mesh was automatically regenerated. A criterion for the crack extension rate and direction is proposed and compared with other criteria. Numerical results from the welded T joint show that the criterion is useful. |
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| Keywords: | surface crack fatigue propagation T joint boundary element method (BEM) |
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