|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Material Behavior Characterization via Multi-Directional Deformation of Sheet Metal
||Predicting Cyclic Deformation of AA6022-T4 and DP590 Using Polycrystal Plasticity
||Milovan Zecevic, Marko Knezevic
|On-Site Speaker (Planned)
We present a polycrystal plasticity constitutive law based on the elasto-plastic self-consistent theory for the prediction of cyclic tension-compression deformation of AA6022-T4 and DP590. The model features a hardening law based on dislocation density and an evolution law for backstress at the level of slip systems. Additionally, the model for DP590 includes a geometrically necessary dislocations layer around the martensitic phase to mediate the phase-to-phase interactions. From the comparison of the predictions and experimental data, we infer that the backstresses have a dominant effect in capturing non-linear unloading while both the backstresses and inter-granular stresses govern the Bauschinger effect, and finally that reversible dislocation motion is key for capturing hardening rates during reverse loading. To facilitate treatment of complex deformation processes with heterogeneous boundary conditions, the model is subsequently incorporated within implicit finite-element frameworks and applied to several case studies in sheet metal forming.
||Planned: A print-only volume