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本文对根据光弹等色条纹测定应力强度因子的断裂分析两参数法进行了评述,指出了Irwin、Bradley和Kobayashi以及Smith方法的发展细节,并评述了上述三种方法的差异。理论条纹圈是在裂纹长度为2a的半无限板受双轴向加载时导出的。这些条纹圈用以与这三种分析法进行比较,并确定每种方法的精确性。这三种方法都给出了一个很接近应力强度因子的估算值,而Bradley-Kobayashi的差分程序所提供的K估算值最精确。但是,若测定误差变得过大(>2％)而分差方程又扩大了这些误差时,则宜用Irwin原先提出的方法予以估算。若等色条纹圈的倾斜角为70°≤θm≤136°,则可用两参数法测量K值,其误差在±5％;若θm超过此范围,就不应采用两参数方法了。
This paper reviews the fracture analysis two-parameter method based on the determination of the stress intensity factor of photoelastic isometric streaks, points out the development details of Irwin, Bradley and Kobayashi and Smith methods, and comments on the differences between the above three methods. Theoretical streaks are derived when a semi-infinite plate with a crack length of 2a is biaxially loaded. These stripes are used to compare with these three analyzes and to determine the accuracy of each method. All three methods give an estimate very close to the stress intensity factor, whereas the Bradley-Kobayashi differential procedure provides the most accurate K estimate. However, if the measurement error becomes too large (> 2%) and the difference equation expands these errors, it is advisable to estimate it using the method originally proposed by Irwin. If the equal-color streak ring tilt angle of 70 ° ≤ θm ≤ 136 °, you can use the two-parameter method to measure the K value, the error is ± 5%; If θm exceeds this range, it should not be used two-parameter method.