为研究2A16铝合金的中应变率力学性能及热处理状态对其应变率敏感性的影响，利用电子万能试验机和高速液压伺服试验机对其（O状态和T4状态）进行常温下准静态和中应变率力学性能试验，得到不同应变率下的应力应变曲线，并基于修正的Johnson-Cook 本构模型对其进行拟合。结果表明：在应变率10-4~102s-1范围内，热处理状态对2A16铝合金的应变率敏感性有较大影响，其中2A16-O状态铝合金的应变率敏感性较强，而2A16-T4状态铝合金的应变率敏感性较弱，但两种材料均具有较强的应变硬化效应；此外，修正Johnson-Cook 本构模型的拟合结果与试验结果吻合很好，能够很好表征材料的动态力学行为。
Abstract
In order to study the dynamic mechanical property of 2A16 aluminum alloy and the influence of heat treatment on its strain rate sensitive property, tests for 2A16 aluminum alloy(heat-treated condition O and T4) under quasi-static and intermediate strain rate were performed by using an electronic universal testing machine and a high velocity hydraulic servo-testing machine at room temperature. The stress-strain curves under different strain rates were obtained, and a modified Johnson-Cook constitutive model was fitted. The results show that the heat-treated condition has a big influence on the strain rate sensitive property of 2A16 aluminum alloy between 10-4~102s-1, and the strain rate hardening effect of 2A16-O aluminum alloy is obvious but which for 2A16-T4 aluminum alloy is not obvious, in addition, the strain hardening effect is obvious for both of the materials between 10-4~102s-1. Moreover, the modified Johnson-Cook constitutive model can predict the test results very well.
关键词
2A16铝合金 /
热处理状态 /
中应变率 /
应变率效应 /
Johnson-Cook模型。
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Key words
2A16 aluminum alloy /
heat-treated condition /
intermediate strain rate /
strain rate effect /
Johnson-Cook constitutive model.
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参考文献
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