About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Algorithm Development in Materials Science and Engineering
|
Presentation Title |
Line Free 3D Dislocation Dynamics in Finite Domains |
Author(s) |
Aitor Cruzado, Pilar Ariza, Alan Needleman, Michael Ortiz, Amine Benzerga |
On-Site Speaker (Planned) |
Aitor Cruzado |
Abstract Scope |
We develop a method for three-dimensional discrete dislocation plasticity in finite domains. The method is based on the line-free framework of monopoles, in which dislocation events are considered as a transportation map problem. Long-range interactions are accounted for through linear elasticity and a core regularization procedure. Monopole motion is governed by an appropriate expression of the Peach-Koehler force and a drag-type relation. General boundary-value problem solutions are obtained by superposition of the infinite medium solution for the dislocations and a complementary finite-element solution that enforces boundary conditions. A computationally efficient approach, based on the principle of virtual work, is used to formulate and solve the image problem. Special attention is given to the interaction of curved dislocations with arbitrary domain boundaries and free surfaces. For illustration, calculations are carried out to investigate size effects that may arise in the compression of pillars and torsion of wires. |
Proceedings Inclusion? |
Planned: |
Keywords |
Computational Materials Science & Engineering, Modeling and Simulation, Mechanical Properties |