确定应力强度因子的光弹性法与焦散线法

Comparison between the Techniques of Transmitted Caustics and Photoelasticity in Determining Stress Intensity Factors

以光弹性法及焦散线法的基本原理为基础 ,对两种方法在确定应力强度因子方面进行了比较。发现对于纯Ⅰ型裂纹问题 ,光弹性法的精度低于焦散线法的精度 ;对于Ⅰ Ⅱ混合型裂纹问题 ,就张开型应力强度因子而言 ,光弹性法的精度低于焦散线法的精度 ,而就滑移型应力强度因子而言 。

Based on the principles of transmitted caustics as well as photoelasticity, the two techniques in determining stress intensity factors (SIF) are compared. It is found that, for mode I cracks, the precision of photoelasticity technique is hi gher than that of caustic method. And for I-II mixed cracks, the precision of p hotoelasticity technique is lower than that of caustic method in determining ope ning mode SIF, but as for sliding mode SIF, the conclusion is contrary to the fo rmer.case.