A STUDY ON DEVELOPING DUCTILE FRACTURE MODELFOR STRUCTURAL STEELS CONSIDERING THE INFLUENCE OF LODE ANGLE

Abstract

 Lode angle has recently been recognized as an important parameter, in addition to stress triaxiality, that influences the ductile fracture initiation, propagation and final failure of structural steels. A modified ductile fracture model is proposed in this paper in order to consider the effect of different stress states on the ductile fracture behavior of steels by introducing the deviatoric state parameter into this ductile fracture model. As a result, the ductile fracture behavior of structural steels under low stress triaxiality can be accurately predicted.