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Title: Coordinate transformation methodology for simulating quasistatic elastoplastic solids

Abstract

Molecular dynamics simulations frequently employ periodic boundary conditions where the positions of the periodic images are manipulated in order to apply deformation to the material sample. For example, Lees-Edwards conditions use moving periodic images to apply simple shear. Here, we examine the problem of precisely comparing this type of simulation to continuum solid mechanics. We employ a hypo-elastoplastic mechanical model, and develop a projection method to enforce quasi-static equilibrium. We introduce a simulation framework that uses a fixed Cartesian computational grid on a reference domain, and imposes deformation via a time-dependent coordinate transformation to the physical domain. As a test case for our method, we consider the evolution of shear bands in a bulk metallic glass using the shear transformation zone theory of amorphous plasticity. We examine the growth of shear bands in simple shear and pure shear conditions as a function of the initial preparation of the bulk metallic glass.

Authors:
 [1]; ORCiD logo [2]
  1. Harvard Univ., Cambridge, MA (United States). John A. Paulson School of Engineering and Applied Sciences (SEAS)
  2. Harvard Univ., Cambridge, MA (United States). John A. Paulson School of Engineering and Applied Sciences (SEAS); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Computational Research Div.
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)
OSTI Identifier:
1580841
Grant/Contract Number:  
AC02-05CH11231; DMR-1409560; DMS-1753203
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review. E
Additional Journal Information:
Journal Volume: 101; Journal Issue: 5; Journal ID: ISSN 2470-0045
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; 97 MATHEMATICS AND COMPUTING; fluid mechanics; projection method; plasticity; elastoplasticity

Citation Formats

Boffi, Nicholas M., and Rycroft, Chris H. Coordinate transformation methodology for simulating quasistatic elastoplastic solids. United States: N. p., 2020. Web. doi:10.1103/physreve.101.053304.
Boffi, Nicholas M., & Rycroft, Chris H. Coordinate transformation methodology for simulating quasistatic elastoplastic solids. United States. https://doi.org/10.1103/physreve.101.053304
Boffi, Nicholas M., and Rycroft, Chris H. Fri . "Coordinate transformation methodology for simulating quasistatic elastoplastic solids". United States. https://doi.org/10.1103/physreve.101.053304. https://www.osti.gov/servlets/purl/1580841.
@article{osti_1580841,
title = {Coordinate transformation methodology for simulating quasistatic elastoplastic solids},
author = {Boffi, Nicholas M. and Rycroft, Chris H.},
abstractNote = {Molecular dynamics simulations frequently employ periodic boundary conditions where the positions of the periodic images are manipulated in order to apply deformation to the material sample. For example, Lees-Edwards conditions use moving periodic images to apply simple shear. Here, we examine the problem of precisely comparing this type of simulation to continuum solid mechanics. We employ a hypo-elastoplastic mechanical model, and develop a projection method to enforce quasi-static equilibrium. We introduce a simulation framework that uses a fixed Cartesian computational grid on a reference domain, and imposes deformation via a time-dependent coordinate transformation to the physical domain. As a test case for our method, we consider the evolution of shear bands in a bulk metallic glass using the shear transformation zone theory of amorphous plasticity. We examine the growth of shear bands in simple shear and pure shear conditions as a function of the initial preparation of the bulk metallic glass.},
doi = {10.1103/physreve.101.053304},
journal = {Physical Review. E},
number = 5,
volume = 101,
place = {United States},
year = {Fri May 08 00:00:00 EDT 2020},
month = {Fri May 08 00:00:00 EDT 2020}
}

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