泡沫铝夹芯板弯曲疲劳寿命及失效模式研究

Study on Bending Fatigue Life and Failure Mode of Aluminum Foam Sandwich Panels

采用三点弯曲实验对粘结法制备的泡沫铝夹芯板疲劳性能进行了实验研究,分析了不同面板厚度和芯层密度对夹芯板弯曲疲劳寿命及失效模式的影响。结果表明:泡沫铝夹芯板的平均寿命由面板厚度和芯层密度共同决定,疲劳寿命随着面板厚度及芯层密度的增加而增加;复合结构的弯曲疲劳主要失效模式为芯层剪切失效模式。研究结果可为泡沫铝夹心板的实际工程设计及应用提供参考。

The fatigue properties of aluminum foam sandwich panels prepared by bonding method were studied by three-point bending test. The effects of different panel thickness and density of core layer on the bending fatigue life and failure mode of the sandwich panel are analyzed. The results show that the average life of foamed aluminum sandwich panel is determined by the thickness of the panel and the density of the core layer. The fatigue life increases with the increase of the thickness of the panel and the density of the core layer. The main failure mode of bending fatigue of composite structure is shear failure of core layer. The results can provide reference for the practical engineering design and application of aluminum foam sandwich panel.