|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XIX
||Using Delaunay triangularization to characterize non-affine displacement fields during athermal, quasistatic deformation of amorphous solids
||Weiwei Jin, Amit Datye, Udo D. Schwarz, Mark D. Shattuck, Corey S. O'Hern
|On-Site Speaker (Planned)
We investigate the non-affine displacement fields in two-dimensional Lennard-Jones models of metallic glasses subjected to athermal, quasistatic simple shear (AQS). During AQS, the shear stress versus strain displays continuous quasi-elastic segments punctuated by rapid stress drops. We capture all information concerning the atomic motion by performing Delaunay triangularizations and calculating the deformation associated with each triangle. To understand the spatio-temporal evolution of the displacement fields during shear stress drops, we track local deformation along minimal energy paths during the drops. We find that quadrupolar displacement fields form and dissipate both during the quasi-elastic segments and shear stress drops. We then perform local perturbations to single triangles. We find that local pure shear deformations give rise to mostly quadrupolar displacement fields, while other local perturbations, e.g. rotations, dilations, and simple shear of single triangles, give rise to vortex-like and dipolar displacement fields that are not frequently activated by bulk AQS.
||Modeling and Simulation, Mechanical Properties, Characterization