Effects of stress concentration and occurrence of limit states under high speed loading in low temperature operating conditions

Abstract

Due to the fact that the processes of fracture of machine parts and structural components usually initiate in the zones of stress and strain concentrations, the problems of assessment of stress-stain response and limit states of the material in these zones become the most critical. The capacity of the structural components to sustain load and resist fracture depends on the strain rate and temperatures. One should also take into consideration the increase of stress triaxiality in the notch zones that cause local plasticity reduction and the increase of the yield stress value. The approximate analytical approach was developed to address the problem. The effect of stress and strain concentration in a wide range of applied strains is described using a modified Neuber equation. The influences of strain hardening and strain rate are described by power law equations. Temperature is accounted for using exponential relationships