Finite element analysis of discrete edge dislocations: configurational forces and conserved integrals
journal contributionposted on 2017-08-03, 08:47 authored by Konstantinos BaxevanakisKonstantinos Baxevanakis, A.E. Giannakopoulos
We present a finite element description of Volterra dislocations using a thermal analogue and the integral representation of dislocations through stresses in the context of linear elasticity. Several analytical results are fully recovered for two dimensional edge dislocations. The full fields are reproduced for edge dislocations in isotropic and anisotropic bodies and for different configurations. Problems with dislocations in infinite medium, near free surfaces or bimaterial interfaces are studied. The efficiency of the proposed method is examined in more complex problems such as interactions of dislocations with inclusions, cracks, and multiple dislocation problems. The configurational (Peach-Koehler) force of the dislocations is calculated numerically based on energy considerations (Parks method). Some important integral conservation laws of elastostatics are considered and the connection between the material forces and the conserved integrals (J and M) is presented. The variable core model of Lubarda and Markenscoff is introduced to model the dislocation core area that is indeterminate by the classical theory.
- Mechanical, Electrical and Manufacturing Engineering
Published inInternational Journal of Solids and Structures
Pages52 - 65
CitationBAXEVANAKIS, K.P. and GIANNAKOPOULOS, A.E., 2015. Finite element analysis of discrete edge dislocations: configurational forces and conserved integrals. International Journal of Solids and Structures, 62 pp. 52 - 65.
Publisher© Elsevier Ltd.
- AM (Accepted Manuscript)
Publisher statementThis 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/
NotesThis article was published in the International Journal of Solids and Structures [© Elsevier Ltd.] and the definitive version is available at: https://doi.org/10.1016/j.ijsolstr.2015.01.025