泡沫铝夹芯板压入和侵彻性能的实验研究

利用MTS和落锤试验机研究了由复合材料面板和闭孔泡沫铝芯层组成的夹芯板结构在压入和侵彻时的变形和失效行为,并通过引入无量纲参数——能量吸收效率因子,探讨了一些关键参数对夹芯板压入和侵彻性能以及能量吸收性能的影响,如冲击能量、面板厚度、芯层厚度及相对密度、压头/锤头形状和边界条件等。结果表明夹芯板的破坏主要集中在压头作用的局部区域内。夹芯板的能量吸收效率对其结构参数比较敏感,增加上层面板厚度、芯层厚度或芯层相对密度能够有效地提高夹芯板结构的能量吸收能力以及抵抗压入和侵彻的能力,而下层面板厚度的对夹心板抗侵彻性能的影响不明显。不同的压头/锤头形状和边界条件对泡沫铝夹芯板的压入和侵彻响应以及能量吸收性能影响明显。

Tests for indentation and perforation of sandwich panels with aluminium foam core

Indentation and perforation behaviors of sandwich panels with composite face sheets and closed-cellaluminum foam core are investigated experimentally. Quasi-static and low-velocity impact tests are carried out by usingan MTS system and a drop hammer tester, respectively. Experimental results show that the deformation and failure of thesandwich panels is roughly confined to the area directly underneath the indenter and the material outside the contact areaappears to be intact. Effects of some key parameters on the overall energy absorption behavior of the panels are exploredand compared through an energy-absorbing effectiveness factor, such as impact energy, face sheets and core thickness,core density and indenter nose shape, as well as boundary conditions.