A method to generate conformal finite-element meshes from 3D measurements of microstructurally small fatigue-crack propagation [A method to generate conformal finite-element meshes from 3D measurements of microstructurally small fatigue-crack propagation: 3D Meshes of Microstructurally Small Crack Growth]
- Univ. of Utah, Salt Lake City, UT (United States). Dept. of Mechanical Engineering
- NASA Langley Research Center, Hampton, VA (United States)
- GE Global Research Center, Niskayuna, NY (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Carnegie Mellon Univ., Pittsburgh, PA (United States). Dept. of Physics
- Cornell Univ., Ithaca, NY (United States). School of Civil & Environmental Engineering
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.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE; National Science Foundation (NSF); US Air Force Office of Scientific Research (AFOSR)
- Grant/Contract Number:
- AC52-07NA27344; SC0002001; DGE-0707428
- OSTI ID:
- 1378514
- Report Number(s):
- LLNL-JRNL-648662
- Journal Information:
- Fatigue and Fracture of Engineering Materials and Structures, Vol. 39, Issue 6; ISSN 8756-758X
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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