A NEW STRAIN GAUGE FOR MEASURING THE STRESS INTENSITY FACTORS OF CRACKS
A NEW STRAIN GAUGE FOR MEASURING THE STRESS INTENSITY FACTORS OF CRACKS
复制标题
测量裂纹应力强度因子的新型应变计
DOI：
10.1080/02780898808962111
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发表时间：
1988
期刊：
影响因子：
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通讯作者：
H. Kitagawa
中科院分区：
文献类型：
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作者：
H. Ishikawa;H. Kitagawa
由于实际结构中荷载或位移的分布往往是复杂的，结构中的裂纹很难用通常的解析或数值方法来分析。本文提出了一种新的求解方法。在该方法中，电阻应变片被用来评估裂纹的应力强度因子，KI和KII。在考虑裂纹尖端弹性应力奇异性优势区的基础上，讨论了应变片的粘贴位置。为了应用该方法，研制了一种新型应变片，并对Ⅰ型和复合型裂纹问题进行了实验研究。得到了I型裂纹的KI值，具有较好的精度，这为本文方法对I型裂纹问题的适用性提供了实验保证。由于没有混合型裂纹问题的KI和KII的解析值，因此无法讨论通过本方法获得的实验值的准确性。
Since the distribution of loads or displacements in actual structures is often complicated, cracks in the structures cannot be easily analysed by usual analytical or numerical methods. In the present paper, a new method for the problem was proposed. In the method, an electric resistance strain gauge was used to evaluate stress intensity factors, KI and KII, of cracks. Based on the wnsidera'tion of the dominant region of elastic stress singularity of the crack tip, the location of the gauge to be bonded was discussed. For the application of the method, a strain gauge with'a new gauge pattern was made, and a few experiments with the gauge were carried out for the cases of mode I and mixed mode crack problems. The values of KI for mode I cracks were obtained with fairly good accuracy, which gave an experimental assurance of the applicability of the present method to mode I crack problems. Since there were no analytical values of KI and KII for the mixed mode crack problem, the accuracy of the experimental values obtained by the present method could not be discussed.