Research On Explosion-proof Performance Of Closed-cell Aluminum Foam Sandwich Panel

Aluminum foam material has excellent comprehensive properties due to its special porous structure.The porous foam structure makes it a good energy absorption platform,which has a good attenuation effect on the wave.According to this characteristic,scholars at home and abroad often carry out research on impact and explosion-proof performance.The aluminum foam material itself does not have the characteristics of explosion-proof energy absorption,and it often needs to be compounded with a steel plate to form a sandwich panel in order to exert its excellent energy absorption effect.At present,domestic and foreign researches on aluminum foam materials are mostly static compression and dynamic impact properties,only a few scholars have conducted research on the explosion-proof performance of aluminum foam materials,the research methods are mostly simulation calculations using numerical analysis software,relatively few explosion experiments have been studied,mainly due to the difficulty in developing explosion experiments.In modern warfare,the shock waves generated by the explosion of landmines,bombs,missiles and other devices are the main factors causing serious injuries to human bodies and military facilities.For this,the state has put forward clear explosion protection requirements for military vehicles:while being able to protect the shock waves generated by the explosion,it also reduces the weight of equipment and improves mobility.Aluminum foam sandwich panel has the advantages of light weight,anti-fragment damage,shock wave absorption and so on.In response to the national demand,this article conducts research on the explosion-proof performance of closed-cell aluminum foam sandwich panels.The main research contents are as follows:This paper is based on the laboratory’s mature process of positive pressure foaming,and uses industrial equipment to produce large-sized(820mm×520mm×150mm),high-performance aluminum foam materials using the positive pressure foaming process.After continuously optimizing the process parameters and improving the engineering equipment,a high-quality aluminum foam material with controllable cells and high consistency was prepared.The controllable range of pore diameter was 1-5mm and the controllable range of density was 0.4-0.65g/cm3.Two kinds of aluminum foam materials of 0.42g/cm3 and 0.65g/cm3 were selected for quasi-static compression experiments.The experimental results show that the aluminum foam produced by the positive pressure foaming method has a more energy-absorbing platform than the aluminum foam material prepared by the ordinary melt foaming method.The explosion-proof model of aluminum foam sandwich structure was established by using LS-dyna simulation software,and numerical simulation calculation of aluminum foam sandwich structure was performed for different constraint types,different core plate densities and different explosion equivalents.The research shows that the explosion-proof structure of the aluminum foam sandwich panel has a significant energy absorption effect compared to the steel plate without the aluminum foam,and the higher the density of the filled aluminum foam,the better the energy absorption effect;from the center point of the substrate The speed change can be concluded that the explosion-proof structure of the aluminum foam sandwich panel can reduce the explosion speed caused by the explosion load on the substrate,and delay the time when the explosion speed reaches its peak.Guided by the results of numerical simulation experiments,the research on the explosion-proof performance of aluminum foam sandwich structures carried out.Three sets of aluminum foam sandwich explosion-proof structures with different structures were designed,and the explosion experiments of 800gTNT and 6kgTNT were carried out.Studies have shown that the aluminum foam explosion-proof structure can only produce energy absorption through the cooperation of the panel and the core plate.The panel on the front side should not be too thin,especially when experiments with large explosion equivalents are performed.Insufficient strength.The back burst panel mainly plays a supporting role,and can fully deform the aluminum foam core board.Through the analysis and summary of experience,the optimized third group of explosion experiments has obtained relatively good experimental results:the protection structure is relatively complete,no cracks appear on the front explosion surface and the back explosion surface,and the deformation of the protective substrate is measured to be 106mm.The experiment of 6kgTNT aluminum foam explosion-proof structure is carried out in accordance with NATO AEP-55 standard,which has certain research value for the research on the explosion protection of military vehicle chassis.