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首页> 外文期刊>Journal of engineering materials and technology >A Simplified Transient Hardening Formulation for Modeling Stress-Strain Response Under Multiaxial Nonproportional Cyclic Loading
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A Simplified Transient Hardening Formulation for Modeling Stress-Strain Response Under Multiaxial Nonproportional Cyclic Loading

机译：用于多轴非比例循环载荷下应力-应变响应建模的简化瞬态硬化公式

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Accurate estimation of material stress-strain response is essential to many fatigue life analyses. In cases where variable amplitude loading conditions exist, the ability to account for transient material deformation behavior can be particularly important due to the potential for periodic overloads and/or changes in the degree of nonproportional stressing. However, cyclic plasticity models capable of accounting for these complex effects often require the determination of a large number of material constants. Therefore, an Armstrong-Frederick-Chaboche style plasticity model, which was simplified in a previous study, was extended in the current study to account for the effects of both general cyclic and nonproportional hardening using a minimal number of material constants. The model was then evaluated for its ability to predict stress-strain response under complex multiaxial loading conditions by using experimental data generated for 2024-T3 aluminum alloy, including a number of cyclic incremental step tests. The model was found to predict transient material response within a fairly high overall level of accuracy for each loading history investigated.
机译：准确估算材料的应力-应变响应对于许多疲劳寿命分析至关重要。在存在可变振幅加载条件的情况下，考虑到周期性超载和/或非比例应力程度变化的可能性，考虑瞬态材料变形行为的能力可能尤其重要。但是，要考虑这些复杂影响的循环可塑性模型通常需要确定大量的材料常数。因此，在先前的研究中简化了的Armstrong-Frederick-Chaboche型可塑性模型在当前研究中得到了扩展，以考虑使用最少数量的材料常数进行的一般循环和非比例硬化的影响。然后，使用为2024-T3铝合金生成的实验数据（包括许多循环增量步骤测试），评估模型在复杂多轴载荷条件下预测应力-应变响应的能力。发现该模型可以在每个调查的装载历史中，在相当高的总体精度水平内预测瞬态材料响应。

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