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.
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