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首页> 外文期刊>日本機械学会論文集. A編 >Inelastic Constitutive Equations for Modified 9Cr-1Mo Steel under Nonisothermal Cyclic Deformation Conditions (1st Report, Cyclic Deformation Behavior and Internal State Variable under Isothermal and Nonisothermal Conditions)
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Inelastic Constitutive Equations for Modified 9Cr-1Mo Steel under Nonisothermal Cyclic Deformation Conditions (1st Report, Cyclic Deformation Behavior and Internal State Variable under Isothermal and Nonisothermal Conditions)

机译：非等温循环变形条件下改性9Cr-1Mo钢的非弹性本构方程（第一份报告，等温和非等温条件下的循环变形行为和内部状态变量）

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摘要

A series of cyclic deformation tests was conducted on modified 9 Cr-1 Mo steel at various temperatures, including nonisothermal conditions to investigate inlastic behavior of the material. The material showed cyclic softening behavior under temperatures between 200℃ and 600℃, and its degree got larger as the temperature was increased. Temperature history effect was scarcely found except the case where the test temperature was changed from high to low after large cyclic softening at the high temperature. Peak stress under thermomechanical conditions showed approximately the same value as those observed under corresponding isothermal condition. Furthermore, internal state variables used in the authors' unified constitutive model were experimentally measured. An aging stress, which corresponds to resistance by dynamic strain aging effect, and an effective stress were almost constant under cyclic deformation conditions, while a back stress showed eminent cyclic softening behavior.
机译：在包括非等温条件在内的各种温度下，对改性的9 Cr-1 Mo钢进行了一系列循环变形测试，以研究材料的非弹性行为。该材料在200℃至600℃的温度下表现出周期性的软化行为，并且随着温度的升高其程度变大。除了在高温下进行大的循环软化之后将测试温度从高温改变为低温的情况之外，几乎没有发现温度历史效应。在热机械条件下的峰值应力显示出与在相应的等温条件下观察到的值大致相同的值。此外，对作者统一本构模型中使用的内部状态变量进行了实验测量。在循环变形条件下，相当于动态应变时效的电阻的时效应力和有效应力几乎恒定，而后应力则表现出明显的循环软化行为。

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