Research On Liquid Tank Structures Under The Synergistic Effects Of Shock Wave And Fragments

Large surface warships are an important support for the Navy’s advancement.It is an important factor in protecting the territorial integrity of the sovereignty of the country.It plays a prominent role in the success or failure of the sea warfare.It not only has a strong ability to control the air and sea,but also has the ability to command and fight outstanding information deployment.The quantum leaps in explosive charge mass and hit accuracy of anti-ship missiles greatly threaten the vitality of large surface ships.This paper is based on the background that the semi-armor piercing anti-ship missiles penetrate into and then blast inside the large surface ships.Aimed at revealing the response characteristics of tank structures under in-cabin blast loading.This paper provides reference data for the design of the side multi-layer protective structure of a large surface warship.The structure of the liquid tank is the basic component of the multi-layer protective structure on the side of the surface ship.In order to quickly assess the vitality of surface ships under the attack of anti-ship missiles or shells,it is necessary to first determine the dynamic response characteristics of tank structures under the action of anti-ship missiles or bomb blast loads.Anti-ship missiles or shell explosions mainly result in two kinds of damage elements: shock wave and high-speed fragments.In this paper,the experimental and numerical simulation methods are used to carry out the study of the response characteristics of the liquid tank structure under the interaction of explosion shock wave and fragment.The major research work and conclusions are as follows:In-cabin explosion experiments were designed and carried out.The response process of the structure of the liquid tank under the blast shock wave of the TNT was revealed by the experimental method.The response characteristics of tank structures under the influence of different TNT equivalent sizes and different tank water levels were studied.Numerical simulation methods were used to explore the influence of the equivalent size of TNT,the thickness of the bulkhead wall,and the tank water level on the response of the tank structure.The response characteristics of the tank structure were analyzed in three aspects: the damage of the tank structure,the Gause point pressure,and the energy change of the tank material.In-cabin explosion test of the pre-open bore tank interior panel were designed and carried out.The response characteristics of the preopen tank structure under the explosion shock wave in the cabin are revealed by the experimental method.The relevant laws of wall plate deformation and cabin shock wave pressure in different shapes of pre-aperture tank inner panel under tank structure were explored.A numerical simulation method was used to investigate the influence of various prefabricated openings,such as the shape,number,and size of tank openings,on the response characteristics of tank structures.The response characteristics of the tank structure were analyzed in these aspects: the damage of the tank structure,the Gause point pressure.The explosion experiments of the structure of the pre-fragmented fragment and the TNT-powder coupling tank were designed and carried out.Firstly,the velocity law of the explosion formed by the standard cylinder warhead was calculated by the SPH-FEM method.Then the experimental method and numerical simulation method were used to reveal the response process of the tank structure under shock wave and fragment coupling.And the influence of the number of prefabricated fragments,the speed and other factors on the response characteristics of the tank structure was investigated.The response characteristics of the tank structure under the impact of shock wave and fragment coupling were studied.It provides a data reference for the response assessment of the side structure of a large surface warship and the design of a multi-layer protective structure on the side.