| Summary: | 博士 === 國防大學理工學院 === 國防科學研究所 === 101 === Design of the protective structure must consider the threat and performance of itself, that is the so-called problem of attack and defense. Therefore, the analysis of the failure mode and evaluation of the penetration performance, for the projectile high-speed impacting protection structure, always play an important role.
In this research, we took the resistance formula based on spherical cavity expansion theory to investigate the homogeneous and non-homogeneous material structures impacted by high-speed projectiles as well as to establish the analytical models for single-layered and double-layered composite structures, respectively.
The homogeneous model was applied to single-layered, double-layered aluminum alloy plates, and double-layered polymer/metal material composite structures for the performance analysis, i.e., the residual velocity, ballistic limit velocity and penetration depth. The non-homogeneous model was applied to single-layered aluminum foam target and aluminum foam sandwich structure for the penetration depth prediction. The homogeneous model is a simple and effective to the analysis of ballistic performance for the double-layered composite targets consisting of contact and spaced homogeneous materials. Meanwhile, the key parameters of projectile penetrated process, such as instant velocity, resistance force and deceleration at any specified position as well as time history of DOP (Depth of Penetration) were obtained by incremental calculation of penetrated depth. In addition, we used the regression method to introduce the calculation equation of sliding friction coefficient for homogeneous model as well as proposed the correction factor k of penetration depth for non-homogeneous model, respectively. Good agreement was shown between the analytical predictions and experimental results.
The finite element software ANSYS/LS–DYNA was also used to perform a simulated analysis on the penetration performance of variety configuration targets, as well as to establish the numerical model for verification. Besides, the ballistic test experiments were performed for single-layered and double-layered composite structures by using 0.30 inch AP (Armor Piercing) bullets and air gun, respectively. Finally, a comparative analysis was performed based on the theoretical model, experiments, reference data, and numerical simulation results.
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