Damage accumulation at static deformation of a solid with a regular structure: microcracks and nonrelaxed stress

It is shown using the methods of acoustic emission in the version of linear location and internal friction that, upon extension of an initially equilibrium composition (carbon-fiber-reinforced plastic), nonrelaxed stress is accumulated at sites of explosive creation of microcracks. This process is caused by incomplete relaxation redistribution of the stored energy/elastic strain according to the nonlinear mechanism. The increasing level of nonrelaxed stress inevitably transforms a heterogeneous body into the metastable state. Due to this, the dissipative ability of the system as a whole decreases and the probability of occurrence of a nonequilibrium crack increases.