Abstract: The paper presents a principal formulation of statistical evolution of mic-rocracks, occurring in solids, subjected to external loading. In particular, the concept of ideal microcracks is elaborated, in order to describe the fundamental features of damage resulting from nucleation and extension of microcracks. Relevant average damage functions are also discussed.The paper presents a principal formulation of statistical evolution of mic-rocracks, occurring in solids, subjected to external loading. In particu...