Fretting modelling with a crystal plasticity model of Ti6Al4V

In this paper, a polycrystal plasticity model of the cyclic behavior of the titanium alloy Ti6Al4V is presented and used in a finite element model of fretting. The polycrystal plasticity model is constructed using finite element meshes of representative elementary volumes. In these, grains are represented by Voronoi polyhedra and a grain orientation. The model identification process includes the search for the relative critical resolved shear stresses (CRSS), of the slip families of the α-titanium crystal, the total CRSS introducing crystallographic texture and the hardening laws using uniaxial fatigue tests in the Rε = 0 and Rε = −1 regimes. The material model is used in a 3D cylinder/plate fretting computation. The results are discussed showing the equivalent inelastic strain and the contact pressure evolution. The results show the anisotropic influence of the polycrystal material model on fretting fatigue. The Dang Van high cycle fatigue parameter is evaluated and an adaptation to microscale computations is proposed.