高比强泡沫铝合金中空层合圆管的性能

Performance of hollow cylindrical sandwich with high speicific strength foamed Al alloy core

设计制备了高比强泡沫铝合金中空层合圆管,测出了圆管的压缩应力-应变(σ-ε)曲线并研究了其性能.圆管与泡沫铝合金的压缩σ-ε曲线相似,但有较小波动;圆管的弹性模量与面板的弹性模量成线性关系,线性系数为η+α(0.5η2+0.3η)(1-η);泡沫铝合金中空层合圆管的紧实应变(εD)可用泡沫铝合金的εD表示.由σ-ε曲线计算出圆管的能量吸收性能,发现其吸能能力(W)大约比铝合金面板和泡沫铝合金的吸收能量之和高60%,吸能效率(E)高于60%.泡沫铝合金中空层合圆管具有轻质(ρ＜1)特性,但是其压缩比强度σ/ρ和压缩比刚度E/ρ是泡沫铝合金相应参数的3倍.

The hollow cylindrical sandwich of foamed Al alloy with high specific strength was prepared in order to improve the ability of energy absorption. The stress-strain (σ-ε) curves of the sandwich were measured and the properties of the hollow cylindrical sandwich were investigated. The compressive stress-strain curves of hollow cylindrical sandwich is similar to that of foamed Al alloy but have a little fluctuation. There is a linear relationship between elastic module of the hollow cylindrical sandwich and that of the face sheet, and the linear factor is η+α (0.5η2+0.3η)(1-η). The densification strain (εD) of the hollow cylindrical sandwich can be expressed by using that of foamed Al alloy. The energy absorption property (W, E) was obtained from the curves ofσ-ε, the energy absorption capacity W is about 60% higher than the sum of that of the face sheet and the foamed Al alloy, and the energy absorption efficiency E is higher than 60%. The p of the hollow cylindrical sandwich is <1 and the compression specific strength (σ/ρ) and compression specific rigidity (E/ρ) are 3 times that of foamed Al alloy respectively.