基于霍普金森压杆的RDX基含铝炸药装药双脉冲加载实验
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摘要
基于分离式霍普金森压杆实验装置,采用夹心弹结构对周向约束条件下某RDX基含铝炸药装药进行了双脉冲加载,获得了炸药装药的动态力学参数,结合电镜扫描(SEM)图像探讨了双脉冲加载时的微观损伤模式。结果表明,试样的轴向应力-应变曲线出现两次加载峰,第二次加载时的应变率较第一次低,但应力峰值较第一次大,在实验加载应变率范围内(1 000~1 500s~(-1)),两次峰值均随应变率增加而增大;第一次加载应变率较低时(1 000s~(-1)),装药损伤模式基本为晶体裂纹及晶体与黏结剂的脱粘;随着应变率的增加,晶体裂纹扩展成裂缝,并出现小范围的晶体破碎;应变率超过1 200s~(-1)后,在破碎的晶体附近出现大范围的细小晶体,同时伴有黏结剂断裂,此类无包覆的晶体相互作用,使感度提高。
Based on the experimental device of split Hopkinson pressure bar(SHPB),the double-pulse loading of a RDXbased aluminized explosive charge was performed under the circumferential constraint condition using sandwich projectile structure.The dynamic mechanical parameters of the explosive charge were obtained.Combined with scanning electron microscope(SEM)images,the micro-damage modes of double-pulse loading were discussed.The results show that the axial stress-srain curve of specimen has two load peaks.The strain rate of the second loading is lower than that of the first time,but the stress peak is larger than that of the first time.In the experimental strain rate range(1 000-1 500 s~(-1)),the two peaks increase with the increase of strain rate.The damage modes of charge basically is crystal crack and debonding of crystal and binder when the first loading strain rate is lower(1 000 s~(-1)).With the increase of strain rate,the crystal cracks expand into cracks,occurring crystal breakage in the small range.After the strain rate exceeds 1 200 s~(-1),a large range of fine crytals appear near the broken crytal,at the same time,accompanied by the fracture of the binder and such uncoated crystal interact with each other,making the sensitivity improve.
Based on the experimental device of split Hopkinson pressure bar(SHPB),the double-pulse loading of a RDXbased aluminized explosive charge was performed under the circumferential constraint condition using sandwich projectile structure.The dynamic mechanical parameters of the explosive charge were obtained.Combined with scanning electron microscope(SEM)images,the micro-damage modes of double-pulse loading were discussed.The results show that the axial stress-srain curve of specimen has two load peaks.The strain rate of the second loading is lower than that of the first time,but the stress peak is larger than that of the first time.In the experimental strain rate range(1 000-1 500 s~(-1)),the two peaks increase with the increase of strain rate.The damage modes of charge basically is crystal crack and debonding of crystal and binder when the first loading strain rate is lower(1 000 s~(-1)).With the increase of strain rate,the crystal cracks expand into cracks,occurring crystal breakage in the small range.After the strain rate exceeds 1 200 s~(-1),a large range of fine crytals appear near the broken crytal,at the same time,accompanied by the fracture of the binder and such uncoated crystal interact with each other,making the sensitivity improve.
引文
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[4]Luo H Y,Chen W N W,Rajendran A M.Dynamic compressive response of damaged and interlocked SiCN ceramics[J].Journal of the American Ceramic Society,2006,89(1):266-273.
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[8]屈可朋,沈飞,王世英,等.RDX基PBX炸药在不同盈利率下的撞击安全性[J].火炸药学报,2014,37(6):40-43.QU Ke-peng,SHEN Fei,WANG Shi-ying,et al.Research on impact safety of a RDX-based PBX explosive at different stress rate[J].Chinese Journal of Explosives&Propellants(Huozhayao Xuebao),2014,37(6):40-43.
[9]任晓宁,邵颖慧,刘子如,等.硼金属化RDX基炸药的热行为[J].火炸药学报,2014,37(6):40-43.2012,35(3):47-51.REN Xiao-ning,SHAO Ying-hui,LIU Zi-ru,et al.Thermal behavior of boron metallized RDX-based explosives[J].Chinese Journal of Explosives&Propellants(Huozhayao Xuebao),2012,35(3):47-51.
