Orientation Effects in Single Crystal Plasticity Modeling
John Shimanek, Pennsylvania State University
While single crystal deformation behavior is foundational to predicting the strength of ductile engineering materials, plasticity model parameterization often leaves much of the physics inconclusively resolved. For example, the determination of material parameters is hindered by the application of unrealistically precise loading orientations in crystal plasticity finite element modeling, which, for a standard phenomenological hardening model, can manifest significant strength differences at even 0.1˚ away from high symmetry tensile loading orientations. For pure Cu, the strength varies by 15 percent at an engineering strain of 0.25 for misorientations of 0.3˚, which is well within experimental alignment tolerances. Additionally, the global parameter space estimation afforded by a Bayesian optimization framework shows promise in more conclusive determinations of material-specific parameters, which will allow for valid comparisons across lower length scale simulations and larger length scale experimental results.
Authors: John D. Shimanek1, Zi-Kui Liu1, Allison M. Beese1,2
1Department of Materials Science and Engineering, The Pennsylvania State University, USA
2Department of Mechanical Engineering, The Pennsylvania State University, USA
Abstract Author(s): (see above entries)