Development of strain gages to analyze the stress intensity factor of a crack tip
Development of strain gages to analyze the stress intensity factor of a crack tip
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开发应变计来分析裂纹尖端的应力强度因子
DOI：
10.1299/transjsme.14-00535
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
J. Shimura
中科院分区：
文献类型：
--
作者：
S. Kurosaki;S. Yamaji;R. Kobari;Mitsutaka Kanehira;T. Shimura;J. Shimura
目前有一种或两种应变片来测量应力强度因子。用这些应变计分析应力强度因子有时并不容易。本文报道了我们研制的新型应变片，使应力强度因子的测量更加简便实用。本文介绍了该应变计用于测量应力强度因子的以下特点。(1)利用裂纹尖端应变εr计算应力强度因子。(2)更具体地说，我们采用了该系列的第一和第二项的应变分量εr周围的裂纹尖端的应力强度因子的评估。采用我们研制的应变片的计算方法不需要裂纹长度。将新研制的应变片粘贴在试件裂纹尖端附近，裂纹为张开型或混合型。我们对与量规粘合的试件进行了拉伸试验。结果表明，所研制的应变片能够测量应力强度因子，误差在分析值的±10%以内。
There are currently one or two kinds of strain gages to measure the stress intensity factor. It might not be sometimes easy to analyze the stress intensity factor with those gages. In this paper, it is reported that our development of the new stain gage enables us to measure the stress intensity factor more easily and practically. The following features of this strain gage to evaluate the stress intensity factor are presented in this paper. (1) Strain component εr measured around the crack tip is used to calculate the stress intensity factor. (2) To be more specifically, we employed the first and second terms of the series at the strain component εr around the crack tip for an evaluation of the stress intensity factor. The calculation method with using our developed strain gage does not require the crack length. The newly developed strain gage was bonded to around the crack tip of the specimens, where cracks were of the opening mode or the mixed mode. We carried out tensile tests on the test pieces bonded with the gage. In conclusion, the results indicate that the developed strain gage enables us to measure stress intensity factor with an error margin within ±10% of the analytical values.