Numerical Simulation Of Cascade Implosive Magnetic Flux Compression Process

MC-1 technology(MC-1 cylinder implosion magnetic flux compression generator technology)is a dynamic loading technology that converts the high energy density chemical energy generated by explosive detonation into super strong electromagnetic energy.The MC-1 multi-level device based on the principle can generate ultra-high magnetic field and ultra-high pressure,and has the remarkable characteristics of good isentropy,high loading pressure and low temperature rise.At present,it has gradually become an important experimental tool for researching the physics of strong magnetic fields,material synthesis and high-pressure phase transition.As the core component of multi-stage MC-1 device,the mechanical and electromagnetic properties of composite multilayer densely wound solenoid sleeve are very important for the result of the entire implosion compression process,the sleeve size parameters and material selection may also affect the loading effect directly.This paper aims at the special structure of the composite multilayer densely wound solenoid with an appropriate electromagnetic analysis model,and the deformation results of electric solenoid which load as initial disturbance into the implosion process of the LS-DYNA.With the display dynamic analysis method,exploring the dynamic response process and the interface instability development of the composite densely wound solenoid under the condition of implosion impact and electromagnetic.The main contents are as follows:The first chapter mainly introduced the working principle,development process and current research status at home and abroad of the magnetic flux compression device.At the same time,partially investigated the current research methods for dynamic damage mechanical properties of composite materials.In this part,it also analysed and summarised the problems and corresponding methods that the functional composite materials needed to pay attention to in the numerical simulation analysis,clarified the work content and focus of the full text.Chapter 2 introduced the structure of the composite densely wound solenoid and clarified its role in the process of implosion magnetic flux compression,and analysed the manufacturing process of the composite densely wound solenoid sleeve in detail to clarify the process steps that are prone to errors in the production process.Recording errors for that cannot be reduced through process improvement,and performed error analysis during the subsequent numerical simulation.According to the characteristics of the implosion magnetic flux compression process,proposed a two-dimensional model of the high-speed impact solenoid metal-epoxy mixed layer to provide a parameter reference for the dynamic response analysis of the sleeve implosion compression.Chapter 3 analysed the three-dimensional transient magnetic field on the composite densely wound solenoid sleeve with the numerical simulation method to obtain the initial magnetic field value and distribution inside the sleeve under the excitation parameters of the experimental conditions,and extracted the Lorentz force values of the recirculation's spiral and sleeve layer as the initial conditions during the numerical simulation of the explosive implosion compression sleeve.Also,analysing the specific influence of the error in the processing of the sleeve on the experimental results.In chapter four,it explained how to use the LS-DYNA software to establish the finite element model of the composite densely wound solenoid sleeve implosion compression,and realised the dynamic response process analysis of sleeve implosion.Simultaneously,based on the results of Chapters 2 and 3,under the basis of the model loading the electromagnetic force time-history curve,modified some material parameters of the composite material,and respectively analyzed the implosion compression process of the primary and secondary sleeves from the axial and radial directions.Exploring the influence of the series of factors on the final experimental results,such as assembly error of MC-1 device and composite sleeve modeling method.The last chapter 5 summarised the main conclusions of the full text,analysed the characteristics and deficiencies of the research methods,and putting forward to the prospects for the next step.