泡沫铝填充金属波纹板耦合增强机理研究

Enhancement mechanisms of aluyminum foam-filled metallic corrugated sandwich panels

摘要:

将闭孔泡沫铝填充到空心金属波纹板孔隙当中即可获得泡沫铝填充波纹板结构,对其准静态压缩吸能特性进行实验表征,研究表明泡沫铝填充波纹板其应力远高于泡沫铝与空心波纹板二者单独压缩应力之和,表现出明显的耦合增强效应,其单位质量峰值压缩强度及单位质量能量吸收率(SEA)可分别高达对应空心结构的6.3及14.8倍,即使和泡沫铝相比其SEA仍可提高50%以上。进一步通过对空心波纹芯体结构的屈曲变形模式研究表明,泡沫铝的填充给予了波纹芯体单元足够强的横向支撑,使其变形模式转变为空心结构难以产生的更加高阶的屈曲变形模式,屈曲波长变短,产生耦合增强效应。

Abstract:

Aluminum foam-filled corrugated sandwich panels were fabricated by filling closed cell aluminum foam into the spaces of empty corrugated cores, and its out-of-plane compressive behaviors were investigated experimentally which showing significant coupling enhancement effects. The peak stress per unit mass and specific energy absorption (SEA) of the foam-filled panels could be as large as 6.3 and 14.8 times compared to that of the corresponding empty one. Compared to aluminum foam which have excellent energy absorption performances, SEA already have advantages with increasment of 50%. Peak compressive strength of corrugated panels varies with relative density were predicted theorically, and showing that the buckling model of the corrugated core web changed from low order to high order due to foam filling. The high order have shorter wavelength compared to the lower one and requires much larger compressive load to occur, therefore, a significant coupling enhancement effect was caused.