Abstract This research presents the crack coalescence mode and physical field evolution characteristics of a brittle material containing two 3-D parallel embedded flaws. A numerical model based on the flat-joint model is established and validated by laboratory experiments. The crack coalescence modes of two 3-D parallel flaws with different geometries are summarized. The physical field evolution characteristics during the cracking process are investigated. The mechanisms of wing crack initiation and propagation are effectively reflected by the physical fields. Moreover, the impacts of the interactions between the two flaws on the crack coalescence mode and physical fields are analysed. The simulation results indicate that the flat-joint model is appropriate for simulating the cracking process of two 3-D flaws in a brittle material. The flaw dislocation O can reflect the interaction strength. A strong interaction promotes the earlier fracture of the rock bridge, which also significantly weakens the mechanical properties of the specimen. In general, the mechanism of wing crack initiation is tensile, and stable propagation occurs by mixed tension and shear. However, strong interactions between flaws have significant impacts on the physical fields within the rock bridge and concentrate the tensile and shear forces, which may induce wing crack initiation as mixed tensile and shear cracks.

中文翻译：

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含2个3维平行嵌入缺陷脆性材料的裂纹聚结模式及物理场演化特征

摘要 本研究展示了一种含有两个3-D平行嵌入缺陷的脆性材料的裂纹聚结模式和物理场演化特征。建立了基于平接头模型的数值模型，并通过实验室实验进行了验证。总结了具有不同几何形状的两个 3-D 平行缺陷的裂纹合并模式。研究了裂解过程中的物理场演化特征。物理场有效地反映了机翼裂纹萌生和扩展的机制。此外，分析了两个缺陷之间的相互作用对裂纹合并​​模式和物理场的影响。仿真结果表明，平接头模型适用于模拟脆性材料中两个三维裂纹的开裂过程。缺陷位错O可以反映相互作用强度。强相互作用促进了岩桥的早期断裂，这也显着削弱了试件的力学性能。一般情况下，翼裂纹的萌生机理是拉伸，在拉剪混合作用下发生稳定扩展。然而，缺陷之间的强相互作用对岩桥内的物理场有显着影响，并集中了拉力和剪切力，这可能导致翼裂纹萌生为拉剪切混合裂纹。通过混合张力和剪切力发生稳定的传播。然而，缺陷之间的强相互作用对岩桥内的物理场有显着影响，并集中了拉力和剪切力，这可能导致翼裂纹萌生为拉剪切混合裂纹。通过混合张力和剪切力发生稳定的传播。然而，缺陷之间的强相互作用对岩桥内的物理场有显着影响，并集中了拉力和剪切力，这可能导致翼裂纹萌生为拉剪切混合裂纹。