A COMPARATIVE ANALYSIS OF FATIGUE BEHAVIOR BETWEEN S355J2+N AND STRENX 700 STEEL GRADE

Abstract

Many engineering components in various branches of industry are subjected to fatigue loading. Steels still represent the most used group of mechanical materials for constructing bridges, buildings, ships, cars, rail vehicles, railways and etc. The most commonly used steel for producing carrying parts of structures, exposed to fatigue loads is mild-strength S355J2+N steel grade. The use of high-strength steels allows to design lighter and simpler structures. Nevertheless, using high-strength steels for increase yield strength of the steels does not correspond to a proportional increase of fatigue resistance. Therefore, application of high-strength steels for structures exposed to fatigue loading sometimes represents a major concern of the design and raises question of whether high-strength steels should be used or not. The purpose of this paper is to present a comparative analysis of the fatigue behavior between the mild-strength S355J2+N steel grade and high-strength STRENX 700 steel grade, investigated by an experimental program of uniaxial tension–compression stress-controlled fatigue test of smooth specimens.