About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
General Poster Session
|
Presentation Title |
G-32: On the Computational Solution of Continuum Dislocation Dynamics: A Comparison of Two Stress Update Algorithms |
Author(s) |
Peng Lin, Ben Anglin, Clint Geller, Anter El-Azab, Vignesh Vivekanandan |
On-Site Speaker (Planned) |
Vignesh Vivekanandan |
Abstract Scope |
An important step in continuum dislocation dynamics (CDD) is to determine the internal stress field of the current dislocation structure to compute the driving force for dislocations. This can be done by solving the stress equilibrium equation with an eigenstrain computed by time integration of Orowan’s law. In a staggered scheme of solving the CDD and crystal mechanics, we find that numerical errors accumulate and that the eigenstrain isn't consistent with the current dislocation field after some time. Here, we present an alternative way to update the eigenstrain by employing field dislocation mechanics approach where the eigenstrain is calculated directly from the incompatibility of the current dislocation field. These two different schemes for eigenstrain/stress update are compared and the results show that the error can be reduced by using field dislocation mechanics. The improved scheme has been used to predict the stress-strain behavior and dislocation microstructure in Cu crystals. |
Proceedings Inclusion? |
Undecided |