双相型不锈钢S22053循环本构关系研究

为研究国产双相型不锈钢S22053在循环荷载下材料的力学性能和本构关系，该文采用S22053热轧钢板加工成母材试件，进行单调和循环加载试验，得到14种加载制度下的应力-应变曲线。基于单调加载试验曲线，分析了单调荷载下的材料性能；利用等应变幅加载试验曲线拟合了Chaboche混合强化参数，并用有限元软件ABAQUS对试验进行模拟计算，对比、验证了拟合效果。结果表明:双相型不锈钢S22053延性较好，没有明显的屈服平台和屈服点，比例极限较低；循环骨架曲线可以采用Ramberg-Osgood模型进行拟合；采用不同分量模型标定的3组混合强化参数均能较好的模拟材料的循环受力特征，其中三背应力分量模型(N2L1)拟合效果最好。研究结果可用于分析计算双相型不锈钢结构在地震作用下的受力性能。

CONSTITUTIVE RELATION OF DUPLEX STAINLESS STEEL S22053 UNDER CYCLIC LOADING

To study the mechanical properties and constitutive relation of DSS (duplex stainless steel) S22053 under cyclic loading, specimens machined from S22053 hot-rolled steel plate were tested under monotonic and cyclic loading patterns. Based on the monotonic curves, the material mechanical properties under monotonic load were analyzed. The material parameters of the Chaboche model were obtained using the results of the specimens with constant strain amplitude, and the test curves were simulated by the finite element software ABAQUS. The results reveal that DSS S22053 has good ductility and low proportional limit. No obvious yield platform or yield point was observed. The cyclic backbone curve can be well fitted with the Ramberg-Osgood model. The three types of combined parameters calibrated by different component models can simulate the hysteresis curve of materials well, and the three-back stress component model (N2L1) has the best fitting effect. The results can be used to analyze and calculate the mechanical performance of DSS structures under seismic load.