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A finite element approach for the analysis of variable core dislocations

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conference contribution
posted on 10.07.2018, 13:25 authored by Konstantinos BaxevanakisKonstantinos Baxevanakis, A.E. Giannakopoulos
A finite element description of variable core edge dislocations in the context of linear elasticity is presented in this work. The approach followed is based on a thermal analogue and the integral representation of dislocations through stresses. The objective of a variable core defect concept is to eliminate the stress singularity experienced at the dislocation core. This is accomplished assuming that the displacement discontinuity is achieved gradually over some distance. To implement this concept in a finite element scheme, we first model purely rotational crystal defects considering an appropriate pseudo-temperature distribution, which produces a dislocation array of increasing width. Accordingly, we simulate a discrete edge dislocation of linearly increasing width. This description of dislocation core is closer to experimental observations and has a physically anticipated behaviour reproducing the Volterra dislocation away from the core. Further, interactions of variable core dislocations with free boundaries and coupled dislocation partials are investigated. In all cases, we recover the analytical solutions for the stress distributions and the total strain energy

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

6th European Conference on Computational Mechanics (ECCM 6)

Citation

BAXEVANAKIS, K.P. and GIANNAKOPOULOS, A.E., 2018. A finite element approach for the analysis of variable core dislocations. Presented at the 6th European Conference on Computational Mechanics (ECCM 6), Glasgow, 11-15th June.

Publisher

European Community on Computational Methods in Applied Sciences (ECCOMAS)

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2018

Notes

This is a conference paper.

Language

en

Location

Glasgow