Analysis of monotonic and cyclic crack tip plasticity for a stationary crack tip in a FCC crystal

Zirkle, Theodore

doi:10.1016/j.commatsci.2021.110954

Cited by 10 publications

(1 citation statement)

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“…For instance, while isotropic hardening was assumed in this work, future work applied to cyclic loading may consider kinematic hardening (e.g., the Ohno‐Wang hardening law 52 implemented in PRISMS‐Fatigue 17 ). Additional mechanisms such as backstress and dislocation substructure development 53 could affect the driving force values extracted from the probe paths and are possible topics for future work. It is noted that large twins were not observed in the experimental dataset 30 and was, therefore, not included as a deformation mechanism in the constitutive model.…”

Section: Resultsmentioning

confidence: 99%

Predicting microstructurally sensitive fatigue‐crack path in WE43 magnesium using high‐fidelity numerical modeling and three‐dimensional experimental characterization

Phung,

Greeley,

Yaghoobi

et al. 2023

Fatigue Fract Eng Mat Struct

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Microstructurally small fatigue‐crack growth in polycrystalline materials is highly three‐dimensional due to sensitivity to local microstructural features (e.g., grains). One requirement for modeling microstructurally sensitive crack propagation is establishing the criteria that govern crack evolution, including crack deflection. Here, a high‐fidelity finite‐element modeling framework is used to assess the performance and validity of various crack‐growth criteria, including slip‐based metrics (e.g., fatigue‐indicator parameters), as potential criteria for predicting three‐dimensional crack paths in polycrystalline materials. The modeling framework represents cracks as geometrically explicit discontinuities and involves voxel‐based remeshing, mesh‐gradation control, and a crystal‐plasticity constitutive model. The predictions are compared to experimental measurements of WE43 magnesium samples subject to fatigue loading, for which three‐dimensional grain structures and fatigue‐crack surfaces were measured post‐mortem using near‐field high‐energy x‐ray diffraction microscopy and x‐ray computed tomography. Findings from this work are expected to improve the predictive capabilities of simulations involving microstructurally small fatigue‐crack growth in polycrystalline materials.

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Section: Resultsmentioning

confidence: 99%