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利用配备自动组装系统和高温加热系统的直径为5 mm的Hopkinson压杆,对温度在20℃~400℃、应变率在(5~14)×103s-1范围内LY12铝的动态压缩力学性能进行了实验研究.实验中采用波形整形技术,有效地消除了入射波的高频振荡,提高了测试精度.实验结果表明:当实验温度低于200℃时,温度的影响较小,而高于200℃时,材料的温度软化效应将十分明显,且随着温度的升高,流动应力逐步降低;LY12铝的性质接近于线性硬化材料,随温度的升高,其硬化模量逐步降低;在(5~14)×103s-1应变率范围内,LY12铝的动态压缩性能的应变率效应并不明显.
The dynamic compressive mechanical properties of LY12 aluminum in the temperature range of 20 ℃ ~ 400 ℃ and the strain rate in the range of (5 ~ 14) × 103s-1 were obtained by using Hopkinson pressure bar with diameter of 5 mm with automatic assembly system and high temperature heating system. The experimental research is carried out.In this experiment, the waveform shaping technique is used to effectively eliminate the high-frequency oscillation of the incident wave and improve the testing accuracy.The experimental results show that when the experimental temperature is below 200 ℃, the temperature has little effect, 200 ℃, the softening effect of the material will be very obvious, and with the increase of temperature, the flow stress will decrease gradually. The property of LY12 aluminum is close to that of the linear hardening material. With the increase of temperature, the modulus of elasticity of LY12 decreases gradually. (5 ~ 14) × 103s-1 strain rate range, the dynamic strain-rate effect of LY12 aluminum is not obvious.