(合肥工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，合肥,230009)
摘 要: 以泡沫鋁為夾芯，長條薄鋁板為面板制備泡沫鋁層合梁，對泡沫鋁層合梁的三點(diǎn)彎曲變形進(jìn)行了研究。結(jié)果表明：泡沫鋁層合梁的三點(diǎn)彎曲變形過程與泡沫鋁的相似，層合梁的載荷曲線遠(yuǎn)遠(yuǎn)高于泡沫鋁和面板的載荷曲線之和，顯示出良好的層合效果；泡沫鋁層合梁和泡沫鋁承受載荷能力隨著孔隙率的增大而逐漸減小；且同一孔隙率下泡沫鋁層合梁的極限載荷點(diǎn)出現(xiàn)得比泡沫鋁極限載荷點(diǎn)遲，極限載荷值約為后者的4～5倍；較厚面板和良好的孔結(jié)構(gòu)可以提高泡沫鋁層合梁載荷曲線，載荷分別增加70%和80%左右。泡沫鋁層合梁在保持泡沫鋁輕質(zhì)同時(shí)，大大提高了其載荷極限，在工程應(yīng)用中有著良好的應(yīng)用前景。
關(guān)鍵字: 泡沫鋁；層合梁；三點(diǎn)彎曲；孔隙率；極限載荷
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
