| 非均质焊接接头的裂纹尖端拘束与J积分应用的可行性 |
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| 引用本文： | 康继东 张玉凤. 非均质焊接接头的裂纹尖端拘束与J积分应用的可行性[J]. 天津大学学报(自然科学与工程技术版), 1996, 29(5): 699-703 |
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| 作者姓名： | 康继东 张玉凤 |
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| 摘 要： | 采用弹塑性大变形有限元方法，分析了平面应力状太民下非均质焊接接头中以应力三轴度表征的裂纹尖端拘束。结果表明，接头中裂纹尖端拘束不能满足ＨＲＲ场要求而显示出与接头区配、裂纹长度和裂纹模型有关的复杂演化规律。因此，在焊接接头直接应用Ｊ积分作为断裂参量存有问。
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| 关 键 词： | 焊接接头 裂纹尖端拘束 J积分 有限元 |
CRACK TIP CONSTRAINT AND APPLICATION FEASIBILITY OF J INTEGRAL IN HETEROGENEOUS WELDED JOINTS |
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| Kang Jidong Zhang Yufeng Huo Lixing. CRACK TIP CONSTRAINT AND APPLICATION FEASIBILITY OF J INTEGRAL IN HETEROGENEOUS WELDED JOINTS[J]. Journal of Tianjin University(Science and Technology), 1996, 29(5): 699-703 |
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| Authors: | Kang Jidong Zhang Yufeng Huo Lixing |
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| Affiliation: | Dept. of Mechanical Eng. |
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| Abstract: | Crack tip constraint characterized by stress triaxiality for heterogeneous welded joints in a plane stress case is investigated in this paper by the elastic plastic finite deformation finite element method. The results show that the crack tip constraint in welded joints cannot satisfy the requirements of the HRR field but reveals the complicated evolution laws associated with weldmatching, crack size and crack model. Therefore, it is deubtful whether J integral can be directly used as a fracture parameter in welded joints. |
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| Keywords: | heterogeneous welded joints crack tip constraint J integral |
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