skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

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]

Journal Article · · Fatigue and Fracture of Engineering Materials and Structures
DOI:https://doi.org/10.1111/ffe.12449· OSTI ID:1378514
 [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

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
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

References (31)

New opportunities for 3D materials science of polycrystalline materials at the micrometre lengthscale by combined use of X-ray diffraction and X-ray imaging journal October 2009
A perspective on trends in multiscale plasticity journal September 2010
Forward modeling method for microstructure reconstruction using x-ray diffraction microscopy: Single-crystal verification journal December 2006
High-energy diffraction microscopy at the advanced photon source journal July 2011
Influence of microstructure variability on short crack behavior through postulated micromechanical short crack driving force metrics journal April 2015
Microstructure-sensitive computational modeling of fatigue crack formation journal September 2010
Finite element formulation for modelling large deformations in elasto-viscoplastic polycrystals journal July 2004
Experimental and computational studies of low cycle fatigue crack nucleation in a polycrystal journal February 2007
A geometric approach to modeling microstructurally small fatigue crack formation: I. Probabilistic simulation of constituent particle cracking in AA 7075-T651 journal August 2008
Microstructure-based multistage fatigue modeling of aluminum alloy 7075-T651 journal November 2007
Effect of 3D grain structure representation in polycrystal simulations journal October 2012
Three-dimensional finite element analysis using crystal plasticity for a parameter study of microstructurally small fatigue crack growth in a AA7075 aluminum alloy journal April 2009
Predicting fatigue crack initiation through image-based micromechanical modeling journal March 2007
Finite element modeling of microstructurally small cracks using single crystal plasticity journal September 2003
Microstructure-based fatigue modeling of cast A356-T6 alloy journal January 2003
A geometric approach to modeling microstructurally small fatigue crack formation: III. Development of a semi-empirical model for nucleation journal March 2011
Observations of Intergranular Stress Corrosion Cracking in a Grain-Mapped Polycrystal journal July 2008
Driving forces for localized corrosion-to-fatigue crack transition in Al-Zn-Mg-Cu: CORROSION-TO-FATIGUE CRACK TRANSITION IN Al-Zn-Mg-Cu journal May 2011
3-D growth of a short fatigue crack within a polycrystalline microstructure studied using combined diffraction and phase-contrast X-ray tomography journal January 2011
A time integration algorithm for elasto-viscoplastic cubic crystals applied to modelling polycrystalline deformation journal November 1992
Effect of initiation feature on microstructure-scale fatigue crack propagation in Al–Zn–Mg–Cu journal September 2012
Effect of corrosion severity on fatigue evolution in Al–Zn–Mg–Cu journal February 2010
The role of heterogeneous deformation on damage nucleation at grain boundaries in single phase metals journal September 2009
Estimating fatigue sensitivity to polycrystalline Ni-base superalloy microstructures using a computational approach journal October 2007
Strain localization at the crack tip in single crystal CT specimens under monotonous loading: 3D Finite Element analyses and application to nickel-base superalloys journal November 2003
A geometric approach to modeling microstructurally small fatigue crack formation: II. Physically based modeling of microstructure-dependent slip localization and actuation of the crack nucleation mechanism in AA 7075-T651 journal March 2010
Three-dimensional characterization of microstructurally small fatigue-crack evolution using quantitative fractography combined with post-mortem X-ray tomography and high-energy X-ray diffraction microscopy journal September 2014
Adaptive reconstruction method for three-dimensional orientation imaging journal March 2013
Three-dimensional in situ observations of short fatigue crack growth in magnesium journal October 2011
Fatigue crack formation and growth from localized corrosion in Al–Zn–Mg–Cu journal March 2009
Three-dimensional crack-tip fields in four-point-bending copper single-crystal specimens journal June 1996

Cited By (4)