Research On The Explosion Resisting Performance Of Novel Sandwich Panel With Composite Aluminum Foam Core

There are more and more terrorist bombing attacks on civil and military buildings in recent years, which not only harm the safety of the structures, but also cause casualties and thereby result in enormous destruction and immeasurable losses to the political and economic environment of local nations or regions and people's lives and property. In current situation that there is no clear specification in Chinese building codes for requirements of buildings against explosion impact, designers often enlarge section thickness to reinforce the ability of explosion resistence. But this method is neither economic nor reasonable and has many limitations. In this paper, a new kind of explosion and blast waves resistant structure which is a sandwich-like plate composed of steel-fome aluminum-steel, a plate with core layer made from hollow sphere/aluminum composite foam (composite foam aluminum for short) and outside layers made from steel, is proposed, followed by study on its explosion restance performance.The basic physical parameters of 80μm hollow sphere/1199Al composite are measured first, followed by investigation of its mechanical property on condition of low and medium deformation speed respectively. Specifically, quasi-static compression test and dart drop impact test are carried out, which yeild the density, elastic modulus, Poisson's ratio and compressive stress-strain curve of 80μm hollow sphere/1199Al composite. In comparison with common foam aluminum, it is found that composite foam aluminum has a better energy absorption capability and thus can be applied to the field of explosion resistance.ANSYS/LS-DYNA is employed to simulate the process of TNT explosion in infinity free air zone, from which the simulative peak overpressue is extracted. By comparing the simulative peak overpressue with that of empirical formulas and Chinese building codes, the reliability and applicability of numerical simulation are verified.The dynamic response of the sandwich-like plate subjected to blast loading is investigated. By changing the value of pararmeters including core board thickness, outside layers thickness, core board materials, outside layers material, distance between structure and explosion source and TNT equvalent, the influence of such parameters to structure is analyzed qualitatively and quantitatively, providing the reference data for the actual design of sandwich-like plate under explosion loading. At last, the model for a new kind of protective door which is filled with 80μm hollow sphere/1199Al composite in the space among the lattice grid beam in the middle of protective door and outside steel boards is proposed. In the ANSYS/LS-DYNA environment the response of two types of protective doors– doors with and without the composite foam aluminum energy absorption layer– under explosion loads is compared. The comparison shows that 80μm hollow sphere/1199Al composite can reflect shock wave, absorb the impact energy, display a good attenuation performance on explosion, control the deformation of the protective door effectively and delay its damage. Therefore this new kind of protective door will protect the people and equipments behind it to a great degree.