Small calibre armour piercing projectiles have a core made of hardened steel or tungsten carbide (WC). The WC core results in very high penetration and a study of protection against this threat is of high priority. When continuum mechanical calculations are made there is a need for material models to describe the behaviour of this kind of materials and material data describing WC. WC is a very hard material and shows no plastic strain in tension or bending. At the high pressures signifying penetration of armour materials, the projectile will deform plastically. In this initial report, methods for testing and simulating of hard and brittle materials like WC, other hard metal composites and ceramic materials are discussed. In the report, there is a brief description of methods of compressive, shear and hardness testing of hard and brittle materials. A more thorough description is made of the chosen testing method dynamic indentation - and how data from indentation testing can be used to develop constitutive relationships. A brief compilation of some relevant material models is done. Future work will consist of verifying the testing method with metallic materials for example steel and aluminium. Thereafter testing of hard and brittle materials like WC will be done. Material relationships are implemented in a suitable material model and the calculations are verified