Static and cyclic strength of structural carbon and modified steels

Abstract

In the article there are presented the results of ex-perimental analytical study of the similar chemical compo-sition but differently heat-treated structural steel: mechani-cal properties and resistance to cyclic loading. The indica-tors of strength, plasticity and cyclic failure process were determined. Fracture analysis of compact specimens (CT) was performed with SEM. It was attempted to validate the relation of mechanical properties (Rm = 500 MPa for CS500 steel and Rm = 700 MPa for CS700 steel) with stress intensity factor (ΔKth = 18 MPa∙√m for CS500 steel and ΔKth = 10 MPa∙√m for CS700 steel