Research On Blast Resistance Of Two Different Pyramidal Lattice Sandwich Panels

Pyramidal lattice sandwich panels(PLSP)which is usually used as armour for structures and vehicles,have the advantages of light,high specific strength,high specific stiffness ect..On the battlefield,mobality,apart from blast resistance performanc,is another key character to military vehicle.In this paper,the simulations of pyramidal lattice sandwich panels with different arrangements under the impact of explosion load were carried out and validated.The dynamic responses of these two types of panels were analyzed and compared via aspects of areal specific energy absorbtion(ASEA)and maximun back facesheet displacement(Max D).Meanwhile,the multi-objective optimization design of the pyramidal lattice sandwich panels was conducted to seak their blast resistance potential.Firstly,two pyramidal lattice sandwich panels with different arrangement,high density pyramidal lattice sandwich panels(HDPLSP)and low density pyramidal lattice sandwich panels(LDPLSP),were simulated and validated.On the basis of which,the dynamic response characteristics of the two sandwich panels under the same explosive load are studied,and the results are compared and analyzed.The results show that the anti-blast performance of the low density pyramidal lattice sandwich panel is better than that of the high density pyramid lattice sandwich panel.Secondly,the influence of the geometric parameters,including upper and lower panel thickness,core layer height,core struct section dimensions,angle between core web and bottom panel,and the stand-off distance(SoD)were analyzed and compared.The results show that the geometrical parameters of the sandwich panel and So D have significant effects on anti-blast performance,which lays the foundation for multi-objective optimization.Finally,optimizations for the two types of sandwich panes were conducted.The geometrical parameters and SoD were choosen as design variable,the maximum back face sheet displatement(Max D),areal specific energy absorption(ASEA)were choosen as optimizaion targets ans radial basis function(RBF)method was used to create the response surfaces.The Pareto fronts of the two types of sandwich panels obtained by NSGA-II algorithm were analyzed and compared.The results show that LDPLSP has better energy absorption potential when MaxD is low while HDPLSP has better energy absorption potential when MaxD is relative high.Additionally,it could be tell from the Pareto front that LDPLSP has larger design space.