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| ZL205A铝合金动态力学性能及其本构模型 |
| Dynamic Mechanical Properties and Constitutive Model of ZL205A Aluminum Alloy |
| Received:July 12, 2023 |
| DOI：10.3969/j.issn.1674-6457.2023.10.012 |
| 中文关键词: ZL205A铝合金 霍普金森 温度敏感性 Johnson-Cook本构模型 绝热温升 |
| 英文关键词: ZL205A aluminum alloy Hopkinson temperature sensitivity Johnson-Cook constitutive model adiabatic temperature rise |
| 基金项目:国家自然科学基金(52105408，52075503);中北大学研究生科技立项(20221812) |
| Author Name | Affiliation | | SHI Yan-hao | School of Mechanical Engineering, North University of China, Taiyuan 030051, China
Shanxi Key Laboratory of Intelligent Equipment Technology in Harsh Environment, Taiyuan 030051, China | | XIN Zhi-jie | School of Mechanical Engineering, North University of China, Taiyuan 030051, China
Shanxi Key Laboratory of Intelligent Equipment Technology in Harsh Environment, Taiyuan 030051, China | | LU Hui-hu | School of Mechanical Engineering, North University of China, Taiyuan 030051, China
Shanxi Key Laboratory of Intelligent Equipment Technology in Harsh Environment, Taiyuan 030051, China | | CUI Jing | School of Mechanical Engineering, North University of China, Taiyuan 030051, China
Shanxi Key Laboratory of Intelligent Equipment Technology in Harsh Environment, Taiyuan 030051, China | | HUANG Xiao-bin | School of Mechanical Engineering, North University of China, Taiyuan 030051, China
Shanxi Key Laboratory of Intelligent Equipment Technology in Harsh Environment, Taiyuan 030051, China |
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| 中文摘要: |
| 目的 研究ZL205A铝合金在不同温度和不同应变速率下的流动应力行为，为材料数值模拟提供参数依据。方法 利用高低温电子万能材料实验机和霍普金森压杆设备，在不同变形温度(20~400 ℃)和应变速率(10−4~2 200 s−1)下进行准静态拉伸实验、高温拉伸实验以及高应变率动态压缩实验。对实验所得真应力-应变曲线进行力学性能分析，考虑到霍普金森实验下的材料绝热温升，构建了ZL205A铝合金的Johnson-Cook本构模型，并将该模型与实验数据进行比对验证。结果 在室温低应变率(20 ℃、10−4~10−1 s−1)条件下，随应变率的增大，材料的流动应力变化不明显;当材料屈服后，随着应变的增大，材料流动应力增大的趋势变大，应变硬化作用占主导。在室温高应变率(20 ℃、500~2 200 s−1)条件下，材料的屈服强度和流动应力与室温低应变率时的数据变化不大，考虑到高应变率下的实验时间短、变形大，材料变形产生的热量来不及散出，受温度升高的影响，材料在高应变率范围内的应变率强化效应不明显。在高温低应变率(100~400 ℃/0.001 s−1)条件下，材料的屈服强度和流动应力随温度的升高而迅速降低，表现出较高的温度敏感性，当温度高于200 ℃时，材料产生拉应力回调现象。结论 根据材料真应力-应变曲线，获得了材料的Johnson-Cook本构参数，该模型能较准确地预测材料在不同状态下的流动应力行为。 |
| 英文摘要: |
| The work aims to study the flow stress behavior of ZL205A aluminum alloy at different temperatures and strain rates, and provide parameter basis for material finite element simulation. The quasi-static tensile test, high temperature tensile test and high strain rate dynamic compression test were carried out at different deformation temperatures (20-400 ℃) and strain rates (10−4-2 200 s−1) respectively with the high and low temperature electronic universal material testing machine and Hopkinson pressure bar equipment. The mechanical properties of the true stress-strain curve obtained from the test were analyzed. Considering the adiabatic temperature rise of the material under the Hopkinson test, the Johnson-Cook constitutive model of ZL205A aluminum alloy was constructed and compared with the test data. At low strain rates at room temperature (20 ℃, 10−4-10−1 s−1), the flow stress of the material did not change significantly with the increase of strain rate. After the material yielding, the flow stress of the material increased with the increase of strain, and the strain hardening effect dominated. At high strain rates at room temperature (20 ℃, 500-2 200 s−1), the yield strength and flow stress of the material had little change compared with the data at low strain rates at room temperature. Considering that high strain rate testing had a short time and large deformation, the heat generated by material deformation could not be dissipated in time. Due to the influence of temperature rise, the strain rate strengthening effect of the material was not significant within the high strain rate range; At high temperatures and low strain rates (100-400 ℃/0.001 s−1), the yield strength and flow stress of the material rapidly decreased with the increase of temperature, exhibiting high temperature sensitivity. When the temperature exceeded 200 ℃, the material was accompanied by a tensile stress callback phenomenon. According to the true stress-strain curve of the material, the Johnson-Cook constitutive parameters of the material are obtained, which can accurately predict the flow stress behavior of the material in different states. |
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