Three-point Bending Fatigue Performances of Foam Aluminum Sandwich Panels
In order to explore the bending failure as well as fatigue life of sandwich structures under quasi-static conditions,the damage deformation process under three-point bending conditions was investigated with 304 stainless steel as panels and 7050 aluminum alloy substrate with closed-cell foam aluminum as the core layer.The static peak loads of different specimens were determined by the three-point bending load method.The bending life and damage forms were obtained by high-frequency fatigue testing machine.The S-N and P-S-N curves of different sandwich panels were plotted for comparative study.The results show that the bending failure of the sandwich plate under static state is consistent with the load-displacement curve.The failure mode of sandwich plate under fatigue state is relatively single,and 90％ of the specimens fail is due to core fracture.The fatigue life of sandwich panel increases with the increase of panel thickness.When the core density increases from 0.60 g/cm3 to 0.73 g/cm3,the fatigue life no longer continues to increase but begins to decrease.When the core density is 0.60 g/cm3 and the panel thickness is 0.6 mm,the fitting effect is the best and the sensitivity to the loading level is the lowest.This study provides a design basis for the subsequent practical engineering application of sandwich panels.
Foam aluminum sandwich panelThickness of the panelDensity of core layerFatigue life
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