2024-T42铝合金低中应变率力学性能及本构关系

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摘要为研究2024-T42铝合金的低中应变率力学性能和本构关系，采用电子万能实验机和高速液压伺服材料实验机，进行常温下2024-T42铝合金准静态、低中应变率拉伸实验，得到材料在不同应变率下的应力-应变曲线。考虑颈缩对真实应力-真实应变的影响，采用仿真反演方法对颈缩后的真实应力-真实应变曲线进行修正，并基于Johnson-Cook本构模型进行拟合。结果表明：2024-T42铝合金在低中应变率范围的率敏感性较弱；但具有较强的应变硬化效应；基于仿真分析的反演修正方法能较好重构材料颈缩点后的真实应力-真实应变曲线；并通过铝管压溃实验和仿真分析，验证了反演修正方法的合理性和所获本构模型参数的准确性。

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	张宇
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	白春玉

关键词 ： 2024-T42铝合金, Johnson-Cook本构, 低中应变率, 颈缩, 反演修正

Abstract：In order to study the dynamic mechanical property and constitutive relation of 2024-T42 aluminum alloy under medium-low strain rate, quasi-static and medium-low strain rates tests were carried out by using a quasi-static tensile test system and INSTRON VHS160-100/20 high velocity test system to obtain the stress-strain curves at different strain rates.Considering the effect of necking on the true stress-strain, a simulation inversion method was used to correct the true stress-strain curve after necking, which was then fitted based on the Johnson-Cook constitutive model.The results show that the rate sensitivity of 2024-T42 aluminum alloy is weak in the intermediate and low strain rate range, but it has a strong strain hardening effect; the inversion correction method based on simulation analysis can better reconstruct the true stress-strain curve after necking point; and through the aluminum tube crush test and simulation analysis, the rationality of the inversion correction method and the accuracy of the obtained constitutive model parameters are verified.

Key words： 2024-T42 aluminum alloy Johnson-Cook constitutive model medium-low strain rate necking inversion correction

收稿日期: 2018-06-05 出版日期: 2020-01-15

引用本文:

张宇，王彬文，刘小川，惠旭龙，白春玉. 2024-T42铝合金低中应变率力学性能及本构关系[J]. 振动与冲击, 2020, 39(2): 249-254.
ZHANG Yu，WANG Binwen，LIU Xiaochuan，XI Xulong，BAI Chunyu. Dynamic mechanical property and constitutive relation of 2024-T42-aluminum alloy under medium-low strain rate. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(2): 249-254.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2020/V39/I2/249

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