Study Of Structural Damage Under Multiple Underwater Explosion Impact Loads

Ships are an important loading tool for human activities at sea and an important combat weapon for national defense and strategic defense.The diversity,reliability,innovation,and practicality of ships provide strong support for China’s maritime economic and trade exchanges and strategic deployment.The research on underwater explosion damage to ships has always been regarded as a hot and difficult issue at home and abroad,with high application value and development prospects.Innovation and breakthroughs in this field have a decisive role in enhancing the explosive power,designing the structural performance of ships,and improving the explosion and impact resistance of ships.In recent years,scientists at home and abroad have carried out a series of explorations and studies on underwater explosions from three aspects: theory,experiment,and numerical value.In this context,this article will adopt the method of numerical simulation to mainly study and discuss the related issues of underwater multiple explosions.According to different angles and variable design conditions,this issue will be calculated and analyzed from two aspects: the cumulative damage caused by single point multiple underwater explosions to the cavity structure and the response of multiple point array explosion loads to the structure,and the propagation and attenuation process of explosion shock waves and the damage phenomenon caused by explosions to the structure will be observed.This article first describes and summarizes the development status of underwater explosions,summarizes the optimization and applicability of empirical formulas for underwater explosions in the literature based on theoretical analysis,and classifies and discusses the issues of underwater explosions from the perspective of experimental research and simulation calculations.Driven by these existing scientific research achievements and basic theoretical knowledge,this paper uses ANSYS/LS-DYNA numerical simulation software to study the structural damage caused by multiple underwater explosion shock loads.From different perspectives,the expansion and propagation process of underwater explosion shock waves in infinite waters and the factors affecting their propagation are observed.Finally,the power of explosives under different initiation methods and the energy attenuation of shock waves in different media are discussed,Based on the theoretical knowledge and experimental phenomena in the literature,and by comparing the numerical calculation results in this paper,it is proposed that the structures with different cross section shapes have strong explosion resistance and impact resistance,as well as powerful explosion modes and initiation environments,as well as ship materials and structures with strong explosion resistance.