Nonuniform and localized deformation in single crystals under dynamic tensile loading

摘要: Abstract Nonuniform and localized deformation in planar single crystals subjected to dynamic tensile loading is investigated using finite element method. An idealized double-slip model used represent the crystal geometry. A size-dependent higher-order gradient plasticity theory accounting for strains adopted characterize material. The problem involves two kinds of length scale effect. One naturally introduced by inertial other intrinsic material that related plastic strain gradients, which are a density geometrically necessary dislocations. For size-independent conventional plasticity, mode changes from an imperfection-induced (quasi static-like) imperfection-ignoring at some imposed velocity. When used, behavior more complex with variation velocity not necessarily monotonic due interaction between scales (an inertia scale) affecting response.