304不锈钢非比例循环棘轮行为的实验研究

在室温下对３０４不锈钢在非比例循环加载下的棘轮行为进行了实验研究。在圆形、菱形和直线形状的非比例双轴循环加载路径下，研究不同轴向平均应力、等效应力幅值大小及基历史下材料的棘轮行为特征，为了比较，还进行了单轴加载下该材料的循环棘轮行为实验，实验表明，３０４不锈钢的室温非比例循环棘轮行为明显地依赖于加载路径的形状；与单轴循环棘轮行为一样，非比例循环棘轮行为也明显地依赖于轴向平均应力和等效应幅值的大小及

EXPERIMENTAL STUDY FOR NONPROPORTIONAL CYCLIC RATCHETING OF 304 STAINLESS STEEL

An experimental study was carried out on the cyclic ratcheting of 304 stainless steel subjected to nonproportional cyclic loading at room temperature. The cyclic ratcheting tests were conducted for the circular, rhombic and linear paths of nonproportional loading with different axial mean stresses, equivalent stress amplitudes and their histories. To compare, the uniaxial cyclic ratch- eting was also tested. The experimental result shows that, at room temperature, the nonproportional ratcheting of 304 stainless steel depends significantly on the shape of load path, and on the values of axial mean stress, equivalent stress amplitude and their histories as uniaxial ratcheting does.