DNAN基含铝炸药低应变率下J-C本构关系  

J-C Constitutive Relation at Low Strain Rates for DNAN-Based Aluminium Explosives

作　　者：康松逸 许杰 卢熹 王树山[1] 贾曦雨 KANG Songyi;XU Jie;LU Xi;WANG Shushan;JIA Xiyu(State Key Laboratory of Explosion Science and Safety Protection,Beijing Institute of Technology,Beijing 100081,China;College of Equipment Engineering,Shenyang Ligong University,Shenyang 110159,China)

机构地区：[1]北京理工大学爆炸科学与安全防护全国重点实验室,北京100081 [2]沈阳理工大学装备工程学院,辽宁沈阳110159

出　　处：《水下无人系统学报》2024年第5期923-930,共8页Journal of Unmanned Undersea Systems

摘　　要：炸药装药的跌落响应问题是典型的低速撞击点火问题,表现出应变率低、脉宽长及脉冲小等特点,与高速冲击点火明显不同。为研究典型水中兵器战斗部装药跌落条件下的动态力学特征,利用分离式霍普金森压杆对二硝基苯甲醚(DNAN)基含铝炸药进行动态压缩试验,通过入射波整形技术实现了常应变率加载,得到了常温常压条件下80、180、280、360和440 s^(-1)等5种低应变率下DNAN基含铝炸药的应力应变曲线,采用Johnson-Cook(J-C)本构模型对试验数据进行了参数拟合,并结合数值仿真加以验证。结果表明:DNAN基含铝炸药的弹性模量、屈服强度、屈服应变、失效应力及失效应变均随应变率的提高而增大。利用拟合得到的J-C本构参数可以在数值仿真中很好地还原DNAN基含铝炸药在低应变率下的动态力学行为,从而为相关跌落安全性数值仿真计算提供数据支撑。The drop response problem of the explosive charge is a typical low-velocity impact ignition problem,whichexhibits the characteristics of low strain rate,long pulse width,and small pulse,and it is significantly different from the high-velocity impact ignition.In order to study the dynamic mechanical characteristics of a typical underwater weapon warheadcharge drop conditions,the dynamic compression test of DNAN-based aluminum explosives was carried out by using the splitHopkinson pressure bar(SHPB),and the normal strain rate loading was achieved by the incident wave shaping technique.Thestress-strain curves of DNAN-based aluminum explosives at five low strain rates,80,180,28,360,and 440 s^(−1) were obtainedunder the conditions of normal temperature and normal pressure.The Johnson-Cook(J-C)constitutive model was used to fitthe parameters of the test data and verified by numerical simulation.The results show that the elastic modulus,yield strength,yield strain,failure stress,and failure strain of DNAN-based aluminum explosives all increase with the increase in strain rate;using the fitted J-C constitutive parameters can well restore the dynamic mechanical behaviors of DNAN-based aluminumexplosives at low strain rate in numerical simulation,and it can provide strong data support for the related numericalsimulation calculation of the drop safety.

关 键 词：水中兵器 战斗部 DNAN基含铝炸药 分离式霍普金森压杆 动态力学性能 J-C本构模型 

分 类 号：TJ630[兵器科学与技术—武器系统与运用工程] TJ454