Validation of Stress Concentration Factor and Estimation of Local Stresses Beyond Yield Point of the Material for Notched Specimens

Abstract

In this paper, estimation of stresses at the notch root is reported for the three notched specimens using finite element analysis (FEA). Linear FEA is performed on the notches to evaluate stress concentration factor (Kt) and validated using Roark’s formulae. For the three specimens, nonlinear finite element analysis (NLFEA) is performed to evaluate local plastic stresses at the notch root and compared using notch stress strain conversion (NSSC) rules viz., Neuber’s rule and Equivalent strain energy density (ESED) approach. It is found that Neuber’s rule predicts better results of plastic stresses for flat specimens, whereas ESED predicts better results for cylindrical specimen.