Publications
Scale bridging modeling of plastic deformation and damage initiation in polycrystals
A. Ma, A. Hartmaier.
Zachary Todorov Zachariev,Polycrystalline materials - theoretical and practical aspects, InTech, Rijeka, Croatia, 3-26, (2012)
Abstract
Plastic deformation of polycrystalline materials includes dislocation slip, twinning, grain
boundary sliding and eigenstrain produced by phase transformations and diffusion. These
mechanisms are often alternative and competing in different loading conditions described by
stress level, strain rate and temperature. Modelling of plasticity in polycrystalline materials
has a clear multiscale character, such that plastic deformation has been widely studied on
the macro-scale by the finite element methods, on the meso-scale by representative volume
element approaches, on the micro-scale by dislocation dynamics methods and on the atomic
scale by molecular dynamics simulations. Advancement and further improvement of the
reliability of macro-scale constitutive models is expected to originate from developments at
microstructural or even smaller length scales by transfering the observed mechanisms to the
macro-scale in a suited manner. Currently efficient modelling tools have been developed
for different length scales and there still exists a challenge in passing relevant information
between models on different scales. This chapter aims at overviewing the current stage
of modelling tools at different length scales, discussing the possible approaches to bridge
different length scales, and reporting successful multiscale modelling applications.
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