Three-dimensional shear transformation zone dynamics model for amorphous metals

Eric R. Homer, Christopher A. Schuh

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

A fully three-dimensional (3D) mesoscale modeling framework for the mechanical behaviorofamorphous metalsisproposed. The model considers the coarse-grained action of shear transformation zones (STZs) as the fundamental deformation event. The simulations are controlled through the kinetic Monte Carlo algorithm and the mechanical response of the system is captured through finite-element analysis, where STZs are mapped onto a 3D finite-element mesh and are allowed to shear in any direction in three dimensions. Implementation of the technique in uniaxial creep tests over a wide range of conditions validates the model's ability to capture the expected behaviors of an amorphous metal, includinghigh temperatureflow conformingtothe expected constitutive law and low temperature localization inthe formofa nascent shear band. The simulation results are combined to construct a deformation map that is comparable to experimental deformation maps. The flexibility of the modeling framework is illustrated by performing a contact test (simulated nanoindentation) in which the model deforms through STZ activity in the region experiencing the highest shear stress. (Some figures in this article are in colour only in the electronic version)

Original languageEnglish (US)
Article number065009
JournalModelling and Simulation in Materials Science and Engineering
Volume18
Issue number6
DOIs
StatePublished - 2010

ASJC Scopus subject areas

  • Modeling and Simulation
  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Computer Science Applications

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