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A Finite-Deformation Constitutive Model of Bulk Metallic Glass Plasticity

Yang, Q. and Mota, A. and Ortiz, M. (2006) A Finite-Deformation Constitutive Model of Bulk Metallic Glass Plasticity. Computational Mechanics, 37 (2). pp. 194-204. ISSN 0178-7675. doi:10.1007/s00466-005-0690-5.

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A constitutive model of bulk metallic glass (BMG) plasticity is developed which accounts for finitedeformation kinematics, the kinetics of free volume, strain hardening, thermal softening, rate-dependency and non-Newtonian viscosity. The model has been validated against uniaxial compression test data; and against plate bending experiments. The model captures accurately salient aspects of the material behavior including: the viscosity of Vitreloy 1 as a function of temperature and strain rate; the temperature and strain-rate dependence of the equilibrium free-volume concentration; the uniaxial compression stress-strain curves as a function of strain rate and temperature; and the dependence of shear-band spacing on plate thickness. Calculations suggest that, under adiabatic conditions, strain softening and localization in BMGs is due both to an increase in free volume and to the rise in temperature within the band. The calculations also suggest that the shear band spacing in plate-bending specimens is controlled by the stress relaxation in the vicinity of the shear bands.

Item Type:Article
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URLURL TypeDescription ReadCube access
Ortiz, M.0000-0001-5877-4824
Additional Information:© Springer-Verlag Berlin Heidelberg 2005. Received: 28 November 2004 / Accepted: 8 April 2005 / Published online: 5 July 2005 We are grateful for support provided by Caltech’s NSF/MRSEC Center for the Science and Engineering of Materials, and DARPAs Structural Amorphous Metals program through Caltech’s Center for Structural Amorphous Metals. We also gratefully acknowledge the support of the Department of Energy through Caltech’s ASCI/ASAP Center for Simulating the Dynamic Response of Materials. We would like also to thank Prof. W.L. Johnson, Dr. R.D. Conner and Prof. G. Ravichandran of Caltech for providing valuable experimental data and helpful discussions.
Funding AgencyGrant Number
Defense Advanced Research Projects Agency (DARPA)UNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
Subject Keywords:Bulk metallic glasses; Free volume; Finite deformation; Non-Newtonian viscosity; Shear band spacing
Issue or Number:2
Record Number:CaltechAUTHORS:20171128-103311936
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Official Citation:Yang, Q., Mota, A. & Ortiz, M. Comput Mech (2006) 37: 194.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:83504
Deposited By: Lydia Suarez
Deposited On:30 Nov 2017 00:23
Last Modified:15 Nov 2021 19:58

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