Abstract
The results of theoretical and experimental investigations provide explanation of the mechanism of stochastic branching during crack propagation in a solid, relating this phenomenon to changes in the fundamental symmetry relationships in a nonlinear system representing the solid with defects. The character of the stochastic behavior of quasibrittle materials is determined by nonlinear dynamics of the ensemble of microscopic defects under the conditions of kinetic transitions. The transition from dispersed to macroscopic fracture is accompanied by the appearance of multiple fracture zones in the regime of explosion-like instability development over a discrete spectrum of spatial scales.
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