Experimental Research And Numerical Simulation Of Shear And Penetration Resistance Of Aluminum Foam Sandwich Panel

Foamed aluminum is a porous metal material with light weight,high strength,and excellent sound and energy absorption performance.In actual engineering,foamed aluminum is usually used as a filler,which can exert excellent physical properties in the structure.In this paper,the shear resistance and penetration resistance of the foamed aluminum sandwich panel are studied through experiments and numerical simulations.First,a shear test was carried out on the aluminum foam sandwich panel,the damage morphology and failure process of the sandwich panel were analyzed,and the influence of the thick Ness of the surface layer,the porosity of the core layer aluminum foam and the thick Ness of the core layer on the mechanical properties of the aluminum foam sandwich panel was investigated.Impact.The results show that the thick Ness of the surface layer and the porosity of the core aluminum foam have an important effect on the ultimate bearing capacity and energy absorption of the aluminum foam sandwich panel,and the core layer thick Ness mainly affects the length of the platform stage of the load-displacement curve of the sandwich panel.Then,a numerical model of the foam aluminum sandwich panel was established,the failure mode of the sandwich panel was analyzed,and the influence of the thick Ness of the upper and lower layers and the width of the shear band on the mechanical properties of the sandwich panel was found.Under the premise that the total thick Ness is constant,increasing the thick Ness of the upper layer can effectively improve the ultimate bearing capacity and energy absorption of the sandwich panel,and the law of the ultimate bearing capacity and energy absorption of the sandwich panel with the width of the shear band is obtained.Finally,the penetration test was carried out on the foam aluminum sandwich panel,the destruction process of the sandwich panel was analyzed,and the influence of panel thickness,foam aluminum porosity and impact speed on the mechanical properties of the sandwich panel was explored.It was found that the panel thickness and the foam aluminum Porosity has an important influence on the ultimate bearing capacity and energy absorption of sandwich panels.The finite element model of the foam aluminum sandwich panel correspond to the penetration test was established.By comparing the penetration test and the numerical simulation of the failure form and energy-time curve,it was verified that the model has good applicability.The energy absorption and panel deformation of each part of the sandwich panel are analyzed under different parameters.It was found that as the thick Ness of the panel increases and the porosity decreases,the deformation of the panel shows a decreasing trend.The effects of low-speed impact and high-speed impact,core layer thick Ness,impact angle and punch type on the energy absorption of foam aluminum sandwich panels are analyzed.The results show that with the increase of the impact speed,the energy absorption of the foam aluminum sandwich panel tends to a certain value;with the increase of the thick Ness of the core layer and the impact angle,the energy absorption of the sandwich panel shows an increasing trend;cylindrical punch Under the action,the energy absorption of the sandwich panel is higher than the energy absorption of the sandwich panel under the action of the hemispherical punch and the conical punch.