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.
作者
康松逸
许杰
卢熹
王树山
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)
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
