A surface-mesh gradation tool for generating gradated tetrahedral meshes of microstructures with defects

Phung, Brian R.; He, Junyan; Spear, Ashley D.

doi:10.1016/j.commatsci.2021.110622

Cited by 3 publications

(6 citation statements)

References 39 publications

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“…A previously developed voxel‐based remeshing framework with mesh‐gradation control 31,32 is used to assess the performance and validity of potential crack‐deflection criteria in the underaged magnesium WE43 datasets. Before describing the specific application of the framework to the experimental datasets, a general overview of the framework is provided and summarized in Figure 3.…”

Section: Methodsmentioning

confidence: 99%

“…From here, the process repeats to simulate new increments of crack growth. The reader is referred to previous studies 31,32 for additional details about the crack-simulation framework.…”

Section: Magnesium We43 Thin-foil Samplesmentioning

confidence: 99%

“…The objective of this work is two-fold: (1) to demonstrate the capability of the recently implemented highfidelity, crack-simulation framework 31,32 applied to experimentally measured microstructures of underaged magnesium WE43 8,30 and (2) to assess the performance of several potential crack-deflection criteria for predicting three-dimensional fatigue-crack path in the experimentally measured microstructures.…”

Section: Introductionmentioning

confidence: 99%

“…To account for micromechanical fields ahead of the crack front, the authors previously developed a voxel‐based remeshing framework 31 to represent and propagate complex three‐dimensional cracks through heterogeneous (viz., polycrystalline) materials. The authors later implemented a mesh‐gradation tool focused specifically on microstructures with defects (e.g., cracks) 32 to reduce the computational expense associated with crystal‐plasticity constitutive modeling and high‐resolution finite‐element (FE) meshes. These tools and modern high‐performance computing make the investigation of crack‐deflection criteria in three‐dimensional polycrystals computationally tractable.…”

Section: Introductionmentioning

confidence: 99%

“…General overview of cracksimulation framework and constitutive model2.2.1 | Model generation and crack propagationA previously developed voxel-based remeshing framework with mesh-gradation control31,32 is used to assessF I G U R E 2 (A)Magnesium WE43 cylindrical fatigue sample from Adams. 8 (B) Two halves extracted from the fatigue-failed cylindrical fatigue sample imaged with near-field HEDM, with accompanying crack surface imaged with x-ray CT. (C) Voxel-based volume of approximated uncracked microstructure.…”

mentioning

confidence: 99%

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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: Methodsmentioning

confidence: 99%

“…From here, the process repeats to simulate new increments of crack growth. The reader is referred to previous studies 31,32 for additional details about the crack-simulation framework.…”

Section: Magnesium We43 Thin-foil Samplesmentioning

confidence: 99%