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- W4210361900 abstract "We present a phase-field formulation to model fatigue crack growth over large numbers of cycles. Building upon a recently introduced phase-field formulation by the authors, fatigue is modeled phenomenologically by degradation of the fracture toughness, treated as a spatiotemporally evolving material property, inside a region around the crack tip with size Rfatigue. The present formulation, however, treats cycle number N as a continuous variable, allowing for crack growth prediction over large numbers of cycles of experimental relevance in arbitrary geometries containing one or several cracks, as well as under various loading conditions. The phenomenological form of the degradation law is analytically motivated by first deriving a relationship between the crack growth rate per cycle da/dN and the stress intensity factor (SIF) variation amplitude ΔK in the sharp-interface limit where Rfatigue is much larger than the phase-field regularization length ξ. This relationship reproduces salient features of experimentally measured fatigue growth curves, including the existence of a minimum ΔK for growth, a power law over an intermediate range of ΔK, and a sharp increase of growth rate when the peak SIF value approaches the Griffith threshold Kc. Phase-field simulations are shown to reproduce similar growth curves with quantitative differences depending on the ratio Rfatigue/ξ. The ability of the model to predict realistic crack paths is demonstrated by various examples in two and three dimensions including crack kinking under mode I+II loading, “en-passant” interacting cracks, and crack twisting in a three-point bending geometry with mode I+II+III loading." @default.
- W4210361900 created "2022-02-08" @default.
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- W4210361900 date "2022-04-01" @default.
- W4210361900 modified "2023-10-17" @default.
- W4210361900 title "Phase-field modeling of continuous fatigue via toughness degradation" @default.
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- W4210361900 doi "https://doi.org/10.1016/j.engfracmech.2022.108255" @default.
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