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Title: Elastic plastic self-consistent (EPSC) modeling of plastic deformation in fayalite olivine

Elastic plastic self-consistent (EPSC) simulations are used to model synchrotron X-ray diffraction observations from deformation experiments on fayalite olivine using the deformation DIA apparatus. Consistent with results from other in situ diffraction studies of monomineralic polycrystals, the results show substantial variations in stress levels among grain populations. Rather than averaging the lattice reflection stresses or choosing a single reflection to determine the macroscopic stress supported by the specimen, an EPSC simulation is used to forward model diffraction data and determine a macroscopic stress that is consistent with lattice strains of all measured diffraction lines. The EPSC simulation presented here includes kink band formation among the plastic deformation mechanisms in the simulation. The inclusion of kink band formation is critical to the success of the models. This study demonstrates the importance of kink band formation as an accommodation mechanism during plastic deformation of olivine as well as the utility of using EPSC models to interpret diffraction from in situ deformation experiments.
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  1. Univ. of Nevada, Las Vegas, NV (United States)
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
American Mineralogist
Additional Journal Information:
Journal Volume: 100; Journal Issue: 7; Journal ID: ISSN 0003-004X
Mineralogical Society of America
Research Org:
Univ. of Nevada, Las Vegas, NV (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Contributing Orgs:
National Synchrotron Light Source; Brookhaven National Laboratory; Consortium for Materials Properties Research in Earth Sciences
Country of Publication:
United States
58 GEOSCIENCES; 36 MATERIALS SCIENCE; High-pressure studies; olivine; deformation; XRD data; synchrotron X‑ray; diffraction
OSTI Identifier: