两种数值算法在球形弹丸侵彻复合靶中的应用  

Application of two numerical methods in penetration of layered plate impacted by spherical projectile

作　　者：周楠[1] 王金相[1] 谢君[1] 彭楚才[1] 

机构地区：[1]南京理工大学瞬态物理国家重点实验室,江苏南京210094

出　　处：《南京理工大学学报》2014年第2期210-215,221,共7页Journal of Nanjing University of Science and Technology

基　　金：国家自然科学基金(11272158);中国博士后基金(2011M500929);部委技术基础科研项目(C1820130005);江苏省普通高校研究生科研创新计划资助项目(CXLX11_0230)

摘　　要：分别采用有限元法(FEM)和有限元同光滑粒子耦合(FE/SPH)算法对球形弹丸侵彻复合靶板过程进行数值研究。采用14.5 mm滑膛枪发射直径6 mm的钢质球形弹丸侵彻不同组合的钢/铝爆炸复合靶,通过弹道实验对数值算法的有效性进行验证。讨论了2种数值算法描述实验现象和结果的适用性,分析了靶板的破坏模式、层数、面密度和组合方式对靶板弹道性能的影响。结果表明:FEM算法较FE/SPH耦合算法能更直观地再现靶板层间结合界面的拉伸破坏形貌,且对实验结果的定量描述比FE/SPH耦合算法更接近实验结果,Tie-Break模型能够有效地反映靶板层间结合强度的影响;在球形弹丸的侵彻作用下,面板和夹板发生剪切冲塞破坏,铝背板发生延性扩孔破坏,钢背板发生瓣状破坏;在面密度相同的情况下,钢/铝/钢3层靶板具有最佳的抗侵彻性能。The finite element method（ FEM） and the coupling algorithm of finite element and smoothed particle hydrodynamics（ FE / SPH） method are applied to simulate the penetration process of spherical projectile into layered plates,and the ballistic experiment is carried out to verify the effectiveness of numerical simulation. In experiment,a 14. 5 mm slip chamber gun is used to launch the spherical steel projectile with 6 mm diameter to penetrate the various steel-aluminum explosive welding plates vertically. The feasibility of the numerical simulations in describing the results of experiment is discussed,and the effects of layer numbers,areal densities and layer combinations on theballistic performance and the damage model are analyzed. The results show that,compared with the FE / SPH coupling algorithm,the FEM can not only reappear the tensile fracture morphology of layers more clearly,but have the better accordance with experiment for quantitative analysis. The Tie-Break model can reflect the influence of interface bonding strength well. The damage model of the front plate and the middle plate is shearing and plugging,the steel rear plate is petalling deformation and the aluminum rear plate is ductile deformation impacted by spherical projectiles vertically. The antipenetration performance of steel-aluminum-steel three-layer plates is the best when the areal density is the same.

关 键 词：冲击动力学 爆炸复合靶 有限元同光滑粒子耦合算法 弹道性能 破坏模式 

分 类 号：O385[理学—流体力学]