Mixed mode crack growth behaviour considering plasticity-induced and roughness-induced closure

Wang, Shuancheng; Yang, Bing; Li, Jian; Zhou, Shuwei; Xiao, Shoune

doi:10.1016/j.engfracmech.2023.109430

Cited by 7 publications

(1 citation statement)

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“…While the crack initiation angle tends toward the maximum shear stress direction (MSS criterion) [ 6 ], the maximum crack tip opening displacement (COD criterion) shear component direction [ 7 ] and the plastic flow direction [ 8 ] when a crack initiates in a shear mode. The topic of I-II mixed mode fatigue crack growth has been widely studied, which focused on the crack driving force, the mixed mode fatigue fracture mechanism and the fatigue crack growth prediction model [ 9 , 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Study on Elastic Mixed Mode Fracture Behavior and II-III Coupling Effect

et al. 2023

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Mixed mode fracture is a widely studied topic, while the coupling effects of mixed mode cracking are unclear. In this paper, elastic fracture behaviors and the coupling effects of the mixed mode cracks are studied in detail based on the finite element method, experimental study and linear elastic fracture mechanics. Results show that there always exist II-III coupling effects at the crack tips of mixed mode cracks, which have many effects on the crack tip field and crack propagation behavior. It is found that a mode II component at the tip of a mixed mode crack is the main reason for crack deflection, while the mode III components show no effect. For any mixed mode crack, mode II components at the crack tip can be divided as that by mode II loading which causes plane crack propagation, and by the coupling effect which causes spatial crack propagation. On this basis, a new fracture criterion suitable for any mixed mode crack is proposed, combined with the coupling effect and the linear elastic superposition principle. The research in this paper provides a solution to the problem of an II-III coupling effect in mixed mode fracture research and further promotes the development of fracture mechanics.

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