一维应力动态加载下战斗部装药力学响应预报模型
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摘要
为获得战斗部装药在高过载侵彻下的动力学行为,对战斗部装药(黑索今(RDX)基高聚物粘结炸药(PBX))在高应变率下的动态力学响应特性进行了研究。采用改进的分离式霍普金森压杆(SHPB)实验技术对RDX基PBX炸药动态力学性能展开研究、压电传感器监测试件两端应力状态、高速相机拍摄实验中的试件变形过程,确保实验试件变形在动态应力平衡和常应变率加载条件下进行,保证实验数据的有效性。结果表明,该RDX基PBX炸药具有明显的密度效应及应变率效应,当应变超越0. 075时应变率效应显著增强。基于应变能函数,建立该RDX基PBX炸药在一维应力状态下修正的Rivilin本构模型,模型拟合结果与实验结果基本相符,仿真结果得到的应变时间信号及试件变形模式与实验结果基本吻合。
The dynamic mechanical response characteristics of warhead charge( RDX-based polymerbonded explosive( PBX)) at high strain rate are studied to obtain the dynamic behavior of warhead charge during high overload penetration. The dynamic mechanical properties of RDX-based PBX explosive are studied by improved SHPB experimental technology. The stress states at both ends of a specimen are monitored using the piezoelectric sensors. The deformation process of the specimen in the experiment is photographed using a high-speed camera. It is ensured that the experimental specimen is deformed under the conditions of dynamic stress balance and constant strain rate loading,and the experimental data are effective. The results show that the RDX-based PBX explosive has obvious density effect and strain rate effect. As the strain exceeds 0. 075,the strain rate effect increases significantly. Based on the strain energy function,a modified Rivilin constitutive model of RDX-based PBX explosive under one-dimensional stress state is established. The fitting results of the model are basically in agreement with the experimental results. The strain time signals and the deformation modes of the specimen obtained from the simulation results are basically in agreement with the experimental results.
The dynamic mechanical response characteristics of warhead charge( RDX-based polymerbonded explosive( PBX)) at high strain rate are studied to obtain the dynamic behavior of warhead charge during high overload penetration. The dynamic mechanical properties of RDX-based PBX explosive are studied by improved SHPB experimental technology. The stress states at both ends of a specimen are monitored using the piezoelectric sensors. The deformation process of the specimen in the experiment is photographed using a high-speed camera. It is ensured that the experimental specimen is deformed under the conditions of dynamic stress balance and constant strain rate loading,and the experimental data are effective. The results show that the RDX-based PBX explosive has obvious density effect and strain rate effect. As the strain exceeds 0. 075,the strain rate effect increases significantly. Based on the strain energy function,a modified Rivilin constitutive model of RDX-based PBX explosive under one-dimensional stress state is established. The fitting results of the model are basically in agreement with the experimental results. The strain time signals and the deformation modes of the specimen obtained from the simulation results are basically in agreement with the experimental results.
引文
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[15]杨震琦.层状复合结构动态力学行为及应力波传播特性研究[D].哈尔滨:哈尔滨工业大学,2010:75-78.YANG Z Q.Research on dynamic mechanical properties and stress wave propagation characteristics of layered composite structures[D].Harbin:Harbin Institute of Technology,2010:75-78.(in Chinese)
[2]BORONSKI D,KOTYK M,MACKOWIAK P,et al.Mechanical properties of explosively welded AA2519-AA1050-Ti6Al4V layered material at ambient and cryogenic conditions[J].Materials&Design,2017,133(5):390-403.
[3]GUO M L,MA Z L,HE L,et al.Effect of varied proportion of GAP-ETPE/NC as binder on thermal decomposition behaviors,stability and mechanical properties of nitramine propellants[J].Journal of Thermal Analysis and Calorimetry,2017,130(2):909-918.
[4]HANG G Y,YU W L,WANG T,et al.Comparative studies on structures,mechanical properties,sensitivity,stabilities and detonation performance of CL-20/TNT cocrystal and composite explosives by molecular dynamics simulation[J].Journal of Molecular Modeling,2017,23(10):281-290.
[5]BAKER W A,UNTAROIU C D,CRAWFORD D M,et al.Mechanical characterization and finite element implementation of the soft materials used in a novel anthropometric test device for simulating underbody blast loading[J].Journal of the Mechanical Behavior of Biomedical Materials,2017,74(10):358-364.
[6]HUSSEIN A K,ELBEIH A,ZEMAN S.Thermal decomposition kinetics and explosive properties of a mixture based on cis-1,3,4,6-tetranitrooctahydroimidazo-[4,5-d]imidazole and 3-nitro-1,2,4-triazol-5-one(BCHMX/NTO)[J].Thermochimica Acta,2017,655(9):292-301.
[7]ABID M,HOU X M,ZHENG W Z,et al.High temperature and residual properties of reactive powder concrete-a review[J].Construction and Building Materials,2017,147(8):339-351.
[8]GARGANO A,PINGKARAWAT K,BLACKLOCK M,et al.Comparative assessment of the explosive blast performance of carbon and glass fibre-polymer composites used in naval ship structures[J].Composite Structures,2017,171(7):306-316.
[9]成丽蓉,施惠基.PBX炸药含裂纹扩展损伤的粘塑性本构关系[J].含能材料,2015,23(10):999-1003.CHENG L R,SHI H J.Elastic-viscoplastic constitutive coupled micro-cracks propagation damage of PBX[J].Chinese Journal of Energetic Material,2015,23(10):999-1003.(in Chinese)
[10]蔡进涛,肖松,王桂吉,等.HTPB在高应变率斜波加载下的动力学响应[J].含能材料,2017,25(9):750-755.CAI J T,XIAO S,WANG G J,et al.Dynamic response of HTPBunder ramp loading with high strain rates[J].Chinese Journal of Energetic Material,2017,25(9):750-755.(in Chinese)
[11]王哲君,强洪夫,王广,等.固体推进剂力学性能和本构模型的力学进展[J].含能材料,2016,24(4):403-416.WANG Z J,QIANG H F,WANG G,et al.Review on the mechanical properties and constitutive models of solid propellants[J].Chinese Journal of Energetic Material,2016,24(4):403-416.(in Chinese)
[12]GROUDREAN G.Evaluation of mechanical properties of PBXW-113 explosive:UCID-20358[R].Livermore,CA,US:Lawrence Livermore National Laboratory,1985.
[13]BLUMENTHAL W R,THOMPSON D G,CADY C D,et al.Compressive properties of PBXN-110 and its HTPB-based binder as a function of temperature and strain rate[C]∥Proceedings of the 12th International Detonation Symposium.San Diego,CA,US:UNT Libraries Government Documents Department,2002:300-310.
[14]傅华,李俊玲,谭多望.PBX炸药本构关系的实验研究[J].爆炸与冲击,2012,32(3):231-236.FU H,LI J L,TAN D W.Experimental study on constitutive relations for plastic-bonded explosives[J].Explosion and Shock Waves,2012,32(3):231-236.(in Chinese)
[15]杨震琦.层状复合结构动态力学行为及应力波传播特性研究[D].哈尔滨:哈尔滨工业大学,2010:75-78.YANG Z Q.Research on dynamic mechanical properties and stress wave propagation characteristics of layered composite structures[D].Harbin:Harbin Institute of Technology,2010:75-78.(in Chinese)