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Analysis of damage in 5083 aluminum alloy deformed at different strain rates

机译：不同应变速率下5083铝合金变形的损伤分析

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摘要

This paper presents a study on damage evolution in 5083 marine-grade Aluminum alloy while deformed under different strain rates. The concept of continuum damage mechanics (CDM) was utilized to evaluate the evolution of damage throughout the deformation process of 5083 Aluminum alloy. Tensile tests with several unloading and reloading stages were conducted at room temperature to generate true stress-true strain curves at three different strain rates of 0.001 s~(-1) 0.01 s~(-1) and 0.1 s~(-1). A scanning electron microscope (SEM) was utilized to characterize the damage at several strain levels for each strain rate. SEM results showed that void area fraction increases with strain rate and with accumulation of plastic strain. Reduction in stiffness with accumulation of plastic strain was also evaluated. Isotropic damage values were predicted using the hypotheses of strain equivalence and strain energy equivalence, as well as a recently developed energy-based model. The predicted damage values were verified via comparisons with the present SEM results. The energy-based model showed good comparisons, while the other two hypotheses overestimated the damage, especially at higher strain rates.
机译：本文提出了5083船用铝合金在不同应变速率下变形时的损伤演化研究。连续损伤力学（CDM）的概念用于评估5083铝合金整个变形过程中损伤的演变。在室温下进行了几个卸载和重新加载阶段的拉伸试验，以在三种不同的应变率0.001 s〜（-1），0.01 s〜（-1）和0.1 s〜（-1）下生成真实的应力-真实应变曲线。利用扫描电子显微镜（SEM）来表征每种应变速率在几个应变水平下的损伤。 SEM结果表明，空孔率随应变率和塑性应变的累积而增加。还评估了随着塑性应变的积累而降低的刚度。各向同性损伤值是使用应变当量和应变能当量的假设以及最近开发的基于能量的模型来预测的。通过与目前的SEM结果进行比较来验证预测的损伤值。基于能量的模型显示出良好的比较，而其他两个假设则高估了损伤，尤其是在较高应变率下。

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