Research On Armour Piercing Model Of Rod Tungsten Alloy Projectile Impacting Multilayer Steel Target At Hypervelocity

With the application of hypervelocity impact in space protection and military applications,research in the field of hypervelocity impact has become more and more indepth at home and abroad,especially the research on the relevant characteristics of the fragments produced by the projectile body's hypervelocity impact on the thin plate.After the study of the rod-type projectile impacting the single-layer thin plate at hypervelocity,people have focused on the study of multi-layer protective targets.Based on the above background,this article has carried out the research on the armor-piercing model of the rodtype tungsten alloy projectile hitting the multilayer steel target at hypervelocity.In this paper,a two-stage light gas gun was used to carry out the experiment of a rodtype tungsten alloy projectile hitting a single-layer and multi-layer steel target at a speed of1.5?3km/s,and combined with the SPH(mesh-free algorithm)numerical simulation in the AUTODYN software to perforate the target plate.The remaining projectile length,singlelayer and multi-layer fragment group models are studied,and the research results can provide important reference for the ultra-high impact of the rod-type tungsten alloy projectile against the multilayer steel target.The main contents are as follows:1.Summarize the theory,experiment,numerical simulation and debris cloud model,analyze the current research status of hypervelocity impact at home and abroad,and introduce the shock wave theory,the relationship between shock wave velocity and particle velocity,and the theory of projectile fragmentation.2.Introduced the second-level light gas gun experiment,and determined the experimental plan and content.Under the condition that the simulation calculation conditions are the same as the experimental conditions,the material and model parameters are determined by comparing the shape of the fragment group,the remaining length of the projectile,the remaining projectile velocity and the longitudinal expansion speed of the fragments,which proves the rationality of the parameter selection.3.Combined with the hypervelocity impact experiment and ANSYS/AUTODYN numerical simulation,the quantity and quality of the fragments of the projectile were analyzed.Under different impact conditions,the influence of material parameters on the perforation diameter of the target plate under hypervelocity impact of the rod-type tungsten alloy projectile was obtained,and the target perforation prediction model was established and verified.Combined with the hypervelocity impact experiment,the length data of the remaining projectile after the projectile penetrates the first target plate under different impact conditions are obtained,and the calculation model is obtained and verified by fitting.Then,according to the conservation of mass,kinetic energy and energy,combined with the formula of the diameter of the perforation and the formula of the remaining projectile length,the model of the fragment group of ultra-high-velocity impact single-layer target was deduced and verified.4.Based on the length erosion mechanism of the projectile and the law of velocity loss of the projectile,a rapid prediction model of the multi-layer armor penetration ability of hypervelocity impact was established,and the damage law of the multi-layer target was analyzed,and on this basis,the multilayer tearing was derived Perforation damage model.On the basis of the first-layer armor piercing model,according to the penetration conditions of the projectile body and the target fragments,a multi-layer fragment group model is derived and verified.The model describes the characteristic parameters of the fragment group after the multilayer armor piercing.