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本文介绍了关于复合材料动力特性的一项分析与实验研究。为得到弹道导弹防御拦截器末级的最佳结构材料,对各种候选材料基于相同的拦截器性能(包括气动弹性效应和弹体弯曲振动频率)进行了研究。比较参数是级重量和拦截器的成本。比较研究的结论是:对初始设计,采用超高模量石墨/环氧复合材料可以得到最小发射重量和最低的生产成本。文中研究了超高模量石墨/环氧结构的动力特性;进行了两种试验:1)超高模量石墨/环氧截锥壳的导弹级间分离冲击模拟试验,2)石墨/环氧试件的高应变率试验;进行了石墨/环氧材料阻尼实验;用分析方法就测得的石墨/环氧材料非线性对弹体弯曲振动频率和壳体动力稳定性的影响进行了研究。结论是:超高模量石墨/环氧结构能使有严格的频率和压力中心偏移要求的拦截器有最低的成本,同时导弹级间分离和遭遇核爆炸等动力环境不会对石墨/环氧的强度产生不利的影响。
This article presents an analysis and experimental study of the dynamic behavior of composite materials. In order to get the best structural material of ballistic missile interceptor final stage, various candidate materials were studied based on the same interceptor performance including aeroelasticity and projectile flexural vibration frequency. The comparison parameters are the grade weight and the cost of the interceptor. The comparative study concludes that for the initial design, the minimum launch weight and the lowest production cost can be achieved with ultra-high modulus graphite / epoxy composites. In this paper, the dynamic characteristics of ultra-high modulus graphite / epoxy structures were studied. Two kinds of experiments were carried out: 1) Simulation test of inter-stage separation impact of superhigh modulus graphite / epoxy cone shell, 2) graphite / epoxy The high strain rate test of the specimen was carried out. The graphite / epoxy damping experiment was carried out. The influence of the graphite / epoxy nonlinearity on the flexural vibration frequency and dynamic stability of the shell was analyzed by the analytical method. The conclusion is that the ultra-high modulus graphite / epoxy structure offers the lowest cost of interceptors with stringent frequency and pressure center offset requirements, while the dynamic separation of the missile stages and nuclear explosions does not affect the graphite / Oxygen intensity has an adverse effect.