复杂应力动态加载下颗粒增强复合材料失效模式研究
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摘要
为解决战斗部颗粒增强复合材料因装药损伤引起局部"热点"而发生提前起爆问题,对颗粒增强复合材料在复杂应力动态加载下的损伤特性进行研究。基于一级轻气炮,对颗粒增强复合材料在三轴向冲击载荷作用下的损伤失效模式进行试验研究,分析轴向和径向边界约束条件对颗粒增强复合材料宏观损伤形式的影响,利用扫描电子显微镜(SEM)探索冲击载荷与细观损伤模式的内在关联。结果表明:颗粒增强复合材料宏观损伤特性主要表现为挤压变形;晶体颗粒表面与黏结剂剪切脱黏强度约为0.3 MPa,在较小冲击载荷作用下,颗粒表面与黏结剂已产生剪切脱黏,随冲击载荷的增大,出现晶体颗粒"孪晶带",大尺寸颗粒易受到应力集中影响,先于小尺寸颗粒发生断裂破坏,急剧冲击波能量迫使颗粒表面微裂纹发生断裂,从而演变成整个颗粒破碎情况,甚至部分出现融化现象。
In the process of air-to-ground missile attacking underground target,early initiation problems for particle reinforced composite material in the warhead often occur due to the local"hot spot",which greatly weaken the damage to the target. In order to solve this urgent problem,the damage properties of particle reinforced composites were studied under the dynamic loading of complex stress. Based on the first-stage light gas cannon,a series of experimental studies on the damage failure modes of particle reinforced composites were carried out under triaxial impact loading,and the effects of axial and radial boundary constraints on the macroscopic damage modes of particle reinforced composites were studied. The relationship between the impact load pressure and meso damage mode was investigated. The results show that the macroscopic damage characteristics of particle reinforced composites are mainly extrusion deformation. The shear debonding strength of crystal particle surface and binder is about 0.3 MPa,and under the action of small impact load,shear debonding is produced between the particle surface and binder. Increasing with the impact load pressure,the crystal particle"twin zone"appears,and the large size particles are susceptible to stress concentration,and fracture before the small size particles. The sharp shock wave energy forces the microcracks on the surface of the particles to fracture,which leads to the whole particle fragmentation and even some melting phenomena.
In the process of air-to-ground missile attacking underground target,early initiation problems for particle reinforced composite material in the warhead often occur due to the local"hot spot",which greatly weaken the damage to the target. In order to solve this urgent problem,the damage properties of particle reinforced composites were studied under the dynamic loading of complex stress. Based on the first-stage light gas cannon,a series of experimental studies on the damage failure modes of particle reinforced composites were carried out under triaxial impact loading,and the effects of axial and radial boundary constraints on the macroscopic damage modes of particle reinforced composites were studied. The relationship between the impact load pressure and meso damage mode was investigated. The results show that the macroscopic damage characteristics of particle reinforced composites are mainly extrusion deformation. The shear debonding strength of crystal particle surface and binder is about 0.3 MPa,and under the action of small impact load,shear debonding is produced between the particle surface and binder. Increasing with the impact load pressure,the crystal particle"twin zone"appears,and the large size particles are susceptible to stress concentration,and fracture before the small size particles. The sharp shock wave energy forces the microcracks on the surface of the particles to fracture,which leads to the whole particle fragmentation and even some melting phenomena.
引文
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[3]XIAO Youcai,SUN Yi,LI Xiao,et al.Dynamic compressive properties of polymer bonded explosives under confining pressure[J].Propellants Explosives Pyrotechnics,2017,42(8):873-822.
[4]BORONSKI Dariusz,KOTYK Maciej,MACKOWIAK Pawel,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.
[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]XIAO Youcai,SUN Yi,ZHEN Yubao,et al.Characterization,modeling and simulation of the impact damage for polymer bonded explosives[J].International Journal of Impact Engineering,2017,103:149-158.
[7]DRODGE D R,WILLIAMSON D M.Understanding damage in polymer-bonded explosive composites[J].Journal of Materials Science,2016,51(2):668-679.
[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.
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