Texture effects on shear response in Ti-6Al-4V plates

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. (C) 2002 Published by Elsevier Science Ltd.