Crystal Plasticity Analysis of Constitutive Behavior of 5754 Aluminum Sheet

Published: June 30, 2016

Author(s)

Minh-Son Pham, Anthony D. Rollett, Adam A. Creuziger, Mark A. Iadicola, Timothy J. Foecke

Abstract

Crystal plasticity constitutive equations for the multi-axial stress-strain behavior of aluminum alloy 5754 sheets have been developed. A Taylor model, a self-consistent visco-plastic model and an N-site model based on the Fast Fourier Transform were used to fit a single slip system hardening law to the available data for tension, plane strain and biaxial stretching. The fitting procedure yields good agreement with the monotonic stress-strain data, with similar parameter values for each model. Stress-strain behavior was also measured for sheet specimens of aluminum alloy 5754, deformed along a series of bi-linear, equal-biaxial and uniaxial strain paths, with strain path changes. Using the measured crystallographic texture before and after deformation, the previously developed crystal plasticity model that incorporates texture evolution was adapted to model the strain path changes. The analysis revealed that room temperature recovery occurs between the two stages of testing. More recently, a new approach to latent hardening has been implemented in the crystal plasticity model that incorporates the effect of higher order interactions between dislocations. Instead of accounting for binary interactions only, e.g., Lomer-Cottrell locks, ternary interactions are also included. The impact of this approach on texture development and anisotropy is discussed.
Proceedings Title: ESAFORM 2016
Conference Dates: June 15-19, 2016
Conference Location: Nantes, -1
Pub Type: Conferences

Keywords

Crystal plasticity, Constitutive law, Dislocation interactions, Latent hardening, Aluminum
Created June 30, 2016, Updated December 06, 2017