Adaptive Invasion Depth Of The Projectile Head Structure Design And Numerical Simulation Research

This paper designed a projectile structure which can be adaptive to the predetermined penetration depth. On the basis of theoretical analysis of the penetration of rigid projectile, the initial adaptive projectile structure for predetermined penetration depth is designed according to the related empirical formula and design requirements, the related experiment and numerical simulation research are both finished. Through the contrast, numerical simulation results and experimental data are consistent. On the basis of the initial structure, using numerical simulation methods to optimize the structure of the projectile, then the projectile structure which can meet the predetermined penetration depth requirements for concrete, and on the basis of this structure, the one for the soil is also designed.The primal contents and conclusion in this dissertation are as follows:(1) The rigid projectile penetration theory is analyzed. On the basis of the existing dynamic cavity expansion theory, the projectile penetrating concrete target process is divided into two stages, rigid projectile resistance models for different head shapes are established. Then the oblique penetration movement of the rigid projectile is analyzed.(2) According to the related empirical formula and the design requirements, the initial adaptive projectile structure is designed, and the related experimental research is done, experiments showed that the structure can’t fully meet while penetrating into concrete and soil up to the related penetration depth requirements. On the basis of the experiment, the LS-DYNA is used to do the numerical simulation for the penetration experiments of the initial projectile, the numerical simulation results and experimental data are consistent.(3) For the shortage of the structure in the experiment, the numerical simulation method is used to optimize the initial projectile structure. Eventually three relatively reasonable structures are selected for verification, through the comparative analysis of their penetration effect, the truncated cone projectile can meet the predetermined penetration depth requirements for concrete, on the basis of this truncated cone projectile, a damping plate structure is added for the penetration depth requirements for soil. Finally the related research work is finished.