Research On Explosion And Shock Resistance Characteristic Of Catamaram Structure

The ability of explosion and shock resistance of warship is an important indicator for warship's survivability, which has been a major concern and focus of navy army around the world. Considering water can not be compressed and the role of bubble pulsation can not be neglected, the damage and impact caused by underwater non-contact explosion to warships is particularly serious. As a new type of surface vessel, SWATH catamaran's ability of explosion and shock resistance has never been investigated systematically.Due to its structural uniqueness and advantage in some respects, its ability of explosion and shock resistance is different from the ability of single hull ship. Therefore, to ensure that SWATH catamaran possess strong combat capability and vitality, the ability of explosion and shock resistance of SWATH catamaran is investigated, and the following reseaches are conducted:Firstly, research status concerning SWATH catamaran's explosion and shock resistance capability is summarized, and the shortage in this field is understood. Secondly, accroding to the finite element model of SWATH catamaran, the shock wave pressure is obtained by the Geers and Hunter model. The method of acoustic-structural couple is adopted to simulate ship response in shockwave phase, boudary element method and nonlinear program of ABAQUS software coupled solution is adopted to slove the ship response in bubble pulsation phase.Thirdly, numerical algorithms is adopted to simulated the ship structural response in typical condition without the bubble pulsation, shock response patterns of SWATH catamaran in different condition are summarizesd, the characteristics of shock environment of SWATH catamaran under shockwave impact are proposed; according to damage of local strength of SWATH catamaran subjected non-contact underwater explosion shock waves, ship's weak region of large deformation is analyzed, the characteristic of local damage of SWATH catamaran is obtained subjected non-contact underwater explosion, and fitted forumla of damage radius, critical radius and safety radius of SWATH catamaran are summarized according to the calculation resultsFinally, the average value of Von.Mises stress in the cross section of SWATH catamaran, plastic strain and some other overall responses subjected the load of shockwave and bubble pulsation arc analyzed thoroughly, and the overall response of ship influenced by the dosage of dynamite, depth of water, the angle of explosion and the distribution of explosive point along with the ship length are summarized.