Study On The Ballistic Characteristics Of The Projectile Penetrating Into The Multi-span Concrete Target

Building is one of the main targets that was penetrated by projectile in the war,when projectile penetrate,because of the distance of near two targets of this kind targets is large,and the time during penetration is long,which may cause big deflection of projectile.Both here and abroad,the number of published references about researches of projectiles penetrate multi-layer concrete targets was small.therefore,on the basis of numerical simulation method and experimental research,the thesis studies the influence of difference factors on the laws of ballistic character when projectile penetrating single-layer and three-layer concrete targets.The main research contents of this thesis are as follow:1.Introduced part of mathematical formulas of projectile oblique perforation finite thick concrete targets.The results from experimental and calculation are compared.It verifies the reliability of the formulas.2.The HJC concrete constitutive model and the way to chose its parameters are introduced,the reliability of the finite element model is proved by comparing the simulation results from LS-DYNA with calculation results.Base on the models of projectile and targets,simulate the process of projectile perforation single-layer concrete target with different initial velocity,ratio of length to diameter,labyrinth ration,centroid position and target thickness.The trajectory characters of projectile during the perforation process was analyzed.3.The laws of result velocity,deflection angle of projectile,attack angle and decelerati-on of projectile oblique perforation three-layer concrete targets with different factors(initial velocity,oblique angle,attack angel,ratio of length to diameter,labyrinth ration,centroid position)were analyzed by LS-DYNA.4.The experiments to study the laws during the process of projectile penetrate three-layer concrete targets are done.By comparing with the results of numerical simulation,those results are in good agreements.It got some correlation laws of rigid projectile penetration three-layer concrete targets through the research of the dissertation.The conclusions can be used to guide the design of the warhead.