A novel three-dimensional notch fracture criterion via effective critical distances
A novel three-dimensional notch fracture criterion via effective critical distances
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DOI：
10.1016/j.ijmecsci.2024.109149
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发表时间：
2024-06
影响因子：
7.3
通讯作者：
M. Mirsayar;B. Shahbazian
中科院分区：
文献类型：
--
作者：
M. Mirsayar;B. Shahbazian
许多众所周知的断裂准则依赖于在纯模式加载条件下测量的模式无关参数，称为临界距离，传统上认为临界距离是代表断裂加工区尺寸的材料特性。最近的研究揭示了利用模式依赖的临界距离计算断裂准则的准确性显着提高的潜力。为了响应这一启示，最近引入了有效临界距离（ECD）的概念，并成功地研究了裂纹构件在面内和面外载荷条件下的理论和实验。在这项工作中，第一次，ECD的概念被引入V形和U形缺口，形成一个新的三维缺口断裂准则的基础上的最大主应变（MPSN）。断裂角和所提出的标准预测的断裂发生理论上相比，其他现有的标准，实验，在文献中提出的测试数据。结果表明，该准则能更准确地预测V型和U型缺口构件的I/II/III型复合型断裂行为，这突出了采用ECD概念构建三维断裂准则的深远意义。
Many well-known fracture criteria rely on a mode-independent parameter measured under pure modeIloading conditions, called the critical distance, which is traditionally considered a material property representing the size of the fracture processing zone. Recent studies have unveiled the potential for significantly increased accuracy in fracture criteria by utilizing a mode-dependent critical distance in calculations. In response to this revelation, the concept of effective critical distance (ECD) was recently introduced and successfully examined in cracked components under in-plane and out-of-plane loading conditions, both theoretically and experimentally. In this work, for the first time, the concept of ECD is introduced for V- and U-shaped notches to form a new three-dimensional notch fracture criterion based on the maximum principal strain (MPSN). The fracture angle and the onset of fracture predicted by the proposed criterion are theoretically compared to other existing criteria, and experimentally, to the test data presented in the literature. It is shown that the developed criterion can more accurately predict the mixed-modeI/II/IIIfracture behavior of V- and U-notched components which accentuates the profound significance of embracing the ECD concept in constructing three-dimensional fracture criteria.