Mechanics Research On Penetration Of KE-projectile To Ceramic Composite Amour

During the past years a great deal of interest has been devoted to the study of ceramic composite armor due to the application in defense, In the light of recent work of ceramic/composite armor the dissertation provides the defensible performance of ceramic/ metal, ceramic/non-metal light armor and multi-layer ceramic composite armor and its optimization design. At one time, it motives us to study the smash mechanism of ceramic facet plate under the effect of impact load and to analyzed different defensible performance from homogeneous armor. There set up some new models and come up with a series of solution. The major contributions in this dissertation are as fellows.1. Momentum and energy model of small AP normal penetrate through ceramic/ metal light armor is presented. They are applied to different situations and verified by experiments. Analysis model of small AP oblique penetrating ceramic/ metal light armor is established on the basis of energy model and the assumption of ellipse absorbing the same energy in back plate, giving the predictable formula about ballistic limit velocity. With energy model the optimization design in relation to ceramic/ metal light armor is analyzed and the optimal coefficient of ceramic/ metal composite armor is gained.2. The damage mechanism and defensible performance of ceramic/ metal light composite armor are studied. Firstly the damage or destroy mechanism of anisotropic fiber orthogonal composite target under the action of impact load is analyzed. With the material dynamic constitutive equation including damage and the effect of stain rate the predictable formula about ballistic limit velocity of fiber composite target. Secondly based on the damage feature about ceramic/ fiber composite target caused by impact load, analysis model about defense performance of ceramic/ composite material target is formed and the predictable formula about ballistic limit velocity is also given. Lastly using the reflection and projectile theory of stress wave the paper discusses the design of ceramic/ composite material target, optimizes the design of double layer ceramic/composite targets, gains optimal coefficient under certain area density and discusses the variety relationship of area density and thickness with optimal coefficient under some ballistic limit velocity3. For impacting on ceramic plate formation mechanism of smash cone angle is investigated. At first in the condition of low-velocity impact it is discussed with the formation of ceramic smash cone angle on the base of quasi-statistic Hertz and 3 a 6 y A c - theory. Then using spherical stress wave reflection and transmission theory under the state of medium-high velocity the formation of spot in the ceramic back. Finally the damage mechanism of ceramic suffered by the high impact is simply discussed.4. We discuss the multi-layer composite armor penetrated by the rod projectile with the velocity of 1000m/s~3000m/s. Firstly on the basis of twin shear unified strength theory and spherical cavity expand theory it is established the expression about target defense force, given the equations of rod projectile penetrate and impact velocities on ceramic/ composite target under the same pressure and verified through the experiment. Secondly the analysis model of ceramic/ GRFP/ steel composite multi-layer target penetrate depth employing above differential equation of target defense force, penetrate velocity and rod velocity. There are two team of experiments which testify separately the penetrate depthand effect with different length-to-diameter. Finally engineering model is advanced which rod projectile normal penetrate ceramic multi-layer composite target. The V50 expression of target defensible performance is given verified by the experiment. Using the expression and the given restriction optimization design of ceramic/ composite armor is researched.