Damage Mechanism Research Of The Sandwich Panels Under Air Explosion

Ship structure above the waterline is threatened by modern anti-ship weapons,designing structure with excellent anti-explosion performance is meaningful to improve thevitality of the ship. Sandwich panels have superior mechanical properties, so they havebroad application prospects to ship structural design.After researching numerrical simulation technology of structural response under airexplosion, Non-linear FEM software MSC.Dytran was used to study damage perfomance ofthe U-type core sandwich panel and V-type core sandwich panel under air explosion, whichwas compared with the stiffened plate. After that, orthogonal experimental method wasapplied to analyze the affect of structural parameters to sandwich panels’ anti-explosionperformance. Finally sandwich panels were applied to ship superstructure compartments,static strength properties of cabins above were studied, and anti-explosion protectiveperformance of cabins with sandwich panels under air explosion was assessed. Mainconclusions are listed below.(1) Structural response under air explosion was successfully simulated with FEMsoftware. The response of the plate was coincident with theoretical result and experimentaldata.(2) The anti-explosion performance of sandwich panels was superior to that of stiffenedplate. Compared to stiffenened plate, the deformation modes of sandwich panels weredifferent, Easily crushed core reduced the impact load to the top face and had higher energyabsorption efficiency, making deformation of the top face reduced significantly, the speed,acceleration, and energy absorption of the top face were less than that of the stiffened plate.(3) With the increase of impact factor, the gap between stiffenened plate and sandwichpanels’ coupling force was increased. Energy absorption of top face was less than that of theplate in each impact factor. The increment of deformation, speed, and acceleration of platewas larger than corresponding indicators of top face, less than corresponding indicators ofbottom face.(4) The influence that structural parameters to the anti-explosion performance ofU-type core sandwich panel in a diminishing order was: inclination angle, top face sheetthickness, width of sandwich core member, bottom face sheet thickness. The influence thatstructural parameters to the anti-explosion performance of V-type core sandwich panel in adiminishing order was: width of sandwich core member, inclination angle, top face sheet thickness, bottom face sheet thickness. The comprehensive protective performance of thesandwich panels with optimal combination of sizes were improved significantly.(5) The static strength property of cabins with sandwich panels was superior to that oftraditional cabin, deformation and stress in traditional cabin were more than that of cabinswith sandwich panels, sandwich cores played an important role.(6) The anti-explosion protective performance of cabins with sandwich panels wassuperior to that of traditional cabin. The deformation, speed, and acceleration of the top faceof starboard sideboard were less than that of traditonal starboard sideboard. By absorbingenergy, sandwich core protected the top face of starboard sideboard, it is benefit to protectpersonal safety and reduce damage of equipments in the cabin.