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《Rare Metal Materials and Engineering》 2017-10
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Damage Behavior of TiB_2-based Ceramic Composites under Hypervelocity Impact

Huang Xuegang;Huang Jie;Wen Xuezhong;Li Jing;Jiang Lin;Zhang Jun;Xing Yingli;Liu Sen;China Aerodynamics Research and Development Center;  
In order to improve the protective capability of spacecraft shielding configuration for hypervelocity impact of space debris, the Whipple-based shield configuration within the thin-plate bumpers of TiB_2-based ceramic composites were manufactured(i.e. the monolayer bumper of ceramic plate, the double-layer bumper of ceramic/metal plate). The hypervelocity impact experiments were carried out on a two-stage light-gas gun to compare the above novel bumpers with the typical aluminum alloy bumper under the impact velocity of 2.88~7.32 km/s. The perforation characteristics of front bumper, the damage characteristics of rear wall and the structural characteristics of debris were studied by combining the SEM fracture morphology and EDS elements distribution, especially, the relationship among the material properties and structure features of various bumpers, the formation process of debris clouds, the cratering mechanics of rear wall was discussed. The results show that the monolayer ceramic bumper can effectively smash the projectile to smaller pieces in debris cloud. Since the impact kinetic energy of projectile fragments is distributed into the smaller particles of expanded debris cloud, the protective capability of the monolayer ceramic bumper exceeds the typical aluminum alloy with equal areal density. Moreover, the protective capability of the monolayer ceramic bumper is obviously promoted with the increasing impact velocity. On the other hand, for the double-layer ceramic/metal bumper, due to the difference in acoustic impedance between the ceramic and aluminum, the impact wave could causes serious fracture in the front ceramic plate as well as the curling deformation of rear aluminum plate, and the damage degree of ceramic/metal bumper increases at higher impact velocity. Because of the larger impact fragments and the smaller expanding bubble of the debris cloud, the protective capability of the double-layer ceramic/metal bumper is worse than the traditional aluminum bumper on the contrary.
【Fund】: 国家自然科学基金(51502338)
【CateGory Index】: TB333
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