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Multilength-scale modeling: Crystal-plasticity models in implicit finite element codes

机译：多尺度建模：隐式有限元代码中的晶体塑性模型

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A multidisciplinary team of researchers from Chemistry & Materials Science and Mechanical Engineering have recently completed the first year of an LDRD Director's Initiative. This initiative involves the development of physics-based multilength-scale models to optimize casting and deformation processing of polycrystalline materials. The purpose of this initiative is to develop models to simulate the material's mechanical response on the meso length-scale. The meso length-scale refers to the realm where the material microstructure (e. g., grain size and shape, crystallite orientation, etc.) is resolved but dislocations are homogenized. The recent development of two experimental technologies has provided a unique capability to validate material models on the mesolength-scale. The first of these technologies is the ultrahigh-vacuum diffusion bonding machine. This machine has been demonstrated to build bicrystals with high-precision planar grain boundaries joining two precisely oriented crystallites. The second technology is Orientation Imaging Microscopy. This technology has been demonstrated to precisely determine the local lattice orientation in a microstructure. Hence, this provides a powerful tool to characterize local lattice rotations following specified levels of deformation. The coupling of these two technologies provides a tool for detailed study of a material's mechanical response due to the presence of an interface or grain boundary. 6 refs., 6 figs.

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