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In assessing marginal change in the process of metal forming, plasticity is significantly affected by the rate of damage accumulation and their healing as derivatives of the stress state indicators. It is shown that under complex loading conditions, when the damage accumulation rate (the first derivative of the stress state indicators) is more than 5 and the curvature of the material deformation trajectories (the second derivative of the stress state indicators) is greater than 1, the scalar integral criteria give the most reliable results destruction, taking into account the influence of the history of deformation on plasticity.

THE INFLUENCE OF RATE OF DAMAGE ACCUMULATION IS USED IN THE CALCULATION OF DUCTILITY RESOURCE