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A two-parameter criterion for predicting the fracture location along a surface crack

机译：用于预测沿表面裂缝的裂缝位置的两个参数标准

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The fracture prediction for materials containing surface cracks is not well established. In this paper, a new two-parameter fracture criterion which can predict the location of maximum crack extension along a surface crack front was presented. The surface-cracked specimens with different crack sizes and loads were selected, and the finite element method (FEM) was used to model the J-integral and the equivalent plastic strain (epsilon(p)) distributions along the crack front for different specimens. And then, in succession, the areas A(PEEQ) surrounded by the epsilon(p) isoline ahead of crack tips under different J-integrals and the unified constraint parameter A(p) were calculated. Based on the parameter A(p), J-integral and the fracture toughness J(ref) measured in a standard test, the J/(J(ref)root A(p)), which considered the combined effects of crack driving force and material resistance force, was determined. The critical fracture location is the location for which the J/(J(ref)root A(p)) is a maximum. The results show that for all the specimens, the prediction results obtained by two-parameter criterion are consistent with the measured results obtained by experiments. The J/(J(ref)root A(p)) is a suitable prediction criterion to model the location of the maximum crack extension of surface crack. For comparison, similar predictions were also made using a single-parameter J-integral and root A(p). (C) 2017 Elsevier Ltd. All rights reserved.
机译：含有表面裂缝的材料的断裂预测不是很好的。在本文中，提出了一种新的双参数裂缝标准，其可以预测沿着表面裂纹前沿的最大裂缝延伸部的位置。选择具有不同裂纹尺寸和载荷的表面破裂的样品，并且有限元方法（FEM）用于模拟沿着裂缝前沿的J-积分和等效塑性菌株（epsilon（p））分布。然后，计算在不同J-Integlats和统一约束参数A（P）下的截至裂缝尖端的epsilon（P）中围绕的区域A（PEEQ）的区域A（PEEQ）。基于在标准测试中测量的参数A（P），J-Integral和裂缝韧性J（REF），J /（J（REF）根A（P）），其考虑了裂纹驱动力的组合效应和材料阻力，确定。临界断裂位置是J /（J（REF）根A（P））最大值的位置。结果表明，对于所有标本，通过双参数标准获得的预测结果与通过实验获得的测量结果一致。 J /（J（Ref）根A（P））是适当的预测标准，以模拟表面裂纹的最大裂缝延伸的位置。为了比较，还使用单个参数J-Integral和Root A（P）进行类似的预测。 （c）2017 Elsevier Ltd.保留所有权利。

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