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Title: 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]

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.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [4] ;  [5] ;  [6]
  1. Univ. of Utah, Salt Lake City, UT (United States). Dept. of Mechanical Engineering
  2. NASA Langley Research Center, Hampton, VA (United States)
  3. GE Global Research Center, Niskayuna, NY (United States)
  4. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  5. Carnegie Mellon Univ., Pittsburgh, PA (United States). Dept. of Physics
  6. Cornell Univ., Ithaca, NY (United States). School of Civil & Environmental Engineering
Publication Date:
Report Number(s):
LLNL-JRNL-648662
Journal ID: ISSN 8756-758X
Grant/Contract Number:
AC52-07NA27344; SC0002001; DGE-0707428
Type:
Accepted Manuscript
Journal Name:
Fatigue and Fracture of Engineering Materials and Structures
Additional Journal Information:
Journal Volume: 39; Journal Issue: 6; Journal ID: ISSN 8756-758X
Publisher:
Wiley
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE; National Science Foundation (NSF); US Air Force Office of Scientific Research (AFOSR)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 97 MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; aluminium; multiscale modelling; numerical simulation; short crack propagation; X-ray diffraction
OSTI Identifier:
1378514