Compressive Properties Of Hollow Sphere/Al Syntactic Foams And The Explosion Resisting Performance Of Sandwich Panel

The field of military armor requires excellent armor materials.Therefore,this article takes military explosion protection as the research background,studies the factors affecting the anti-explosive performance of hollow sphere/aluminum-based porous composite sandwich panels,designs and prepares Al₂O₃ hollow sphere/Al porous composites,conducts performance tests and The dynamic response of its sandwich panel structure under air burst load was explored.In this paper,ANSYS/LS-DYNA is used to establish and verify the finite element model of the aluminum-based porous composite sandwich panel under air-blast load.The maximum deflection of the back explosion surface is the most important criterion for the anti-blast performance,and the residual deflection of the front panel,the maximum deflection of the front explosion surface and the energy absorption of the sandwich panel structure are used as auxiliary evaluation criteria to comprehensively evaluate the resistance of the sandwich panel structure.Explosion performance.Studies have shown that the panel material has almost no effect on the anti-explosive performance of the structure under low explosive load,while under high explosive load,the stronger RHA steel as the panel material can improve the anti-explosive performance of the structure.And the maximum deflection of the sandwich panel increases approximately linearly with the increase of the explosive amount.Under low explosive loads,the elastic modulus and peak stress of the core material are the main factors affecting the anti-explosive performance;under high explosive loads,the densification strain of the core material has a greater impact on the anti-explosive performance of the sandwich panel structure.And the increase in density will significantly improve the anti-explosive performance of the sandwich panel structure.Three kinds of Al₂O₃ hollow sphere/Al porous composite materials were prepared by pressure infiltration technology,and no interfacial reaction occurred.The composite material prepared with low-size Al₂O₃ hollow spheres has better mechanical properties,with a peak stress of about 95.36MPa and an energy absorption capacity of 47.34J/cm³.After T6 heat treatment,the peak stress increased by about 40MPa,and the energy absorption capacity also increased by about 20%.At high strain rates,the compressive strength of composite materials has a certain increase compared with the quasi-static compressive strength.The dynamic response of sandwich panel structure under explosive load is explored.Studies have shown that the motion response of the sandwich panel is that the sandwich panel is stationary,the explosion facing surface is compressed,the overall movement,rebounds until it is stable.The core stress response is no stress,stress increases and propagation attenuates,stress waves appear multiple times and the stress waves gradually attenuate and dissipate.The kinetic energy of the sandwich panel changes with the speed of movement of the sandwich panel;the main energy absorption of the sandwich panel is the plastic strain energy absorbed by the plastic deformation of the core layer.