SS304不锈钢室温非比例多轴时相关棘轮行为实验研究

Experimental Study on Non-proportionally Multiaxial Time-dependent Ratcheting of SS304 Stainless Steel at Room Temperature

在室温下,对SS304不锈钢非比例多轴循环加载下的时相关棘轮行为进行了实验研究。揭示了材料在不同加载速率、不同保持时间以及不同加载路径下的棘轮变形特性。结果显示:即使在室温下,棘轮变形也有明显的时相关效应,其棘轮行为不仅强烈依赖于加载速率而且还明显依赖于保持时间;此外,材料的棘轮行为还对加载路径有强烈的依赖性。

The time-dependent ratcheting behavior of SS304 stainless steel was experimental studied at room temperature under non-proportionally multiaxial cyclic loading. The effects of stressing rate, holding time and loading path on ratcheting were discussed in the paper. The results indicate that the ratcheting of the material presents remarkable time-dependence, i.e., the ratcheting depends not only greatly on loading rate, but also apparently on hold time even at room temperature. Further more the ratcheting also presents greatly dependence on loading path. Some significant conclusions are achieved to construct a time-dependent consti- tutive model of ratcheting.