Abstract :
Due to the asymmetric nature of crystallographic slip and twinning in hexagonal-close-packed (hcp) materials, the bulk mechanical properties are strongly affected by the orientation distribution of single crystals in the aggregate. The following work is a description of in-plane shear response in Ti–6Al–4V polycrystalline aggregates nominally textured via routine deformation and thermal processing schedules. For rolled plates, a 2D constitutive model for slip and twinning (treated here as pseudo-slip) is derived for the hcp single crystal. The polycrystal is constructed by incorporating the material theory into a finite element model that explicitly represents a spatial distribution of single crystals. The polycrystal mechanical response is examined with respect to macroscopic shear loading as may take place during dynamic punch through processes.
