EXPERIMENTAL STUDY OF DEFORMATION BEHAVIOR AND FATIGUE LIFE OF S355J2+N STEEL GRADE UNDER CYCLIC LOADING

Abstract

Fatigue is a progressive, localized, permanent structural change that occurs in materials subjected to fluctuating stresses and strains that may result in cracks or fracture after a sufficient number of fluctuations. Fatigue fractures are caused by the simultaneous action of cyclic stress, tensile stress and plastic strain. If one of these three acting phenomena is not present, fatigue cracking will not initiate and propagate. In this paper, the cyclic deformation behavior and fatigue life of S355J2+N welding steel used for construction were studied experimentally. A complete cyclic characterization of the material is obtained, including new experimental ε–N fatigue curves for uniaxial tension–compression. The work has been developed using the experimental equipment and procedures available in Centre for engineering software and dynamic testing at Faculty of Engineering University of Kragujevac.