The viscoplastic deformation of polycrystals under uniaxial loading is investigated to determine the relationship between hot spots in stress and their location in relation to the microstructure. A 3D full-field formulation based on fast Fourier transforms for the prediction of the viscoplastic deformation of poly-crystals is used with rate-sensitive crystal plasticity. Two measured polycrystalline structures are used to instantiate the simulations, as well as a fully periodic synthetic polycrystal adapted from a simulation of grain growth. Application of (Euclidean) distance maps shows that hot spots in stress tend to occur close to grain boundaries. It is also found that low stress regions lie close to boundaries. The radial distribution function of the hot spots indicates clustering. Despite the lack of texture in the polycrystals, the hot spots are strongly concentrated in ##IMG## http://ej.iop.org/icons/Entities/lang.gif lang 1 1 0 ##IMG## http://ej.iop.org/icons/Entities/rang.gif rang orientations, which can account for the observed clustering. All three microstructures yield similar results despite significant differences in topology.
Description
Stress hot spots in viscoplastic deformation of polycrystals
%0 Journal Article
%1 0965-0393-18-7-074005
%A Rollett, A D
%A Lebensohn, R A
%A Groeber, M
%A Choi, Y
%A Li, J
%A Rohrer, G S
%D 2010
%J Modelling and Simulation in Materials Science and Engineering
%K FEM simulation stress viscoplastic
%N 7
%P 074005
%T Stress hot spots in viscoplastic deformation of polycrystals
%U http://stacks.iop.org/0965-0393/18/i=7/a=074005
%V 18
%X The viscoplastic deformation of polycrystals under uniaxial loading is investigated to determine the relationship between hot spots in stress and their location in relation to the microstructure. A 3D full-field formulation based on fast Fourier transforms for the prediction of the viscoplastic deformation of poly-crystals is used with rate-sensitive crystal plasticity. Two measured polycrystalline structures are used to instantiate the simulations, as well as a fully periodic synthetic polycrystal adapted from a simulation of grain growth. Application of (Euclidean) distance maps shows that hot spots in stress tend to occur close to grain boundaries. It is also found that low stress regions lie close to boundaries. The radial distribution function of the hot spots indicates clustering. Despite the lack of texture in the polycrystals, the hot spots are strongly concentrated in ##IMG## http://ej.iop.org/icons/Entities/lang.gif lang 1 1 0 ##IMG## http://ej.iop.org/icons/Entities/rang.gif rang orientations, which can account for the observed clustering. All three microstructures yield similar results despite significant differences in topology.
@article{0965-0393-18-7-074005,
abstract = {The viscoplastic deformation of polycrystals under uniaxial loading is investigated to determine the relationship between hot spots in stress and their location in relation to the microstructure. A 3D full-field formulation based on fast Fourier transforms for the prediction of the viscoplastic deformation of poly-crystals is used with rate-sensitive crystal plasticity. Two measured polycrystalline structures are used to instantiate the simulations, as well as a fully periodic synthetic polycrystal adapted from a simulation of grain growth. Application of (Euclidean) distance maps shows that hot spots in stress tend to occur close to grain boundaries. It is also found that low stress regions lie close to boundaries. The radial distribution function of the hot spots indicates clustering. Despite the lack of texture in the polycrystals, the hot spots are strongly concentrated in ##IMG## [http://ej.iop.org/icons/Entities/lang.gif] {lang} 1 1 0 ##IMG## [http://ej.iop.org/icons/Entities/rang.gif] {rang} orientations, which can account for the observed clustering. All three microstructures yield similar results despite significant differences in topology.},
added-at = {2011-03-26T11:43:23.000+0100},
author = {Rollett, A D and Lebensohn, R A and Groeber, M and Choi, Y and Li, J and Rohrer, G S},
biburl = {https://www.bibsonomy.org/bibtex/222a122e83cda760422842513e3167ef8/heprom},
description = {Stress hot spots in viscoplastic deformation of polycrystals},
interhash = {1f336e45c8842efe766553207341ab62},
intrahash = {22a122e83cda760422842513e3167ef8},
journal = {Modelling and Simulation in Materials Science and Engineering},
keywords = {FEM simulation stress viscoplastic},
number = 7,
pages = 074005,
timestamp = {2011-03-26T11:43:23.000+0100},
title = {Stress hot spots in viscoplastic deformation of polycrystals},
url = {http://stacks.iop.org/0965-0393/18/i=7/a=074005},
volume = 18,
year = 2010
}