Prediction of failure strain according to stress triaxiality of a high strength marine structural steel

For the accurate prediction of failure behaviors in case of ship collisions and strandings, it is urgent to establish failure criteria of marine steels. The stress triaxiailty is considered as an important factor for prediction of failure strain of a metallic material. This study deals with effect of stress triaxiality on failure strain of a typical high strength marine structural steel EH36. Tensile tests were carried out for flat specimens with different notches from relatively smooth to sharp notched specimens. Numerical simulations of each specimen are performed by using ABAQUS. From comparison of the engineering stress-strain curves from experiments and numerical simulations, failure strains are identified. It is concluded that the failure strains are well expressed as a function of the average stress triaxiality.