Analysis Of Overload Problem In The Process Of Penetration Of The Projectile

Studying on projectile penetration problem has an important guiding significancefor projectile design, it is helpful to understand the penetration characteristics, and betterfor the national defense service. This paper mainly studies the penetration of egg-shapedprojectile made of4340Steel in different speed and the different ratios of warheadscurvature radius and diameter to concrete of different compressive strength, gainingpenetration principle of penetration depth and overload acceleration. We study andverify from two aspects of theoretical analysis and numerical simulation. The theoreticalanalysis uses Forrestal formula and numerical simulation uses the nonlinear software ofimpact dynamics—LS-DYNA to simulate different conditions.Firstly through the theoretical analysis, we get ovoid projectile （CRH=3）penetration situation at the speed of400-1200m/s, knowing that in the lower speedpenetration depth increases with the penetration velocity increasing and accelerationincreases with the increase of speed. Verify the penetration of different CRH anddifferent concrete targets finding that CRH is larger, that is the bullet shape morepointed, projectile penetration depth is larger, acceleration shorter and concrete targetstrength is more obvious on projectile penetration that target strength is greater andpenetration depth is relatively smaller with the acceleration changing larger.For the penetration problems with different situations, we firstly simulate thesimulation of different speed, obtaining the simulation curve of penetration depth of thetime-history and acceleration of projectile. Compared with experimental results,proving the reliability of numerical simulation. Then simulating the penetrationcondition of different CRH projectile, different target materials and different ratio oflength to diameter, the simulation results show that: the warhead more pointed, targethinders smaller on projectile penetration; target strength is greater, the greater theobstacles is; in a certain range, the ratio of length to diameter is larger, the smaller targetblock is on the penetration.