深侵彻弹弹体结构稳定性研究

【作者】 代廷静；

【导师】 沈培辉；

【作者基本信息】 南京理工大学 ， 火炮、自动武器与弹药工程， 2012， 硕士

【摘要】 深侵彻弹在垂直侵彻混凝土过程中受到靶的反作用力,导致弹体出现轴向压缩、横截面应力集中以及内部装药安定性得不到保障等现象。为了诠释这一基本形象,获取较好的弹体结构,利用弹塑性力学、应力波传播基础、泰勒撞击理论、里希脱理论以及空穴膨胀等基本理论,分析弹体在垂直侵彻过程中弹身部分的轴向压缩量、横截面受力情况；并利用有限元软件AUTODYN-2D,数值模拟不同弹体侵彻半无限混凝土靶的过程。分析得出圆筒结构、加强筋结构(包括柱形加强筋和弧形加强筋)、变截面结构在侵彻过程中轴向压缩量、横截面应力以及内部装药压力随时间的变化曲线,其结果与理论计算基本吻合。将三种结构作对比分析,结果表明：在深侵彻过程中,加强筋结构弹体的轴向压缩量、横截面应力值与加强筋安放的位置有一定关系；与其它几种结构相比变截面结构弹体不仅弹身部分轴向压缩量最小,而且弹体横截面应力值变化也最小,且存在一个最优值；变截面结构内部装药在有缓冲物的前提下最大压力比圆筒结构小。因此,变截面结构能有效保障弹体垂直侵彻过程中结构的稳定性,提高内部装药的安定性。更多还原

【Abstract】 Deep penetration projectile will get reaction force from the target when it penetrates into concrete vertically, which, will lead to such phenomenon as axial compression in projectile body, stress concentration in cross section and lack of internal charge stability. In order to interpret this phenomenon and obtain a better structure.Based on the theory of elastic-plastic mechanics, stress wave propagation, Taylor impact, and cavity expansion, this paper analyses axial compression and the force in the cross section in projectile body. We use finite element analysis software AUTODYN-2D to simulate the processes where different projectile bodies penetrate into semi-infinite concrete target. We get the time curve of analyses axial compression, force in the cross section and internal charge pressure when cylindrical structure, reinforcing rib structure (including cylindrical reinforcing rib and arc stiffener reinforcing rib), and variable cross-section structure are in the process of penetration respectively. The results are almost in accordance with the theoretical calculation.what is more; we make comparative analysis on the three structures. It shows that in process of deep penetration, axial compression and force in the cross section of the reinforcing rib structure are relative to its placed position; compared with other structures, variable cross-section structure has both minimal axial compression and minimal changing value of force in cross section, it exists an optimal value. Maximum pressure in variable cross-section structure will be smaller than that in cylindrical structures on condition that its internal charge is installed with buffer. Therefore, the variable cross-section structure can effectively guarantee stability of the structure and improve the internal charge stability in the process of penetration.更多还原