Method of detecting the critical load at crack initiation with strain gage

机译：用应变计检测裂纹萌生时的临界载荷的方法

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This paper introduces a new method of detecting the critical load at the crack initiation with strain gage. The unloading effect caused by growth of mode I crack is analysized. The unloading boudary equation is conducted. Li's model which is based on theoretical analysis is established, and a test method of detecting the initiation of crack growth with strain gage is put forward. The correctness and feasibility of the method are proved by testing seven kinds of materials and hundreds of specimens. Especially, the initiation of s urface crack is successfully detected with the method, so that a difficult experiment problem in fracture mechanics is solved.

机译：本文介绍了一种使用应变计检测裂纹萌生时临界载荷的新方法。分析了由I型裂纹扩展引起的卸载效应。进行卸荷方程。建立了基于理论分析的李氏模型，提出了用应变片检测裂纹扩展开始的试验方法。通过对七种材料和数百个试样的测试，证明了该方法的正确性和可行性。特别是，通过该方法成功地检测到表面裂纹的产生，从而解决了断裂力学中的难题。

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来源
《Proceedings of Second international symposium on the role of engineering mechanics in the training of engineers(R-EMTE'98)》|1998年|p.260-264|共5页
会议地点 Beijing(CN);Beijing(CN)
作者
Li Yinsheng; Zang Shengyuan; An Xiaoning;
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原文格式 PDF
正文语种 eng
中图分类一般工业技术;
关键词
crack initiation; critical load; unlading zone; strain gage.;

机译：裂纹萌生临界负荷；松驰区应变计。;

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Method of detecting the critical load at crack initiation with strain gage

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