内凹六边形负泊松比蜂窝结构弹带挤进过程力学特性OA北大核心CSTPCD

The engraving process of projectile accompanies the mechanical environment of strong impact,high overload,and high temperature.During this process,the homogeneous brass rotating band undergoes plastic deformation and damage destruction under the action of rifling land,resulting in the copper hanging on the inner surface of the barrel.With the widespread use of the concave hexagonal negative Poisson's ratio honeycomb structure(CHNPRHS),a novel CHNPRHS rotating band was proposed for the purpose of reducing the copper hanging phenomenon,taking advantage of the excellent load reduction and impact resistance of the structure.The finite element model of the rotating band engraving into the barrel was established.The deformation mode and mechanical properties of the CHNPRHS rotating band in the condition of positive propellant were studied.The research results show that the CHNPRHS rotating band satisfies the internal ballistic performance requirements during firing.While the movement of the projectile in the process of engraving is not significantly different from that of the traditional homogeneous brass rotating band.Due to the fact that the CHNPRHS rotating band undergoes three deformation stages of the elastic,plateau,and densification.There is slight damage and fracture on the surface of the rotating band,and it adheres well to the inner surface of the barrel.Compared with the conventional rotating band,the damage and energy consumption of the rotating band during engraving can be reduced by 76.9％.The CHNPRHS rotating band can decrease the occurrence of copper hanging on the inner surface of the barrel,and reduce the surface erosion of the barrel to some extent,thereby improving the service life of the barrel.