Fracture stress in compression of TiB2 : Strain rate sensibility and modeling

The aim of this study consists in developing a simple model which could evaluate the fracture stress, in uniaxial compressive loadings, of brittle materials, like ceramics. We first prove that fracture stress of a polycrystalline TiB2 is independent of strain rate. Then, we present a modeling of this stress based on fracture mechanics principles and which parameters are the toughness, the porosity rate, the pores size and their shape, i.e. material intrinsic values.