[10]屈可朋,沈飞,肖玮,等.RDX基PBX炸药在被动围压下的力学性能[J].火炸药学报,2014,37(2):57-60.QU Ke-peng,SHEN Fei,XIAO Wei,et al.Mechanical properties of RDX-based PBX explosive under passive confined pressure[J].Chinese Journal of Explosives&Propellants(Huozhayao Xuebao),2014,37(2):57-60.
[11]屈可朋,肖玮,韩天一,等.RDX基PBX炸药的力学行为和损伤模式[J].火炸药学报,2012,35(5):38-40.QU Ke-peng,XIAO Wei,HAN Tian-yi,et al.Mechanical behavior and damage mode of RDX-based PBX explosive[J].Chinese Journal of Explosives&Propellants(Huozhayao Xuebao),2012,35(5):38-40.
[12]冯晓军,王晓峰,徐洪涛,等.Al粉对炸药爆炸加速能力的影响[J].火炸药学报,2014,37(5):25-27.FENG Xiao-jun,WANG Xiao-feng,XU Hong-tao,et al.Influence of Al powder on the explosion acceleration ability for explosives[J].Chinese Journal of Explosives&Propellants(Huozhayao Xuebao),2014,37(5):25-27.
[13]裴红波,焦清介,覃剑峰.基于圆筒实验的RDX/Al炸药反应进程[J].爆炸与冲击,2014,34(5):636-640.PEI Hong-bo,JIAO Qing-jie,QIN Jian-feng.Reaction process of aluminized RDX-based explosives based on cylinder test[J].Explosion and Shock Waves,2014,34(5):636-640.
[14]索涛,邓琼,苗应刚,等.基于Hopkinson压杆实验技术的含能材料动态力学性能测试方法研究进展[J].火炸药学报,2010,33(2):5-9.SUO Tao,DENG Qiong,MIAO Ying-gang,et al.Progress in experimental determination of dynamic mechanical behaviors of energetic materials based on split Hopkinson pressure bar[J].Chinese Journal of Explosives&Propellants(Huozhayao Xuebao),2010,33(2):5-9.
[15]Parry D J,Dixon P R,Hodson S,et al.Stress equilibrium effects within Hopkinson bar experiments[J].Journal de Physique IV,1994,C8:107-112.
[16]Subhash G,Ravichandran G.Split-Hopkinson pressure bar testing of ceramics[J].Mechanical Testing and Evaluation,2000,8(2):497-504.
[17]ZHOU Feng-hua,WANG Li-li,HU Shi-sheng.On the effect of stress nonuniformness in polymer specimen of SHPB tests[J].Journal of Experiment Mechanics,1992,7(1):23-19.
[18]Ravichandran G,Subhash G.Critical apprasisal of limiting strain rates for compression testing of ceramics in a split Hopkinson bar[J].Journal of American Ceramic Society,1994(77):263-267.
[2]Kolshy H.An investigation of the mechanical properties of materials at very high rates of loading[J].Proceeding of the Royal Society A-mathematical Physical and Engineering Sciences.London:Royal Society of London,1949,B62:676-700.
[3]Lindholm U S.Some experiments with the split Hopkinson pressure bar[J].Journal of the Mechanicals and Physics of Solids,1964,12(5):317-335.
[4]Luo H Y,Chen W N W,Rajendran A M.Dynamic compressive response of damaged and interlocked SiCN ceramics[J].Journal of the American Ceramic Society,2006,89(1):266-273.
[5]Xia K,Chen R,Huang S,et al.Controlled multipulse loading with a stuffed striker in calssical split Hopkinson pressure bar testing[J].Review of Scientific Instruments,2008,79:053906.
[6]肖玮,李亮亮,屈可朋,等.某RDX基含Al炸药发射安全性[J].含能材料,2015,23(1):62-66.XIAO Wei,LI Liang-liang,QU Ke-peng,et al.Launch safety of RDX-based aluminized explosive[J].Chinese Journal of Energetic Materials,2015,23(1):62-66.
