CALIBRATION OF CYCLIC CONSTITUTIVE MODEL OF STAINLESS-CLAD BIMETALLIC STEEL

Under the action of earthquake, structures are subjected to severe reciprocating forces. At the material level, large strain low-cycle fatigue may occur for the structural steel. At present, the Chaboche model is commonly applied to develop cyclic constitutive model of the steel, of which parameters are calibrated by using test results. This model may describe both the isotropic hardening and kinematic hardening properties, and it has been demonstrated to be capable of well simulating the cyclic behaviour of conventional mild steel; however, there may be some differences for the calibration theory and the actual practice compared with other high-performance steel, and no evidence is reported in the literature for modelling the advanced bimetal, for instance. By employing cyclic loading test data of stainless-clad (SC) bimetallic steel, specific calibration method is given herein on the basis of the Chaboche model, and is verified by finite element analyses through ABAQUS against the test data. The comparison results show that the finite element analysis curves are basically coincided with the test curves, indicating that the Chaboche constitutive model implemented by the method introduced herein is adequate for simulating the cyclic behaviour of the advanced SC bimetallic steel well, which may be applied in further seismic analyses on such steel structures.