Research Of The Failure Of Sideboard Under Explosive Load

The mechanical behaviors and failure modes of sideboard structures on large surface ships under explosive load is studied in this paper.According to the attack characteristics and damage modes of Harpoon anti-ship missiles,which can through the outer plate and enter the cabin of the ships and then explode,the dynamic response process and plastic deformation failure of the composite structure sideboards with stiffeners under the explosive damage of anti-ship missiles are analyzed.Firstly,the theoretical model of blast shock wave parameters is established based on the detonation theory and the shock wave propagation theory.The explosive load is simplified to a triangular load which varies linearly with time.According to the basic assumptions and the simplify method of space sharing,the theoretical mechanics calculation model is established with the theory of elastic-plastic deformation and plastic hinge theory.The reliability of the simplified theoretical model and the numerical simulation model are verified by comparing the calculated deflection values with the theoretical calculated deflection values as well as the experimental values.The plastic region of sideboard under high explosive load is derived according to the plastic deformation theory of thin plates.A numerical simulation model corresponding to the experiment is established.And then The range of plastic region calculated by numerical simulation is compared with the data calculated by theory as well as the experimental results,which verified the reliability of the numerical simulation model.The composite structure sideboards under explosive loads is established by the finite element software AUTODYN,with the ship steel,99.5% ceramic and Kevlar fiber as the sandwich layer respectively.The deflection deformation values and the plastic regions of the composite structure sideboards made of different materials under explosive load are calculated respectively by using the fluid-solid coupling Euler-Lagrange algorithm.How the factors such as the stiffeners,the thickness of sideboards,the combination way of sideboards and the splicing of sideboard elements have influenced the dynamic response of composite structure sideboards with stiffeners under the explosive load is studied by numerical simulation method.The influences of stiffeners,the thickness of sideboards,the combination way of sideboards and splicing of sideboard elements on the severe plastic deformation failure mode of composite structure sideboards with stiffeners are analyzed,which can provide a basis for determining the failure of plastic mode.