椭圆截面侵彻弹体结构优化设计与结构响应  

Structural optimization design and structural response of elliptical-section penetration projectiles

作　　者：谭远深 黄风雷[1] 皮爱国[1] TAN Yuanshen;HUANG Fenglei;PI Aiguo(State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学爆炸科学与技术国家重点实验室,北京100081

出　　处：《爆炸与冲击》2022年第6期69-82,共14页Explosion and Shock Waves

摘　　要：针对异型截面侵彻弹体的工程应用需求,围绕椭圆截面侵彻弹体结构响应及优化设计问题开展研究。引入无量纲壁厚系数,改进了椭圆截面弹体参数化表达式;以提高短轴惯性矩和静矩、降低短轴方向结构响应为目标,开展了椭圆截面弹体抗弯优化设计。基于152 mm口径轻气炮开展了椭圆截面弹体反弹道侵彻试验研究,获得了软回收试验弹体的弯曲挠度结果;开展了试验工况的数值模拟研究,提取了数值模拟中弹体的变形结果;建立了椭圆截面侵彻弹体弯曲结构响应计算模型,利用此模型对试验弹体变形情况进行了计算。与原椭圆截面弹体相比,优化后截面短轴惯性矩、静矩提高比例约为16%,试验弹体弯曲挠度降低比例约为25.3%,数值模拟及理论模型计算结果与试验结果较为相符,验证了本文优化设计方法的有效性,可为工程设计提供参考。According to the engineering application requirements of special-shaped section penetrating projectiles,the structural response and optimal design of elliptical-section penetration projectiles were studied.From this point of view,an improved general design method of elliptical-section projectiles was developed by introducing a dimensionless cartridge thickness coefficient of the elliptical projectile.In order to improve the inertia moment and static moment to the short axis of the cross-section,a bending optimization design method of the elliptical-section projectile was proposed by reducing the cartridge thickness of the projectile to a certain extent and redistributing the reduced materials.Based on a 152-mm-diameter light gas gun test device,the reverse tests of three kinds of elliptical-section hollow projectiles with the long axis of 1.8 cm and the short axis of 1.2 cm penetrating a 2024-O aluminum target were carried out,and the responses of the projectiles in the penetration process were obtained.The projectiles after tests were collected by the soft recovery method,and the deformation of the central axes of the projectile was obtained by the gray processing method.Numerical simulations of the tests were carried out by LS-DYNA.The stress,strain,and penetration load of the projectiles during the penetration process were obtained,and the equivalence of the normal ballistic test and reverse ballistic test was verified.Based on the free-free beam theory,a bending response calculation model of the elliptical-section projectile was established.Through the optimized design,the inertia moment to the short axis of the elliptical section increases by 16.44%,and the static moment increases by 15.95%.Under the test conditions,the bending deflection of the projectile decreases by 25.25%.The structural response model was used to calculate the projectile deformation under the test conditions.The calculation results of the theoretical model are in good agreement with the test results,which shows that the calculation metho

关 键 词：侵彻 结构响应 椭圆截面弹体 优化设计 反弹道 

分 类 号：O385[理学—流体力学]