Dynamic crack curving and branching in line-pipe
Dynamic crack curving and branching in line-pipe
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管线管动态裂纹弯曲和分支
DOI：
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发表时间：
1982
期刊：
影响因子：
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通讯作者：
B. Kang
中科院分区：
文献类型：
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作者：
M. Ramulu;A. Kobayashi;B. Kang
对新近提出的动态裂纹弯曲准则和裂纹分叉准则进行了简要的评述。用细观力学模型对这两个判据进行了验证，并用来预测Homalite-100断裂试件的动态光弹实验中的裂纹弯曲和裂纹分支。后一种裂纹分叉判据要求临界动应力强度因子K/sublb/作为必要条件，并伴随有涉及前一种裂纹分叉判据的充分条件。Congleton(26)和Almond等人对爆裂钢管的动态有限元分析进一步验证了这一准则。(27)，其中数值计算的分枝应力强度因子和分支角与实验结果吻合较好。
The newly derived dynamic crack curving and crack branching criteria are briefly reviewed. The two criteria are justified by a micro-mechanics model and are used to predict crack curving and crack branching of dynamic photoelastic experiments involving Homalite-100 fracture specimens. The latter crack branching criterion requires as a necessary condition a critical dynamic stress intensity factor, K /SUB lb/ , which is accompanied by a sufficient condition involving the former crack curving criterion. This criteria is further verified by a dynamic finite element analysis of a bursting steel pipe of Congleton (26) and Almond, et al. (27), where the numerically computed branching stress intensity factor and branching angle are in good agreement with experimental results.