Criteria of damage origin in constructions made from composite materials
Meso-model of composite material represented by the two-component medium is described. The techniques of the model parameter determination and the failure criteria of composite material constituents and interface boundary of the unidirectionally reinforced materials are considered. Main resolving equations, which were derived on the base of energy balance, are given. Whole chain of events, which consists of failure initiation in one of the composite material constituents, stress redistribution in the damage vicinity, accumulation and development of damage at load increase and full damage cumulation, bringing to loss of carrying capacity, is shown by researches of strain-stress state of fan blade root model.