钢面板泡沫铝夹心板的三点弯曲行为

采用胶粘法制备大尺寸钢质泡沫铝夹心板，测试夹心板的三点弯曲强度，分析面板厚度、芯层厚度对夹心板弯曲性能的影响规律，研究弯曲载荷作用下的夹心板失效机理。结果表明：钢质泡沫铝夹心板可承受很高的弯曲载荷，夹心板抗弯强度随着芯层泡沫铝厚度的提高而提高。增加钢面板的厚度，夹心板抗弯强度整体呈增强趋势。当面板厚度为8 mm、芯层厚度为50 mm时，夹心板的极限抗弯强度可达66.06 kN。芯层泡沫铝内泡壁表面的大尺寸裂纹是夹心板在弯曲载荷作用下失效的主要原因；采用熔体发泡法制备的泡沫铝板材，因冷却强度过大而导致的附加应力使泡壁的强度下降，也是影响夹心板力学性能的主要因素。

Three-point bending behavior of aluminum foam sandwich with steel panel

Static three-point bending tests of aluminum foam sandwiches with glued steel panel were performed. The deformation and failure of sandwich structure with different thicknesses of panel and foam core were investigated. The results indicate that the maximum bending load increases with the thickness of both steel panel and foam core. The failure of sandwich can be ascribed to the crush and shear damage of foam core and the delamination of glued interface at a large bending load. The crack on the foam wall developed in the melting foam procedure is the major factor for the failure of foam core. The sandwich structure with thick foam core and thin steel panel has the optimal specific bending strength. The maximum bending load of that with 8 mm panel and 50 mm foam core is 66.06 kN.