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research-article

Atomistically-informed and dislocation-based viscoplasticity model for multilayer composite thin films

[+] Author and Article Information
Mohsen Damadam

School of Mechanical and Materials Engineering, Washington State University, WA, USA; Neil Armstrong Hall of Engineering, Purdue University, West Lafayette, IN, USA
mohsen.damadam@wsu.edu

Mohammed Anazi

School of Mechanical and Materials Engineering, Washington State University, WA, USA
mh.anazi@wsu.edu

Georges Ayoub

Department of Industrial and Manufacturing Systems Engineering, University of Michigan, MI, USA
gayoub@umich.edu

Hussein Zbib

School of Mechanical and Materials Engineering, Washington State University, WA, USA
Zbib@wsu.edu

1Corresponding author.

ASME doi:10.1115/1.4042034 History: Received June 12, 2018; Revised November 07, 2018

Abstract

Nano-scale multilayer composite thin films are potential candidates for coating applications at harsh environments due to their promising mechanical and thermal properties. In this study, a viscoplasticity continuum model based on the plastic flow potential of metal/ceramic nanolayer composites, obtained from molecular dynamics (MD) simulations, is developed to build up a multiscale model bridges atomistic simulation with continuum models for the thin film composites. The model adopts a power law hardening considering confined layer slip mechanism and accounts for the evolution of dislocation density based on the statistically stored dislocations and geometrically necessary dislocations. It is then implemented into a finite element code (LS-DYNA) to investigate the deformation behavior of nanolayer composites at the macroscale. The deformation behavior of a high strength steel coated with Nb/NbC multilayer is also examined.

Copyright (c) 2018 by ASME
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