FATIGUE BEHAVIOUR OF TITANIUM-CLAD BIMETALLIC STEEL PLATE WITH DIFFERENT INTERFACIAL CONDITIONS

Titanium-clad (TC) bimetallic steel is a type of high-performance steel, with high corrosion resistance attributed to the titanium alloy and economy as well as excellent mechanical properties resulted from structural steel. Such advanced bimetallic steel is suitable for marine structures, bridges, and buildings exposed to the highly corrosive environment. This paper aims to clarify the high cycle fatigue properties of the hot-rolled TC bimetallic steel with two interface shear strengths of 40MPa and 140MPa. Their stress-strain curves were obtained by the tensile coupon tests. The fatigue S-N curves of TC bimetallic steel at a stress ratio of 0.1 are introduced, which show excellent fatigue performance compared with structural steel. In addition, the hot-rolled TC bimetallic steel with 140 MPa interface shear strength has 21% improvement in fatigue performance than the other one. Despite this, the influence of the interfacial conditions on the high cycle fatigue performance is generally limited. Finally, the S-N curves suitable for these two kinds of TC bimetallic steel are suggested. The research outcomes can provide a reference for understanding the fatigue behaviour of the TC bimetallic steel and the selection of different interfacial conditions in structural engineering