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- Title
Predicting microstructurally sensitive fatigue‐crack path in WE43 magnesium using high‐fidelity numerical modeling and three‐dimensional experimental characterization.
- Authors
Phung, Brian R.; Greeley, Duncan A.; Yaghoobi, Mohammadreza; Adams, Jacob F.; Allison, John E.; Spear, Ashley D.
- Abstract
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. Highlights: The performance of potential crack‐deflection criteria are assessed for 3D short‐crack paths.The predictions are compared to experimental measurements of fatigue‐failed WE43 magnesium samples.Blind predictions based on FIP distributions were most sensitive to the local microstructure.These findings expected to improve the predictive capabilities of short‐crack simulations.
- Subjects
THREE-dimensional modeling; MAGNESIUM; CRACK propagation (Fracture mechanics); FATIGUE cracks; X-ray microscopy; COMPUTED tomography; FATIGUE crack growth
- Publication
Fatigue & Fracture of Engineering Materials & Structures, 2024, Vol 47, Issue 3, p862
- ISSN
8756-758X
- Publication type
Article
- DOI
10.1111/ffe.14210