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- Title
A method to generate conformal finite-element meshes from 3D measurements of microstructurally small fatigue-crack propagation.
- Authors
Spear, A. D.; Hochhalter, J. D.; Cerrone, A. R.; Li, S. F.; Lind, J. F.; Suter, R. M.; Ingraffea, A. R.
- Abstract
In an effort to reproduce computationally the observed evolution of microstructurally small fatigue cracks (MSFCs), a method is presented for generating conformal, finite-element (FE), volume meshes from 3D measurements of MSFC propagation. The resulting volume meshes contain traction-free surfaces that conform to incrementally measured 3D crack shapes. Grain morphologies measured using near-field high-energy X-ray diffraction microscopy are also represented within the FE volume meshes. Proof-of-concept simulations are performed to demonstrate the utility of the mesh-generation method. The proof-of-concept simulations employ a crystal-plasticity constitutive model and are performed using the conformal FE meshes corresponding to successive crack-growth increments. Although the simulations for each crack increment are currently independent of one another, they need not be, and transfer of material-state information among successive crack-increment meshes is discussed. The mesh-generation method was developed using post-mortem measurements, yet it is general enough that it can be applied to in-situ measurements of 3D MSFC propagation.
- Subjects
MATERIALS; FATIGUE cracks; MICROSTRUCTURE; X-ray diffraction; FINITE element method
- Publication
Fatigue & Fracture of Engineering Materials & Structures, 2016, Vol 39, Issue 6, p737
- ISSN
8756-758X
- Publication type
Article
- DOI
10.1111/ffe.12449