Prediction of texture-induced plastic anisotropy in AA6014-T4 aluminium sheets utilising two different crystal plasticity-based constitutive models

Two crystal plasticity-based constitutive models that differ with respect to the flow rule (rate-dependent/rate-independent) and hardening law (phenomenological/physical-based), among other aspects, are compared with each other. To this end, both crystal plasticity-based constitutive models were deployed within a finite element framework to predict the texture-induced plastic anisotropy of an AA6014-T4 aluminium alloy considering uniaxial loading at 0°, 15°, 30°, 45°, 60°, 75° and 90° with respect to the rolling direction. The results of the stress-strain curves, the normalised yield stresses and the r-values demonstrate that both crystal plasticity-based constitutive models provide comparable results. Also, the experimental r-values were predicted with reasonable accuracy. Differences with respect to the experimental normalised yield stresses are discussed and were most likely caused by an additional direction-dependent mechanism.