Development of the Concurrent Multiscale Discrete-Continuum Model and Its Application in Plasticity Size Effect

Zhenting Zhang, Zhen Tong, Jane Jiang

Research output: Contribution to journalArticlepeer-review

Abstract

A concurrent multiscale model coupling discrete dislocation dynamics to the finite element method is developed to investigate the plastic mechanism of materials at micron/submicron length scales. In this model, the plastic strain is computed in discrete dislocation dynamics (DDD) and transferred to the finite element method (FEM) to participate in the constitutive law calculation, while the FEM solves the complex boundary problem for DDD simulation. The implementation of the whole coupling scheme takes advantage of user subroutines in the software ABAQUS. The data structures used for information transferring are introduced in detail. Moreover, a FE mesh-based regularization method is proposed to localize the discrete plastic strain to continuum material points. Uniaxial compression tests of single crystal micropillars are performed to validate the developed model. The results indicate the apparent dependence of yield stress on sample size, and its underlying mechanisms are also analyzed.
Original languageEnglish
Article number329
Number of pages16
JournalCrystals
Volume12
Issue number3
Early online date26 Feb 2022
DOIs
Publication statusPublished - 1 Mar 2022

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