泡沫铝填充金属薄壁圆管的实验和理论研究

利用实验研究与理论分析相结合的方法研究了泡沫铝填充金属薄壁圆管在准静态侧向压缩下的力学响应.基于能量法,建立了泡沫铝填充圆管和金属薄壁圆管在侧向均匀压缩时的瞬时侧向力、平均侧向力和总吸能的理论公式.对泡沫铝填充管与金属薄壁圆管进行了准静态侧向压缩实验,并且将实验结果与理论公式进行了对比,结果表明理论预测值与实验结果吻合较好.基于建立的理论分析模型,研究了管的几何尺寸以及泡沫铝材料的密度对结构的瞬时侧向力、平均侧向力、总吸能和比吸能的影响.结果表明,在准静态侧向压缩下,泡沫铝填充管的总吸能大于对应的金属薄壁圆管;泡沫铝填充管的侧向压缩力和总吸能随管长度、壁厚和直径的增加而增大;当填充材料泡沫铝密度增大时,填充管的总吸能与侧向压缩力均增加.

Experimental and Theoretical Study of Lateral Compression on Aluminum Foam-Filled Thin-Walled Metal Tubes

The mechanical response of aluminum foam-filled thin-walled metal tubes under lateral quasi-static loading was investigated experimentally and theoretically.Based on the energy method,some theoretical relations were derived to estimate the instantaneous and mean lateral forces,as well as the energy absorption of aluminum foam-filled tubes during the flattening process.Some lateral compression tests under quasi-static condition were carried out on the empty and foam-filled tubes using the universal testing machine.A good agreement was observed when comparing the theoretical results with the experimental ones.Additionally,the influences of geometrical dimension of tube and density of aluminum foam on the instantaneous and mean lateral forces,as well as energy absorption and specific energy absorption (SEA) were discussed based on the theoretical model.The study shows that the energy absorption of aluminum foam-filled tubes is higher than that of the corresponding thin-walled metal tubes.The total energy absorption and lateral force increase with the increases of tube length,thickness and diameter.When the density of aluminum increases,the total energy absorption and lateral force of foam-filled tubes increase accordingly.