Aircraft Experiment And Numerical Simulation Of The Typical Structure Of Simulated Battle Damage,

In the combat action, the fighter plane often suffers the unavoidable structure damage, and even leads to fighting performance losing. The most damages are due to the impact of the debris or bullets. In the recent years, with the new design theory, the high survival design concept has been introduced into the aircraft design. At the same time, to achieve real time and quick repair for the damage of the aircraft, aircraft battle damage assessment and repair (ABDAR) program are being constructed. In the wartime, it is obviously important to make quick repair to recover the fighting performance. So it has the practical significance to construct the battle damage evaluation theory and technique for the air force.To investigate the damage behavior of a typical aircraft skin to a general projectile impact, four kinds of LY12-cz plates with thickness 3mm and reinforced aircraft skins are shoot by the projectile impact. In the present paper, a Test-Simulation method was adopted to investigate the damage modes of these skins to a projectile impact with 12.7mm diameter.During testing process, an effective testing system of simulating battle damage has been developed. It consists of high pressed air-gun, an assembled projectile body and bullet-shoe design, an instantaneous velocity measurement system with laser and lens, set-up frame for the specimens, and the projectile trap box. First, LY12-cz plate with thickness 3mm are fixed around, and shoot by the projectile under the velocities varied from 60 to 300m/s. Second, reinforced aircraft skins are tested by the same process as LY12-CZ plates, the relations of the bullet velocity and plate damage size, the bullet velocity and the plate strain, the bullet velocity and the bullet residual velocity are developed. Also the dynamic mechanical capability test of the cover material LY12-cz is carried and the test result is used in the numerical simulation. The numerical simulations are performed according to the test, and the results are compared with the testing results. It shows that, the simulation technique developed in the present paper is effective to simulate battle damage of the aircraft.