泡沫铝夹芯双方管结构准静态轴压性能的实验研究

Experimental investigations on the quasi-static axial crushing of foam-filled double square columns

对几种泡沫铝夹芯方管结构的准静态轴压性能进行了实验研究。结果表明,较空管及泡沫铝夹芯单管结构,泡沫铝夹芯双管结构的承载能力及能量吸收效率明显得到增强。双管夹芯结构中外管撕裂模式的结构行程利用率和能量吸收效率高于相应的外管周期折叠模式。而泡沫铝四角填充方式提高了双管夹芯结构相同变形模式下的能量吸收效率和结构变形的稳定性。同时研究了内管管壁及材料强度对泡沫铝夹芯双管结构的影响。随着内管壁厚增大,双管夹芯结构的能量吸收效率提高,而内管材料强度影响不明显。

Experimental studies on the quasi-static axial crushing of foam-filled double square columns were carried out. It was revealed that the load carrying capacity and the energy absorption efficiency of the foam-filled double tube structure are higher than those of the corresponding empty and foam-filled single square columns. For the foam-filled double tube structure, the stroke efficiency and the energy absorption efficiency under the outer tube tear failure mode is higher than that under the progressive buckling mode. And a new filling method, i.e. foam filled in corners of the double square column, is tested and it is found that its deformation mode is much stable and the energy absorption efficiency is higher. The effect of the inner tube thickness and material on the response was also investigated. It shows that, thickening the inner tube will increase the energy absorption ability. But enhancing the inner tube material affects the structural response little.