高g值载荷作用下离散颗粒增强复合材料损伤特性研究
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摘要
针对钻地弹攻击地下深层目标过程中,战斗部离散颗粒增强复合材料装药提前起爆现象进行高g值加载条件下的损伤形式研究。基于一级轻气炮,应用激光测速系统测量试件击靶前速度,压电传感器监测试件击靶端面应力状态,在Taylor冲击加载下的损伤特性进行试验,分析冲击载荷压力对离散颗粒增强复合材料宏观损伤特性的影响及其细观损伤模式及机理。结果表明:随冲击载荷压力不断增大,细观损伤模式为晶体颗粒表面与黏结剂间的剪切脱黏、孪晶带、穿晶断裂以及黏结剂劈裂等,细观损伤裂纹的加剧引起宏观裂纹产生,裂纹扩展断裂从而导致试件宏观损伤。晶体颗粒剪切脱黏强度模型和裂纹扩展断裂强度模型计算与试验结果基本吻合,为离散颗粒增强复合材料细观损伤机理研究提供重要参考依据。
In the process of projectiles attacking deep underground targets,the early detonation of discrete particle reinforced composite charge often occurs.In order to solve this problem,the damage form of discrete particle reinforced composite charge was studied under high G loading condition.Based on the first-order light gas gun,the laser velocimetry system was used to measure the velocity of the specimens before hitting the target,and the piezoelectric sensors were used to monitor the stress state.A series of experiments were carried out to study the damage characteristics under Taylor impact loading.The effects of impact loading pressure on the macroscopic damage characteristics were discussed and analyzed.The results show that with the increase of impact pressure,the meso-damage modes of discrete particle reinforced composites are mainly shear debonding between the surface of crystal particles and binder,twin band,transgranular fracture and binder splitting,etc.Macroscopic crack initiation is caused by the increase of mesoscopic damage cracks.The crack propagation and fracture of discrete particle reinforced composites lead to macroscopic damage of specimens.The calculated results of shear debonding strength model and crack propagation fracture strength model of crystal particles are basically in agreement with the experimental results,which provides an important reference for studying the meso damage mechanism of discrete particle reinforced composites.
In the process of projectiles attacking deep underground targets,the early detonation of discrete particle reinforced composite charge often occurs.In order to solve this problem,the damage form of discrete particle reinforced composite charge was studied under high G loading condition.Based on the first-order light gas gun,the laser velocimetry system was used to measure the velocity of the specimens before hitting the target,and the piezoelectric sensors were used to monitor the stress state.A series of experiments were carried out to study the damage characteristics under Taylor impact loading.The effects of impact loading pressure on the macroscopic damage characteristics were discussed and analyzed.The results show that with the increase of impact pressure,the meso-damage modes of discrete particle reinforced composites are mainly shear debonding between the surface of crystal particles and binder,twin band,transgranular fracture and binder splitting,etc.Macroscopic crack initiation is caused by the increase of mesoscopic damage cracks.The crack propagation and fracture of discrete particle reinforced composites lead to macroscopic damage of specimens.The calculated results of shear debonding strength model and crack propagation fracture strength model of crystal particles are basically in agreement with the experimental results,which provides an important reference for studying the meso damage mechanism of discrete particle reinforced composites.
引文
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[4]ABID M,HOU Xiaomeng,ZHENG Wenzhong,et al. High temperature and residual properties of reactive powder concrete-A review[J]. Construction and Building Materials,2017,147(8):339-351.
[5]WU Yanqing,HUANG Fenglei. A micromechanical model for predicting combined damage of particles and interface debonding in PBX explosives[J]. Mechanics of Materials,2009,41(1):27-47.
[6]GUSTAVSEN R L,SHEFFIELD S A,ALCON R R. Measurements of shock initiation in the tri-amino-tri-nitro-benzene based explosive PBX9502:wave forms from embedded gauges and comparison of four different material lots[J]. Journal of Applied Physics,2006,99(11):114907.
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[8]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):38-45.
[9]GENT A N. Detachment of an elastic matrix from a rigid spherical inclusion[J]. Journal of Materials Science,1980,15(11):2884-2888.
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