Evaluation of notch effect on the dynamic strain aging behavior of carbon steel piping material

In this study, tensile tests were performed using standard and notched bar specimens under two different displacement rates and various temperatures, in order to investigate the effects of the stress and strain concentration at the notched section on the dynamic strain aging (DSA) behavior of carbon steel piping material. In addition, finite element simulations were conducted to evaluate quantitatively the stress and strain states for both types of specimen under uniaxial tensile loading. The results showed that serration and an increase in tensile strength, which are considered to be evidence of DSA in carbon steels, can be observed from tensile tests for notched bar specimens. It was also found that the temperature region of DSA observed in the notched bar specimens was higher than the DSA region observed in the standard tensile specimens tested under the same displacement rate. The results of finite element analysis showed that his behavior is associated with the high strain rate at the notched section, which is caused by the stress and strain concentration