Record Details

Micromechanics of emergent patterns in plastic flows

DSpace at IIT Bombay

View Archive Info
 
 
Field Value
 
Title Micromechanics of emergent patterns in plastic flows
 
Creator BISWAS, S
GRANT, M
SAMAJDAR, I
HALDAR, A
SAIN, A
 
Subject DYNAMICS
 
Description Crystalline solids undergo plastic deformation and subsequently flow when subjected to stresses beyond their elastic limit. In nature most crystalline solids exist in polycrystalline form. Simulating plastic flows in polycrystalline solids has wide ranging applications, from material processing to understanding intermittency of earthquake dynamics. Using phase field crystal (PFC) model we show that in sheared polycrystalline solids the atomic displacement field shows spatio-temporal heterogeneity spanning over several orders of length and time scales, similar to that in amorphous solids. The displacement field also exhibits localized quadrupolar patterns, characteristic of two dislocations of the opposite sign approaching each other. This is a signature of crystallinity at microscopic scale. Polycrystals being halfway between single crystals and amorphous solids, in terms of the degree of structural order, descriptions of solid mechanics at two widely different scales, namely continuum plastic flow and discrete dislocation dynamics turns out to be necessary here.
 
Publisher NATURE PUBLISHING GROUP
 
Date 2014-10-17T04:30:28Z
2014-10-17T04:30:28Z
2013
 
Type Article
 
Identifier SCIENTIFIC REPORTS, 3
http://dx.doi.org/10.1038/srep02728
http://dspace.library.iitb.ac.in/jspui/handle/100/15953
 
Language en