Experimental Stress Separation Technique Using Thermoelasticity and Photoelasticity and Its Application to Fracture Mechanics
Experimental Stress Separation Technique Using Thermoelasticity and Photoelasticity and Its Application to Fracture Mechanics
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DOI：
10.1299/jsmea.47.298
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发表时间：
2004-07
期刊：
影响因子：
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通讯作者：
T. Sakagami;S. Kubo;Yasuyuki Fujinami;Y. Kojima
中科院分区：
文献类型：
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作者：
T. Sakagami;S. Kubo;Yasuyuki Fujinami;Y. Kojima
本文介绍了热弹性和光弹性测量中全场应力分离的实验研究及其在应力强度因子和j积分估计中的应用。热弹性应力分析（TSA）和光弹性应力分析（PSA）已经发展成为应力分布的全场可视化方法。TSA法只能测量主应力之和，而PSA法只能测量主应力差。在本研究中，采用这两种方法开发的混合应力分离测量技术用于确定受机械载荷作用的中心裂纹板中所有单个应力分量的分布。根据得到的应力分布计算应力强度因子和j积分。在传统计算方法的基础上，提出了不使用裂纹尖端附近退化的实验应力分布数据进行j积分计算的近尖端专属域积分法。结果表明，该方法可以较准确地计算这些断裂力学参数。
This paper describes an experimental study on full-field stress separation from thermoelasticity and photoelasticity measurements and its application to estimation of stress intensity factor and the J-integral. Thermoelastic stress analysis (TSA) and photoelastic stress analysis (PSA) have been developed as full-field visualization methods of stress distribution. Only the sum of the principal stresses can be measured by TSA, while only the difference of the principal stresses can be measured by PSA. In this study, the hybrid stress separation measurement technique developed by the present authors using both of these methods was applied for determining distribution of all individual stress components in a center-cracked plate subjected to mechanical load. Stress intensity factor and the J-integral were calculated from the obtained stress distribution. In addition to the conventional calculation method, near-tip exclusive domain integral method was proposed, in which the J-integral was evaluated without using degraded experimental stress distribution data near the crack tip. It was found that these fracture mechanics parameters can be evaluated with good accuracies by the present technique.