对SS304不锈钢在室温单轴循环加载下的时相关棘轮行为和时 相关应变循环特性进行了实验研究. 讨论了材料在不同加载速率、不同保持 时间和不同加载波形下的循环软/硬化行为和棘轮行为特征. 结果表明: 即使在室温下, SS304不锈钢也表现出明显的时相关效应； 材料的循环变形行 为, 特别是棘轮行为明显地依赖于加载速率和保持时间以及加载波形的形状. 研究得到了一些有助于时相关循环变形行为本构描述的结论.
The uniaxial time-dependent strain cyclic characteristics and ratcheting behavior of SS304 stainless steel were studied by cyclic loading experiments at room temperature. The effects of straining and stress rates, hold time and loading chart on cyclic softening/hardening feature and ratcheting were discussed. It is shown that the SS304 stainless steel presents remarkable time-dependent characteristics even at room temperature, the cyclic deformation behaviors, especially for ratcheting, depend significantly on strain and stress rates, holding time and loading charts. Some significant conclusions are obtained, which is useful to establish a constitutive model describing the time-dependent cyclic deformation of the material.
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