42nd International Deep Drawing Research Group Conference - IDDRG 2023

Virtual experiments based on crystal plasticity simulations are a common approach to predict the texture-induced plastic anisotropy of polycrystalline sheet metals. Such simulation approaches utilise a crystal plasticity constitutive model that describes the deformation behaviour of single crystals on the base of crystallographic slip. However, there are different mathematical formulations of crystal plasticity constitutive models available in the literature. In this conference paper, two crystal plasticity constitutive models that differs with respect to the flow rule (rate-depended/rate-independent) and hardening law (phenomenological/physical-based) are compared with each other. To this end, both crystal plasticity constitutive models are deployed in combination with the finite element method to simulate the plastic anisotropy of an AA6014-T4 aluminium alloys regarding uniaxial loading in 0°, 15°, 30°, 45°, 60°, 75° and 90° with respect to the rolling direction and biaxial loading. The results of the stress strain curves, normalised yield stresses and r-values demonstrate that both crystal plasticity constitutive models provide comparable results. Also, the experimental r-values are predicted with reasonable accuracy. Differences with respect to the experimental normalised yield stresses are discussed and most likely caused by precipitates.