Abstract It has been proposed that a plastic strain surface is reset to a point and re-evolves every cycle to correctly evaluate the plastic strain range under cyclic loading (Ohno et al., 2018b). This resetting scheme has the advantage of providing a definite value for the evolution parameter irrespective of the amounts of cyclic hardening, pre-straining, and ratcheting. In the present study, the resetting scheme was experimentally verified by performing the following three types of uniaxial cyclic tests of 316 stainless steel at 600 °C: constant strain range, gradual decrease, and step decrease tests. The gradual decrease tests, a new type of cyclic tests, had gradual strain range reduction with increasing number of cycles in the absence and presence of ratcheting such as found at notch roots. Thus, the effect of the strain range history on cyclic hardening was observed to be weaker than that due to stepwise decreasing the strain range. Using a constitutive model with the resetting scheme enabled good simulation of the cyclic hardening behavior in the gradual decrease tests. Cyclic softening after stepwise decreasing the strain range was also simulated well by extending the evolution equation of cyclic hardening.

中文翻译：

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循环塑性中塑性应变范围评估的重置方案：实验验证

摘要 已经提出将塑性应变表面重置为一个点并在每个循环重新演化以正确评估循环载荷下的塑性应变范围（Ohno 等人，2018b）。这种重置方案的优点是可以为演化参数提供一个确定的值，而与循环硬化、预应变和棘轮的数量无关。在本研究中，通过在 600 °C 下对 316 不锈钢进行以下三种类型的单轴循环试验，对复位方案进行了实验验证：恒定应变范围试验、逐渐下降试验和阶梯下降试验。渐减试验是一种新型的循环试验，在不存在和存在棘轮（例如在凹槽根部发现）的情况下，随着循环次数的增加，应变范围逐渐减小。因此，观察到应变范围历史对循环硬化的影响比逐步减小应变范围所产生的影响要弱。使用带有重置方案的本构模型可以很好地模拟逐渐减少测试中的循环硬化行为。通过扩展循环硬化的演化方程，也很好地模拟了逐步减小应变范围后的循环软化。