Abstract
Based on the Pisarenko–Lebedev criterion, the equations for ultimate fracture strains at a complex stress state are derived for conditions of static and low-cycle deformation, and their experimental justification is given for different modes of biaxial loading. The experimental and calculated data on the application of the generalized condition of equivalence to the solution of problems in the mechanics of cracks at a complex stress state are presented. The models and methods for determining the direction of growth of the crack, its path, the propagation rate and duration are considered for combined modes of biaxial loading.
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