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

Burnley, Pamela C

doi:10.2138/am-2015-5234CCBYNCND

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

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Abstract

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.

Authors:

^[1]

Univ. of Nevada, Las Vegas, NV (United States)

Publication Date:: Wed Jul 01 00:00:00 EDT 2015

Research Org.:: Univ. of Nevada, Las Vegas, NV (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA)

Contributing Org.:: National Synchrotron Light Source; Brookhaven National Laboratory; Consortium for Materials Properties Research in Earth Sciences

OSTI Identifier:: 1332345

Grant/Contract Number:: NA0001982

Resource Type:: Accepted Manuscript

Journal Name:: American Mineralogist

Additional Journal Information:: Journal Volume: 100; Journal Issue: 7; Journal ID: ISSN 0003-004X

Publisher:: Mineralogical Society of America

Country of Publication:: United States

Language:: English

Subject:: 58 GEOSCIENCES; 36 MATERIALS SCIENCE; High-pressure studies; olivine; deformation; XRD data; synchrotron X‑ray; diffraction

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                    Burnley, Pamela C. Elastic plastic self-consistent (EPSC) modeling of plastic deformation in fayalite olivine.  United States: N. p., 2015. 
Web.  doi:10.2138/am-2015-5234CCBYNCND.

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                    Burnley, Pamela C. Elastic plastic self-consistent (EPSC) modeling of plastic deformation in fayalite olivine.  United States.  https://doi.org/10.2138/am-2015-5234CCBYNCND

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                    Burnley, Pamela C. Wed .  
"Elastic plastic self-consistent (EPSC) modeling of plastic deformation in fayalite olivine".  United States.  https://doi.org/10.2138/am-2015-5234CCBYNCND.  https://www.osti.gov/servlets/purl/1332345.

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@article{osti_1332345,

  title        = {Elastic plastic self-consistent (EPSC) modeling of plastic deformation in fayalite olivine},

  author       = {Burnley, Pamela C},

  abstractNote = {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.},

  doi          = {10.2138/am-2015-5234CCBYNCND},

  journal      = {American Mineralogist},

  number       = 7,

  volume       = 100,

  place        = {United States},

  year         = {Wed Jul 01 00:00:00 EDT 2015},

  month        = {Wed Jul 01 00:00:00 EDT 2015}

}

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