|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Computational Method and Experimental Approaches for Model Development and Validation, Uncertainty Quantification, and Stochastic Predictions
||Overcoming Singularities within Rate-independent Crystal Plasticity to Enable Realistic Latent Hardening
||Milovan Zecevic, Marko Knezevic
|On-Site Speaker (Planned)
Slip system hardening behavior of a given slip system is influenced more by shearing on another slip system known as the latent hardening than shearing on itself known as the self-hardening. Rate independent crystal plasticity with realistic latent hardening description results in ellipticity loss of tangent modulus meaning that the differential equation of equilibrium is not elliptic.
Two methods are explored to suppress the loss of ellipticity. In one the latent hardening description is altered based on the single crystal experimental measurements and in another the rate-dependence is introduced through regularized form of Schmid’s law. The methods and their application in predicting the mechanical response of aluminum alloy AA6022-T4 with realistic values of latent hardening are presented. It is found that latent hardening has a significant influence on the in plane anisotropy of AA6022-T4.
||Planned: Supplemental Proceedings volume