EXPERIMENTAL STUDY ON DUCTILE FRACTURE BEHAVIOR OF HIGH STRENGTH STEELS UNDER HIGH STRESS TRIAXIALITY

Abstract

 In this study, in order to simulate the occurrence and growth of ductile cracks in structural steels in the high stress triaxiality region, tensile tests were conducted on test pieces with notches, having different notch radii and notch angles. The test specimens were made of SBHS, a type of steel for high performance structures, as well as two types of conventional structural steels SM570 and SM490. By comparing the effects of different notch radii, notch angles, steel grades, and chemical compositions, mechanical properties, crack initiation, and its propagation up to fracture were clarified.