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国外对铝及其合金在高应变率下的动态力学性能的实验研究表明:纯铝是应变率敏感材料,其高应变率(10~3s~(-1))下的流动应力约比准静态(10~(-4)—10~(-3)s~(-1))下的提高20—60%;而时效硬化铝合金则对应变率不敏感,在10~(-4)—10~3s~(-1)的应变率范围内,其应力应变关系σ—ε随应变率(?)无明显变化,这常归因于沉淀硬化效应。对于国产纯铝和铝合金,尚无类似的实验研究报导。特别对于所谓不能热处理强化(非沉淀硬化)的变形铝合金的(?)敏感性,国内外文献均未见报导。本文用自制的分离式Hopkinson压杆冲击装置,在直到10~3s~(-1)的高应变率下,对国产非沉淀硬化防锈铝
Experimental studies on the dynamic mechanical properties of aluminum and its alloys at high strain rates abroad show that pure aluminum is a strain rate sensitive material and its flow stress at high strain rates (10 ~ 3s -1) is about quasi-static (10 ~ (-4) -10 ~ (-3) s ~ (-1))) increase 20-60%, while the age-hardening aluminum alloy is not sensitive to the strain rate, ~ 3s ~ (-1) strain rate range, the stress-strain relationship σ-ε with the strain rate (?) No significant change, which is often attributed to the precipitation hardening effect. For domestic pure aluminum and aluminum alloy, there is no similar experimental study reported. Especially for the so-called heat treatment can not be strengthened (non-precipitation hardening) deformation aluminum alloy (?) Sensitivity, domestic and foreign literature have not been reported. In this paper, with a self-made split Hopkinson strut impact device, under the high strain rate of 10 ~ 3s ~ (-1), the domestic non-precipitation hardening rust-proof aluminum