泡沫铝夹芯梁四点弯曲性能试验研究
Experimental Study of Four-point Bending Performance of Aluminum Foam Sandwich Beam

通过准静态四点弯曲试验对泡沫铝夹芯梁的弯曲力学性能进行了测试，研究了它的破坏过程、破坏形态和典型荷载-位移曲线，分析了芯层厚度和面层厚度等参数对其弯曲力学性能的影响。结果表明，泡沫铝夹芯梁四点弯曲破坏过程历经三个阶段，呈现三种失效模式：整体弯曲破坏、局部屈曲破坏以及整体屈曲破坏；芯层厚度和面层厚度对夹芯梁的弯曲承载力和吸能效果有明显影响；在本试验参数范围内，芯层厚度为25mm，面层厚度为0.4mm时，夹芯梁具有最优弯曲力学性能。
Quasi-static four-point bending experiment was carried out to investigate the flexural performance of aluminum foam sandwich beam. The destruction process, failure mode and typical force-displacement curve were studied. The impact of parameters such as core layer thickness and surface layer thickness on the flexural performance of lauminum foam sandwich beam was analyzed. Results indicate that the four-point bending destruction process of aluminum foam sandwich beam undergoes three stages and presents three failure modes: overall bending failure, local buckling failure and overall buckling failure, respectively. The impact of core layer thickness and surface layer thickness of sandwich beam on maximum bending bearing capacity and energy absorption capacity is very obvious. In the range of parameters used in this experiment, when the core layer thickness is 25mm and surface layer thickness is 0.4mm, the aluminum sandwich beam presents the optimal flexural performance