Abstract: As the penetration capability of the projectile increase, the weight and size of protective structures guided by the traditional "blocking" protective design concept are bound to rise to achieve the defense objectives. The idea of ‘deflection’ protection based on non-ideal projectile penetration and projectile deflection in non-uniform penetration protection structures makes it possible to have lighter and more efficient protection structures. This paper reviews the current status of research on deflected anti-penetration protection technology by focusing on various deflection phenomena in projectile penetration. The main contents include the deflection phenomena in the process of non-ideal penetration of the projectile and the process of penetration of the projectile into the non-homogeneous protective structure, the analysis of the process of non-idealpenetration, and the main factors affecting the degree of deflection in the process of non-ideal penetration of the projectile, the mechanism of deflection of the projectile in the non-homogeneous protective structure, the introduction of the three typical forms of deflected protection structure in the current practical application, and the analysis of their anti-penetration performance and the existence of deficiencies. Finally, the current research status of deflected anti-penetration protection technology is proposed to provide a reference basis and ideas for developing high-performance deflected protection structures.
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