|About this Abstract
|MS&T23: Materials Science & Technology
|Integration between Modeling and Experiments for Crystalline Metals: From Atomistic to Macroscopic Scales V
|Misorientation Effects in Single Crystal Plasticity Finite Element Modeling
|John Shimanek, Zi-Kui Liu, Allison M. Beese
|On-Site Speaker (Planned)
Crystal plasticity finite element methods are regularly used to ground macroscale deformation behavior in a description of physical mechanisms, often dislocation glide for the case of ductile metals. Here, such models of single crystal deformation are found to be critically sensitive to the exact loading orientation. Misorientations by even 0.1˚ from a high symmetry crystallographic axis result in significant changes to the overall stress response. This behavior is explained in terms of the increased lattice rotation and decreased slip system activation, which further explains the strong influence from slip system interactions. A case study, based on experimental data in the literature for  Cu, shows that an offset of 0.3˚ decreased the calculated material strength by 15% at a strain of 0.25. Consideration of misorientations is therefore crucial to robust single crystal plasticity parameterization, which enables valid comparisons to polycrystal deformation or to lower length scale modeling results.