Systematic analysis of fracture in two-phase materials at all stages

Abstract eng:
Although multi-phase materials are widely used, the micro-mechanisms dominating fracture are only partially understood. This [Wtematically investigates this topic using computational models. An idealized microstructure is employed wherein a brittle hard phase and a ductile soft phase are randomly distributed. The idealization facilitates transparent analyses with well controlled variations. Three topics are considered: the competition between fracture initiation in either of the phases, and the effect of the local phase distribution on fracture initiation and on propagation. The results indicate that, depending on the macroscopic stress state, one of the phases dominates the fracture initiation. The local phase distribution determines where fracture initiates. Regions of hard phase in the tensile direction intersected by bands of the soft phase in the shear directions promote damage for both mechanisms. Voids then link-up through the soft phase, strongly influenced by the amount of hard phase and the phase contrast.

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