Research On Non-explosives Underwater Shock Wave Loading Technology And Propagation Characteristics

Since the beginning of World War II in the last century,with the outbreak of maritime wars,the protection of ship structures has received the attention of all countries.Similarly,the current world economy is developing rapidly,and the safety of ships in maritime trade needs to be guaranteed.The underwater explosion as the main cause of the destruction of the ship structure has become a hot issue studied by scholars all over the world.Because the experimental research on underwater explosion has very demanding requirements and is accompanied by certain dangers,it is extremely important to realize the equivalent loading experiment of non-medical underwater explosion shock wave in the laboratory.Based on the non-explosive underwater explosion load loading device proposed by domestic and foreign scholars,this paper uses the combination of theory,experiment and simulation to study the non-medical underwater shock wave loading technology and its propagation characteristics.The main research contents are as follows:1.The purpose of the equivalent loading method of non-explosive underwater explosion shock wave is to generate shock wave in the form of underwater explosion of explosive.This paper elaborates on the basic theoretical research of underwater explosion shock wave,and introduces the equivalent loading principle of non-explosive underwater explosion shock wave load.2.A gas cylinder loading system was used to establish a column-type water tank equivalent underwater explosion shock wave loading device.For the non-explosive shock wave loading technology,the key points of the loading technology in the experiment were proposed.The effect of the thickness of aluminum alloy flyer on the equivalent shock wave characteristics of non-explosive underwater explosion was studied.The loading process in the experiment was introduced in detail.The finite element software AUTODYN is used to simulate and analyze the experimental process.The results of the experiment are compared with the simulated data.The results are in good agreement.The feasibility of using the explosive shock wave loading device for equivalent experiments and the reliability of the finite element simulation analysis method are illustrated.3.The finite element software AUTODYN is used to analyze the underwater shock wave characteristics in the equivalent tank loading device,and the influence of the thickness of the flyer,the incident velocity of the flyer and the thickness of the piston on the peak value of the shock wave and the time decay constant are determined.The influence of the wave impedance value of the flyer and piston material on the shock wave characteristics is analyzed.4.The extended water tank is used to expand the water area and the equivalent shock wave propagation characteristics generated in the device are studied by the method of comparing the multi-observation point comparison analysis to determine the thickness of the flyer,the incident velocity of the flyer and the thickness of the piston in the water tank.The magnitude of the peak of the shock wave at the point and the influence of its propagation law.The content studied in this paper provides a reference for the research of non-explosive shock wave loading technology and underwater explosion shock wave propagation characteristics.