Numerical Simulation Study On Implosion Compression Of Composite Structural Sleeves

The cylindrical magnetic flux compression by explosive implosion (MC-1) is a kind of unique high energy density dynamic technique. It is the use of explosive driven cylinder conductor quickly to compress the magnetic flux, to accumulate the magnetic flux within the cavity formation super magnetic field and high magnetic pressure at the same time. In order to overcome the limitations of conventional MC-1 technology, Russian academy of experimental physics develop the cascades cylindrical implosion flux compression technology, this technology effectively reduces explosion of conductor liner in the process of compression buckling destruction, and implements the corresponding super ultra-high magnetic field intensity and magnetic pressure. At present domestic the technology is still in its infancy, liner instability is one of the key factors restricting the development of the technology. This article is given priority to with numerical simulation, the experiment research is complementary, composite structure liner for the cascades MC-1 device -Multilayer tightly arrangement solenoid by the AUTODYN program to study the fluid dynamics response of implosion compression.Using the Smooth Particle Hydrodynamics (SPH) solver of AUTODYN program, we simulated the implosive compression process of Multilayer tightly arrangement solenoid and the shape of structure interfacial instability. Using the AUTODYN user-defined subroutines, we establish three dimensional solenoid model and accomplish periodic boundary; liner center area was obtained by mathematical statistical method the standard variance of particle interface, in order to study the law of socket interface perturbation growth within the structure. Our calculated results show that, the displacements of solenoid structure in implosive compression process grow fast and the structure interface becomes instability at the end of compression, which are in agreement with the experimental results of abroad.Using the current design of composite structures carry out the explosive implosion compression experiment of liner device and study its critical compression performance. Experiment used 3kg column type high-energy explosive detonation to load the solenoid liner, by ultrahigh speed simultaneous framing and streak photography record detonating compression socket interface in the process of movement with one-dimensional images. To simulate the implosion compression process of composite structure liner, obtain the solenoid liner movement one-dimensional image record with the experiment results are basically identical.This article make full use of the SPH solver, Analysis the liner structure in the process of implosion compression with different solenoid spiral Angle, wire diameter and join the initial disturbance impact on the development of interfacial instability. Meanwhile we establish the numerical model of cascades MC-1 device, calculate and analysis the implosion compression in the process of dynamic response process of primary liner and secondary liner, research primary socket interface perturbation deformation effects on secondary liner implosion compression performance. Calculation shows that Solenoid structure parameters deeply affect the development of interfacial instability, the smaller the spiral angle, the larger the interfacial instability at the end of compression process; while the smaller the wire diameter, the weaker the interfacial instability at the end of compression process. And join the initial disturbance will make late compression of the structure of the interface isn't stable disturbance deformation more apparent, structural instability is faster. The primary liner disturbance deformation with lager degree will produce non-uniform cylindrical shock wave in the process of impact, which will affect the secondary liner compaction process.