[7]贾林,张林军,张冬梅,等.低热应力下石蜡对压装RDX基PBX炸药性能的影响[J].火炸药学报,2015,38(5):74-78.JIA Lin,ZHANG Lin-jun,ZHANG Dong-mei,et al.Effect of paraffin on properties of a pressed RDX-based PBX explosive under the low thermal stress[J].Chinese Journal of Explosives&Propellants(Huozhayao Xuebao),2015,38(5):74-78.
[8]屈可朋,沈飞,王世英,等.RDX基PBX炸药在不同盈利率下的撞击安全性[J].火炸药学报,2014,37(6):40-43.QU Ke-peng,SHEN Fei,WANG Shi-ying,et al.Research on impact safety of a RDX-based PBX explosive at different stress rate[J].Chinese Journal of Explosives&Propellants(Huozhayao Xuebao),2014,37(6):40-43.
[9]任晓宁,邵颖慧,刘子如,等.硼金属化RDX基炸药的热行为[J].火炸药学报,2014,37(6):40-43.2012,35(3):47-51.REN Xiao-ning,SHAO Ying-hui,LIU Zi-ru,et al.Thermal behavior of boron metallized RDX-based explosives[J].Chinese Journal of Explosives&Propellants(Huozhayao Xuebao),2012,35(3):47-51.
[10]屈可朋,沈飞,肖玮,等.RDX基PBX炸药在被动围压下的力学性能[J].火炸药学报,2014,37(2):57-60.QU Ke-peng,SHEN Fei,XIAO Wei,et al.Mechanical properties of RDX-based PBX explosive under passive confined pressure[J].Chinese Journal of Explosives&Propellants(Huozhayao Xuebao),2014,37(2):57-60.
[11]屈可朋,肖玮,韩天一,等.RDX基PBX炸药的力学行为和损伤模式[J].火炸药学报,2012,35(5):38-40.QU Ke-peng,XIAO Wei,HAN Tian-yi,et al.Mechanical behavior and damage mode of RDX-based PBX explosive[J].Chinese Journal of Explosives&Propellants(Huozhayao Xuebao),2012,35(5):38-40.
[12]冯晓军,王晓峰,徐洪涛,等.Al粉对炸药爆炸加速能力的影响[J].火炸药学报,2014,37(5):25-27.FENG Xiao-jun,WANG Xiao-feng,XU Hong-tao,et al.Influence of Al powder on the explosion acceleration ability for explosives[J].Chinese Journal of Explosives&Propellants(Huozhayao Xuebao),2014,37(5):25-27.
[13]裴红波,焦清介,覃剑峰.基于圆筒实验的RDX/Al炸药反应进程[J].爆炸与冲击,2014,34(5):636-640.PEI Hong-bo,JIAO Qing-jie,QIN Jian-feng.Reaction process of aluminized RDX-based explosives based on cylinder test[J].Explosion and Shock Waves,2014,34(5):636-640.
[14]索涛,邓琼,苗应刚,等.基于Hopkinson压杆实验技术的含能材料动态力学性能测试方法研究进展[J].火炸药学报,2010,33(2):5-9.SUO Tao,DENG Qiong,MIAO Ying-gang,et al.Progress in experimental determination of dynamic mechanical behaviors of energetic materials based on split Hopkinson pressure bar[J].Chinese Journal of Explosives&Propellants(Huozhayao Xuebao),2010,33(2):5-9.
[15]Parry D J,Dixon P R,Hodson S,et al.Stress equilibrium effects within Hopkinson bar experiments[J].Journal de Physique IV,1994,C8:107-112.
[16]Subhash G,Ravichandran G.Split-Hopkinson pressure bar testing of ceramics[J].Mechanical Testing and Evaluation,2000,8(2):497-504.
[17]ZHOU Feng-hua,WANG Li-li,HU Shi-sheng.On the effect of stress nonuniformness in polymer specimen of SHPB tests[J].Journal of Experiment Mechanics,1992,7(1):23-19.
[18]Ravichandran G,Subhash G.Critical apprasisal of limiting strain rates for compression testing of ceramics in a split Hopkinson bar[J].Journal of American Ceramic Society,1994(77):263-267.