| Abstract: | Development of constitutive models for engineering materials is often based on a framework of elasticity and plasticity theories as developed for metals. Prsented here is a review of some of the basic differences in the experimentally observed behaviour of metals and frictional materials. Two of the distinguishing characteristics between metals and frictional materials are the absence or presence of voids and the tendency to change or maintain constant volume during compression and shear. These differences must be recognized in order to develop reasonable constitutive models for frictional materials. |
