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首页> 外文会议>International Conference on Mechanical Engineering and Mechanics vol.2; 20051026-28; Nanjing(CN) >Experimental Study on Uniaxial Time-dependent Ratcheting Behavior of 1Cr_(18)Ni_9 Stainless Steel at Room Temperature
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Experimental Study on Uniaxial Time-dependent Ratcheting Behavior of 1Cr_(18)Ni_9 Stainless Steel at Room Temperature

机译：1Cr_（18）Ni_9不锈钢在室温下单轴时变棘轮行为的实验研究

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摘要

Ratcheting is a cyclic accumulation of inelastic deformation that occurs when structure components are subjected to a cyclic loading with non-zero mean stress. Existing studies show that the ratcheting is greatly dependent on loading path, loading rate and temperature. In this work, a series of experiments were conducted with the emphasis on the uniaxial time-dependent strain cyclic characteristics and ratcheting behavior of 1Crl8Ni9 stainless steel at room temperature. The effects of straining or stressing rate and hold time at peak/valley of each cycle on the cyclic softening/hardening and ratcheting behavior, as well as the interaction of creep and ratcheting were discussed. The results reveal that the material presents an apparent time-dependent cyclic deformation behavior at room temperature. Its cyclic hardening behavior and ratcheting strain depend markedly on the straining/stressing rate and the hold time; and the creep strain has greater restraining effect on the ratcheting behavior. Some significant conclusions are obtained, which are useful to establish a constitutive model to describe the time-dependent cyclic deformation of the material.
机译：棘轮效应是非弹性变形的循环累积，当结构部件受到平均应力为非零的循环载荷时发生。现有研究表明，棘轮在很大程度上取决于加载路径，加载速率和温度。在这项工作中，进行了一系列实验，重点是室温下1Crl8Ni9不锈钢的单轴时变应变循环特性和棘轮行为。讨论了每个循环的峰值/谷处的应变或应力率以及保持时间对循环软化/硬化和棘轮行为以及蠕变和棘轮相互作用的影响。结果表明，该材料在室温下表现出明显的时间依赖性循环变形行为。它的循环硬化行为和棘轮应变明显取决于应变/应力率和保持时间。蠕变应变对棘轮行为的抑制作用更大。得到了一些有意义的结论，这些结论对于建立描述材料随时间变化的本构模型是有用的。

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