泡沫填充铝合金多胞防爬器的吸能机理

Energy absorption mechanism of foam-filled aluminum alloy multi-cell anti-climber

提出了一类新型防爬器—泡沫填充铝合金多胞防爬器,并通过数值仿真结合试验验证的方法研究了其在轴向荷载作用下的能量吸收机理。结果表明,填充闭孔泡沫铝并提高其密度可以在峰值压溃力几乎不变的前提下有效提高铝合金多胞防爬器的能量吸收能力,且能够进一步提升蒙皮材料的吸能潜力。此外,当壁厚较小时,该防爬器极易产生不利于能量吸收的整体失稳;而壁厚增大时,防爬器的变形模式趋于稳定,总能量吸收增加,且蒙皮材料的能量吸收占比逐渐增加。

A novel anti-climber was proposed,namely foam-filled aluminum alloy multi-cell anti-climber,and the energy absorption mechanism under axial loading was investigated by the numerical simulation and test verification method.The results show that the energy absorption capacity of the aluminum alloy multi-cell anti-climber can be enhanced effectively by filing the closed-cell foam aluminum and improving the density of the foam under the premise that the peak crushing force is almost unchanged,and the energy absorption potential of the skin material can be further enhanced.In addition,when the wall thickness is small,the global instability is easy to occur for the anti-climber,which is not conducive to energy absorption;when the wall thickness increases,the deformation mode of anti-climber tends to be stable,and the total energy absorption increases,and the proportion of energy absorbed by the skin material gradually increases.