Deformation behaviour of small scale cp‐titanium specimen with large grains

Abstract

To describe the material behaviour of the microstructure of commercially pure (cp-) titanium with the Finite Element (FE) Method, a crystal plastic material model is used. The anisotropic plastic deformation is considered by specifying the slip systems of the hexagonal-closed-packed (hcp) crystal structure. To circumvent the difficulties associated with possible nonuniqueness of the set of active slip systems, a rate-dependent formulation is used. Because of the volume preserving plastic deformation, locking effects can arise, which are dealt with by a modified F-bar deformation gradient. To investigate the material behaviour of cp-titanium small scale tensile test simulations are performed. Electronic backscatter diffraction (EBSD) investigations of the sample provides the specific grain orientations of the microstructure to perform realistic simulations.