刚性弹体对素混凝土厚靶侵彻响应的LDPM数值模拟研究  

LDPM numerical analysis of hard projectile penetration in thick plain concrete target response

作　　者：冯君[1,2] 李文彬[2] 徐磊[3] 陈宇[2] 陈曦 FENG Jun;LI Wenbin;XU Lei;CHEN Yu;CHEN Xi(National Key Laboratory of Transient Physics,Nanjing University of Science&Technology,Nanjing 210094,China;School of Mechanical Engineering,Nanjing University of Science&Technology,Nanjing 210094,China;College of Water Conservancy&Hydropower Engineering,Hohai University,Nanjing 210098,China;Department of Artillery Reconnaissance,Nanjing Artillery Academy,Nanjing 211132,China)

机构地区：[1]南京理工大学瞬态物理国家重点实验室,南京210094 [2]南京理工大学机械工程学院,南京210094 [3]河海大学水利水电学院,南京210098 [4]南京炮兵学院侦测系,南京211132

出　　处：《振动与冲击》2018年第8期75-81,共7页Journal of Vibration and Shock

基　　金：江苏省自然科学基金(BK20170824)

摘　　要：基于一种新的细观离散元模型Lattice Discrete Particle Model(LDPM),该研究建立了刚性弹侵彻素混凝土厚靶的数值仿真模型。对LDPM基本假设和细观模型构建简单介绍,结合三轴压缩响应曲线,对23 MPa强度素混凝土进行LDPM参数标定。通过对比弹体减速度和侵彻深度试验值,验证数值模型对于混凝土厚靶侵彻问题的适用性。LDPM模拟弹体恒定速度侵彻混凝土厚靶,获得侵彻行程中侵彻阻力变化曲线,结合Forrestal阻力公式得到靶体静态阻应力。仿真结果表明,尖卵形弹头不同CRH值以及侵彻速度对靶体静态阻应力基本没有影响;弹径为最大骨料直径3倍、6倍和8倍的弹体受到靶体静态阻应力分别为260 MPa、175 MPa和163 MPa。该结果对混凝土侵彻缩比实验研究具有重要的实际工程意义。Based on a mesoscale discrete method titled Lattice Discrete Particle Model(LDPM),this work established a numerical simulation model for plain concrete thick target penetration.A brief introduction of LDPM basic assumptions and mesoscale constitutive laws was presented,which was followed by LDPM parameters calibration according to the hydrostatic compression and triaxial compression tests data.The proposed numerical model was validated for the concrete penetration problem in terms penetration depth and projectile deceleration curves during penetration process.With the calibrated LDPM parameters for 23 MPa strength concrete,this paper derived the penetration resistive force by conducting LDPM deep penetration simulations.Combining the Forrestal equation,the target static resistance was then obtained which indicates that either the CRH nor the penetration velocity hardly affects the target static resistance,meanwhile projectiles with 3 times,6 times and 8 times maximum aggregate size suffer 260 MPa,175 MPa,163 MPa target static resistance.

关 键 词：离散单元 混凝土侵彻 弹头形状 弹径尺寸效应 

分 类 号：O385[理学—流体力学]