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首页> 外文期刊>Mechanics of materials >Non-proportionally multiaxial ratcheting of cyclic hardening materials at elevated temperatures: Experiments and simulations
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Non-proportionally multiaxial ratcheting of cyclic hardening materials at elevated temperatures: Experiments and simulations

机译：高温下循环硬化材料的非比例多轴棘轮：实验和模拟

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The uniaxial and non-proportionally multiaxial ratcheting behaviors of cyclic hardening materials at room and elevated temperatures were studied by experiments first. As an auxiliary experiment to reveal the cyclic hardening/softening feature of the material and determine the material parameters used in the developed model, the material was also tested under a uniaxial and a non-proportionally multiaxial strain cycling. Simultaneously, the effects of different loading conditions at certain temperature on the strain cyclic deformation and ratcheting were analyzed. It is shown by experiments that, the strain cyclic deformation and ratcheting behavior of the material have a great dependence on the ambient temperatures, especially to a specific range of 400-600 ℃, i.e., the material exhibits a markedly dynamic stain aging so that a higher cyclic hardening and lower ratcheting are resulted in, as comparing with the results at other temperatures. Then, based on the aforementioned experimental results, the temperature-dependent ratcheting of the material was simulated by constructing a new visco-plastic constitutive model. In the developed model, the Ohno-Abdel-Karim kinematic hardening model [Ohno, N., Abdel-Karim, M., 2000. Uniaxial ratcheting of 316FR steel at room temperature: II. Constitutive modeling and simulation. ASME J. Eng. Mater. Technol. 122 (1), 35-41] was extended to simulate the emperature-dependence of ratcheting behavior reasonably by introducing some temperature-dependent terms. It is shown that the simulated results agree with the corresponding experimental results well.
机译：首先通过实验研究了循环硬化材料在室温和高温下的单轴和非比例多轴棘轮行为。作为揭示材料循环硬化/软化特征并确定所开发模型中使用的材料参数的辅助实验，还对材料进行了单轴和非比例多轴应变循环测试。同时，分析了在一定温度下不同加载条件对应变循环变形和棘轮效应的影响。实验表明，材料的应变循环变形和棘轮行为对环境温度有很大的依赖性，特别是在400-600℃的特定范围内，即，材料表现出明显的动态污点老化，因此与其他温度下的结果相比，结果是更高的循环硬化和更低的棘齿作用。然后，基于上述实验结果，通过构建新的粘塑性本构模型，模拟了材料随温度变化的棘轮效应。在已开发的模型中，为Ohno-Abdel-Karim运动硬化模型[Ohno，N.，Abdel-Karim，M.，2000。316FR钢在室温下的单轴棘轮：II。本构模型与仿真。 ASME J.母校技术。 122（1），35-41]扩展为通过引入一些温度相关项来合理地模拟棘轮行为的温度相关性。结果表明，仿真结果与相应的实验结果吻合良好。

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