泡沫铝层合圆管压缩和吸能性能的研究

Investigation of Compression Capability and Energy Absorption of Foam Aluminum Cylinder Sandwich

以泡沫铝为夹芯，不锈钢圆管为面板制备层合圆管，研究了层合圆管在压缩条件下的变形行为和能量吸收性能。研究表明：层合圆管的压缩变形方式与空管相比发生了改变，由不对称变形模式变为轴对称变形模式，其所承受的载荷约为泡沫铝和不锈钢管所承受的载荷之和的1．5倍；层合圆管的载荷一位移曲线平台段锯齿形波动数与形成的曲屈圈数呈现对应关系，样品高度、直径，粘结方式对曲屈圈的形成数目有一定的影响；层合圆管的吸能能力远大于不锈钢圆管和泡沫铝吸收的能量之和，约为后者的1．5～2倍。

Compression deforming activity and energy absorption ability of aluminum foam cylinder sandwich under pressing was studied. The sample was fabricated by stainless steel tube as its shell and foam aluminum as its core. The results indicate that the deforming mode of the cylinder sandwich is changed from ＂diamond mode＂ to ＂concertina mode＂; its load is 1.5 times higher than the sum of foam（alone）and tube（alone）. The plateau region of the load-displacement curve exhibits a marked serration which is clearly related to the formation of the cylinder folds; the sample height, diameter, melt mode has influence on the folding. The energy absorption ability of aluminum foam cylinder sandwich are generally found to be 1.5～2 times higher than the sum of foam（alone） and tube（alone） ,and the energy absorption ability of the cylinder sandwich increases more quickly as the increasing with the displacement.