Deformation criterion of failure at plastic flow
The way of dependence of accumulated deformation limit value on separate forming factors (at constant values of the other parameters) is determined and a level of this influence is calculated. The influence of deformation temperature, strain rate, stressed state, deformation accumulation non-linearity, and deformation non-monotony is considered. It is de­termined that influences of the four out of the five considered factors are significant at forecasting failure in plastic deformation processes. Deformation speed is ascertained to be an insignificant factor. The proposed deformation criterion is a unique reliable criterion for forecasting failure in such processes that are complex in their stress-strained state as cross-wedge rolling.