Establishing a unified viscoplastic constitutive equation for EA4T steel: Comparative analysis with Arrhenius model

IF 2.8 3区 工程技术 Q2 MECHANICS International Journal of Non-Linear Mechanics Pub Date : 2024-07-10 DOI:10.1016/j.ijnonlinmec.2024.104835
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Abstract

Quasi-static and impact compression experiments were conducted on EA4T steel using a Gleeble-3800 thermal simulation machine. The study aimed to investigate the complex microstructural evolution and thermal deformation behavior of EA4T steel under various experimental conditions, including temperatures ranging from 970 °C to 1170 °C and strain rates ranging from 0.01s−1 to 1s−1. To precisely elucidate these phenomena, we meticulously constructed a unified visco-plastic constitutive model using the internal variable methodology. The model's parameterization was achieved through the effective application of genetic algorithm optimization techniques. Rigorous validation of the model was performed by meticulously comparing its outputs with experimental data, including key metrics such as average grain size, recrystallized fraction, and effective flow stress. In addition,a comparative analysis with the improved Arrhenius model highlights the superior performance of the unified visco-plastic constitutive equation in capturing the intricate microstructural evolution and thermal deformation behavior exhibited by EA4T steel.

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为 EA4T 钢建立统一的粘塑性结构方程:与阿伦尼乌斯模型的对比分析
使用 Gleeble-3800 热模拟机对 EA4T 钢进行了准静态和冲击压缩实验。研究旨在探讨 EA4T 钢在各种实验条件下复杂的微观结构演变和热变形行为,包括温度范围从 970 °C 到 1170 °C,应变率范围从 0.01s-1 到 1s-1。为了精确地阐明这些现象,我们采用内变量方法精心构建了一个统一的粘弹性组成模型。该模型的参数化是通过有效应用遗传算法优化技术实现的。通过将模型输出结果与实验数据(包括平均晶粒尺寸、再结晶部分和有效流动应力等关键指标)进行细致比较,对模型进行了严格验证。此外,通过与改进的 Arrhenius 模型进行比较分析,突出显示了统一粘弹性结构方程在捕捉 EA4T 钢复杂的微观结构演变和热变形行为方面的卓越性能。
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来源期刊
CiteScore
5.50
自引率
9.40%
发文量
192
审稿时长
67 days
期刊介绍: The International Journal of Non-Linear Mechanics provides a specific medium for dissemination of high-quality research results in the various areas of theoretical, applied, and experimental mechanics of solids, fluids, structures, and systems where the phenomena are inherently non-linear. The journal brings together original results in non-linear problems in elasticity, plasticity, dynamics, vibrations, wave-propagation, rheology, fluid-structure interaction systems, stability, biomechanics, micro- and nano-structures, materials, metamaterials, and in other diverse areas. Papers may be analytical, computational or experimental in nature. Treatments of non-linear differential equations wherein solutions and properties of solutions are emphasized but physical aspects are not adequately relevant, will not be considered for possible publication. Both deterministic and stochastic approaches are fostered. Contributions pertaining to both established and emerging fields are encouraged.
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