Ductile failure of polymeric samples weakened by circular arc cracks is studied theoretically and experimentally in this research. Various arrangements of cracks with different arc angles are considered in the specimens such that crack tips experienced the mixed mode I/II loading conditions. Fracture tests are conducted on the multi-cracked specimens and their fracture loads are achieved. To provide the results, the equivalent material concept (EMC) is used in conjunction of dislocation method and a brittle fracture criterion such that there is no necessity for performing complex and time-consuming elastic-plastic damage analyses. Theoretical and experimental stress intensity factors are computed and compared with each other by employing the fracture curves which demonstrate the appropriate efficiency of proposed method to predict the tests results.

中文翻译：

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等效材料概念分析含多个圆弧裂纹的环氧树脂板的延性失效分析

本研究从理论和实验上研究了被圆弧裂纹削弱的聚合物样品的延性破坏。在试样中考虑了具有不同弧角的裂纹的各种布置，使得裂纹尖端经历了混合模式I / II加载条件。对多裂纹试样进行了断裂试验，并达到了断裂载荷。为了提供结果，等效材料概念（EMC）与位错方法和脆性断裂准则结合使用，因此无需进行复杂而耗时的弹塑性损伤分析。