Research On Energy Absorption Mechanism And Optimization Technology Of Composite Sandwich Structure For Protective Vehicles

In order to cope with the damage of military vehicles and the safety of passengers in modern warfare,protective vehicles need to consider the balance between overall vehicle protection performance,lightweight structure and passivity at the beginning of structural design,so that protective vehicles can suitable for all forms of combat.Based on this,combined with theoretical analysis,experimental research,explosion simulation and optimization design technology,this paper study the dynamic response of a certain type of protective vehicle under explosive impact load,and introduce a composite sandwich structure in the bottom lightning protection component structure design.The multi-objective optimization design method is used to improve the lightning protection component structure.The main methods are as follows:Firstly,through the theoretical analysis and experimental research,the mechanical properties of three different forms of core layer structure under quasi-static state are studied.The energy absorption mechanism of the core layer structure is obtained,and the propagation law of stress wave and the explosion in the composite sandwich structure are analyzed.Under the impact of the structural deformation mode,the energy absorption mechanism and anti-explosion mechanism of the composite sandwich structure are obtained,which lays a theoretical foundation for the application of the composite sandwich structure in the design of the whole vehicle lightning protection component.Then,using the gantry structure to complete the explosion test and simulation analysis of the foam aluminum composite sandwich structure,the ALE simulation analysis can accurately simulate the explosion impact problem.Through the simulation analysis of three composite sandwich structures under different parameters,the advantages and disadvantages of the anti-explosion performance of the three composite sandwich structures are obtained.Then the finite element modeling of the whole vehicle structure and the acquisition of the dynamic parameters of the lightning protection component materials are completed.Through the simulation analysis of the vehicle explosion of several kinds of bottom lightning protection components,the lightning protection components of the out-of-cell honeycomb composite structure are finally proposed,and the simulation results are compounded.The sandwich structure lightning protection component can improve the anti-explosion performance of the whole vehicle.In the case of ensuring the safety of the occupants in the vehicle,the multi-parameter and multi-objective optimization design of the out-of-plane honeycomb composite lightning protection component is improved,and the improved anti-explosion performance of the vehicle structure is improved,and the lightweight design of the lightning protection component structure is completed.Finally,the optimization design results are verified by the vehicle explosion test.The research process and results of this paper have certain guiding significance in the design and lightweight of lightning protection components at the bottom of protective vehicles.