Numerical Study On Impact Resistance Of Foam Metal Sandwich Panels Under Impact Loading

Porous metal materials have excellent properties such as low density,high strength,energy absorption,sound insulation,easy production,and buffer energy absorption.They are widely used in the fields of noise reduction,buffer absorption,shielding and shielding,among which foam metal and honeycomb.Metal is the most common.In order to study the impact resistance and energy absorption characteristics of foam metal sandwich panels under blast loading,the finite element calculation software was used to systematically respond to the response mechanism of honeycomb sandwich panels and double-layer foam aluminum sandwich panels under impact loading.The main research contents and results are as follows:(1)The dynamic response of square honeycomb aluminum plate under blast loading was studied.The three-dimensional finite element model of TNT explosive-front and back panel-honeycomb core-air was established.The deformation of honeycomb aluminum plate under impact load was analyzed by ALE multi-material fluid-solid coupling algorithm.Mechanism,plastic deformation,energy absorption,etc.and optimize its structure.The results show that with the increase of panel thickness and core height,the anti-explosion performance of honeycomb aluminum plate under impact load is obviously improved,the ability to resist deformation is enhanced,and the residual deformation of the structure is smaller;with the increase of the incident angle of detonation,The smaller the residual deformation of the structure,the larger the incident angle is.The effect is more obvious.For the given side length and impact area of the structure,the thickness of the front and rear panels is reasonable to facilitate the residual deformation of less structure.At the same time,the plasticity of the structure is found.The smaller the deformation,the smaller the energy absorbed.According to the main bearing role of the structure in engineering,the relationship between energy absorption and plastic deformation needs to be balanced.The research results can provide some reference for the anti-explosion design of square aluminum honeycomb panels.(2)The dynamic response of double-layer foam aluminum sandwich panels under impact load was studied.A three-dimensional finite element model of TNT explosive-double foam aluminum sandwich panel-air was established.The double-layer foam aluminum plate was analyzed by ALE multi-material fluid-solid coupling algorithm.Elastoplastic deformation mechanism and energy absorption characteristics under impact load.The results show that under the same loading conditions,the double-layer foam aluminum sandwich panel has stronger impact resistance than the single-layer foam aluminum sandwich panel;as the thickness of the panel increases,the plastic deformation of the foamed aluminum panel under impact load Significantly reduced,at the same time,the overall energy absorption is reduced,the upper panel and the upper sandwich layer occupy a larger total energy absorption;changing the thickness configuration of the panel reveals that the positive gradient plate structure is superior to the panel structure of the same thickness.The research results can provide a reference for designing high-quality impact-resistant double-layer foam aluminum sheets.