Computational micromechanics of ductile fracture in duplex periodic microstructures

Ikumu Watanabe; Tianwen Tan

doi:10.1016/j.mtcomm.2026.116014

ジャーナル論文 Computational micromechanics of ductile fracture in duplex periodic microstructures

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Ikumu Watanabe, Tianwen Tan. Computational micromechanics of ductile fracture in duplex periodic microstructures. Materials Today Communications. 2026, 56 (), 116014. https://doi.org/10.1016/j.mtcomm.2026.116014

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(abstract)

Controlling microstructural heterogeneity is a promising strategy for tailoring the mechanical properties of multi-constituent materials. In particular, constituent connectivity, including the continuity of stiff or high-strength constituents, has attracted considerable interest in computational micromechanics. Although recent advances have enabled detailed analyses of complex microstructures, the micromechanical mechanisms governing their nonlinear deformation and fracture behavior remain insufficiently understood. In this study, three-dimensional numerical material testing, combining finite element analysis with a plasticity-induced damage model, is employed to investigate the relationship between constituent morphology and ductile fracture in duplex periodic microstructures. The analyzed microstructures contain continuous or discrete high-strength constituents over a wide range of volume fractions. The results show that both constituent volume fraction and connectivity affect macroscopic yielding, whereas fracture behavior exhibits a particularly strong sensitivity to connectivity. Specifically, the continuity of the low-strength matrix substantially affects damage localization, tensile strength, and elongation. When the low-strength constituent forms a continuous matrix, plastic deformation and damage preferentially localize within that matrix. Consequently, macroscopic fracture can occur before the strengthening effect of a large volume fraction of the discrete high-strength constituent is fully realized. These results demonstrate that constituent volume fraction alone is insufficient to characterize the ductile fracture behaviorof the periodic microstructures investigated in this study. The findings provide micromechanical insight into the distinct roles of constituent volume fraction, morphology, and connectivity and may contribute to the morphology-based design of heterogeneous materials with improved mechanical performance.

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