Phase Field Crystal Simulation in Nano-scale for Crack Extension with Pre-deformation

Abstract

Abstract: Crack propagation under tensile strain in samples with pre-deformation is simulated using phase field crystal(PFC) method. It shows that crack of sample without pre-deformation, under tensile strain, begins to crack due to strain concentration as strain reaches a critical value. For pre-deformed samples, crack starts to propagate at a less critical strain value, and the larger the pre-deformation, the faster and more obvious the crack growth. For samples with pre-deformation during early process of crack propagation, growth characteristics of expansion-turning direction-expansion are presented. The essence is that crack growth is extended by atomic bond alternative fracture in directions[√3,1] and[√3,-1] of primary and secondary atomic arrangement direction, which leads to zigzag edge of the crack. For samples with pre-deformation at later stage crack propagation present longer cleavage crack extension in directions along[√3,1] and[√3,-1]. And the larger the pre-deformation of sample, the quicker the expansion of cleavage crack.

Key words: micro crack, pre-deformation, phase field crystal, simulation experiment

CLC Number:

TG111

GAO Yingjun, YANG Ruilin, HUANG Lilin, LIU Yao. Phase Field Crystal Simulation in Nano-scale for Crack Extension with Pre-deformation[J]. CHINESE JOURNAL OF COMPUTATIONAL PHYSICS, 2017, 34(4): 453-460.

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