(合肥工业大学 材料科学与工程学院，合肥,230009)
摘 要: 以泡沫铝为夹芯，长条薄铝板为面板制备泡沫铝层合梁，对泡沫铝层合梁的三点弯曲变形进行了研究。结果表明：泡沫铝层合梁的三点弯曲变形过程与泡沫铝的相似，层合梁的载荷曲线远远高于泡沫铝和面板的载荷曲线之和，显示出良好的层合效果；泡沫铝层合梁和泡沫铝承受载荷能力随着孔隙率的增大而逐渐减小；且同一孔隙率下泡沫铝层合梁的极限载荷点出现得比泡沫铝极限载荷点迟，极限载荷值约为后者的4～5倍；较厚面板和良好的孔结构可以提高泡沫铝层合梁载荷曲线，载荷分别增加70%和80%左右。泡沫铝层合梁在保持泡沫铝轻质同时，大大提高了其载荷极限，在工程应用中有着良好的应用前景。
关键字: 泡沫铝；层合梁；三点弯曲；孔隙率；极限载荷
foam aluminum sandwich beams
（Department of Materials Science and Engineering, Hefei University
of Technology, Hefei 230009, China）
Abstract:The bending property of the sandwich beams fabricated using the thin aluminum panel as its shell and Al-Mg alloy foam as its core was studied. The results indicate that the load-deflection curve of the sandwich beams under three-point bending is similar to that of foam aluminum. The load-deflection curve of sandwich beams is markedly higher than the sum of foam aluminum(alone) and its shell(alone) and show a favorable effect. The loading capacity of sandwich beams and foam aluminum decrease with increasing porosity of foam. The peak loading of sandwich beams appears at larger deflection comparing with that of aluminum foam. The thick panel and core structure can influence the load-deflection curve of sandwich beams, and the load increases about 70% and 80%, respectively. The peak loading of sandwich beams is higher than that of aluminum foams, and it can be widely used in engineering area.
Key words: foam aluminum; sandwich beams; three-point bending; porosity; peak loading
