Research On The Lightning Protection Characteristics And Structural Design Of The V-type Structure At The Bottom Of The Armored Vehicle

By reference to the NATO STANAG-4569 standard,research on a light armored vehicle’s anti-mine performance was carried out.The dynamic response of the Ⅴ-shaped structure under the impact of the explosive shock wave was studied by simulation.The response of the panel deformation was analyzed,as well as the compression ratio of the foamed aluminum core,the energy absorption and acceleration of the structure.The anti-explosion performance effected by the Ⅴ-shaped plate’s angle,the aluminum foam’s density and the thickness ratio of panel were considered.This research shows that the Ⅴ-shaped structure has an offset unloading effect to the explosive shock wave,which makes the pressure load lower compared with the flat structure whlie bearing the same blast load.As the plate’s angle decreases,the Ⅴ-shaped structure’s ability to unload shock waves was increased,and the maximum deformation,energy absorption,and acceleration peaks of the structure are getting smaller.Therefore,installing a small angle Ⅴ-shaped structure on the vehicle can improve its anti-mine performance.However,immoderate small angle will reduce the distance between vehicle bottom and the ground,which affects the vehicle’s passability.In the composite protective structure which uses aluminum foam as the energy absorbing core layer,the aluminum foam produces"Progressive"deformation under the compression of the front panel.The compression deformation of the core layer is the main energy absorption mode of the composite protection structure,its energy absorbed rate is up to 54.5%.As the density of the aluminum foam core decreases,the core’s compression rate increases,the energy absorption capacity of the composite structure increases,and the amount of deformation and acceleration of the rear panel decreases.Under the condition that the total thickness of the front and rear panels is constant,the deformation resistance of the composite structure and its ability to absorb the shock wave energy are in contradiction.The thinner the front panel,the higher the compression ratio of the aluminum foam core layer,and the stronger the shock wave energy absorption capacity,but the larger the deformation of the rear panel of the structure.Conversely,the thicker the front panel,the smaller the overall deformation of the protective structure,but the smaller the structure’s energy absorption,and the energy absorption characteristics of the core layer are not fully utilized.Based on the research of the above factors,the optimal design parameters of the Ⅴ-shaped anti-mine structure are obtained,which angle is 170°,the density of aluminum foam is 0.41/g·cm^-3,and the thickness ratio of the front and rear panels is 1.5.With reference to these parameters,the anti-mine structure of this light armored vehicle is designed,and the anti-mine performance of the vehicle is measured.Without this structure,the vehicle fails to meet NATO level 2 standards,nevertheless,while equipping the anti-mine structure,the deformation of the vehicle bottom deck was reduced from 74.3%to 92.5%,and the peak pressure of the passenger’s chest was reduced from 44.7%to 71.3%,which achieves NATO 2 Level standard.