Il modello di interfase applicato alla meso-modellazione di strutture eterogenee

All those structures that are constituted by heterogeneous materials exhibit a complex anisotropic behaviour strictly related to the static and kinematic phenomena occurring in each constituent and at their interfaces. The overall macroscopic approach may be not appropriate to describe the elastic and post-elastic response of the structures. A more rigorous approach is the meso-modelling approach. In literature, usually the thin joints of the structure are simulated by applying the so-called ’zero-thickness interface’, whose behaviour is expressed in terms of contact tractions and displacement discontinuities. However, because of the real thickness of the joint, the response depends also on internal stresses and strains within the bulk material. In this direction the enhancement of the zero-thickness interface is represented by the interphase model where strain and stresses are separated into internal and contact components.