Research On Impact Dynamic Behavior Of Fluid-solid Interface

In recent years,with the strengthening of the economic and military strength of various countries,the utilization and exploitation of marine and marine resources have been stepped up.Under this trend,all countries have increased the construction of naval forces.Underwater explosion is the main threat to ships.It is of great importance to study the underwater explosion shock wave for ship protection.The propagation of shock waves at the fluid-solid interface is an important part of this study.The impact dynamic behavior at the fluid-solid interface is particularly important.At present,with the rapid development of computer technology,great progress has been made in numerical simulation of underwater explosion shock wave.At the same time,the experimental research of underwater explosion shock wave has also made a big breakthrough,which has been transformed from the traditional underwater explosives blast shock wave experiment into non-drug equivalent explosion blast wave experimental device research.The non-drug equivalent not only can greatly reducing the experimental cost,but also with high repeatability and maneuverability.Based on the research on the equivalent loading device of underwater explosion shock wave,a new kind of underwater explosion shock wave equivalent loading device is proposed in this paper,and several parts of this device were researched:1.Based on the basic theories of one-dimensional elastic stress wave and impact dynamics,a simple theoretical model is established for the proposed device,and the fluid-solid interface attenuation coefficient k is proposed.2.The ANSYS/LS-DYNA finite element software ALE algorithm is used to establish the numerical model for the proposed device.The influence of variable factors on the waveform of the equivalent underwater explosion shock wave is discussed.At the same time,the numerical simulation results show that the attenuation the range of coefficient k.3.The new underwater explosion shock wave equivalent loading device proposed in this paper has been studied through experiment,the source of experimental errors have been analyzed in detail,and the experimental results are compared with the simulation results to prove the accuracy of the experimental values,at the same time verify the feasibility of usingsimulation method in this paper.4.The SHPB generated underwater shock wave device is simulated and researched.Considering the influence of piston taper angle,thickness and expansion channel angle,which provides a guideline for the future design of large-size devices.Finally,the advantages and disadvantages of the underwater explosion shock wave equivalent loading device and the existing underwater explosion shock wave equivalent loading device are compared.