Effect of characteristics of materials on fracture behavior and modeling using graphite-related materials with a high-velocity steel sphere
Effect of characteristics of materials on fracture behavior and modeling using graphite-related materials with a high-velocity steel sphere
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DOI：
10.1016/s0734-743x(03)00013-7
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发表时间：
2003-10
影响因子：
5.1
通讯作者：
K. Fujii;E. Yasuda;T. Akatsu;Y. Tanabe
中科院分区：
文献类型：
--
作者：
K. Fujii;E. Yasuda;T. Akatsu;Y. Tanabe
为了研究石墨类材料的冲击断裂行为，采用二级轻气炮加速高速钢球撞击3种多晶石墨和2D-C/C复合材料。多晶石墨具有不同的最大粒径和静态耗散能。用高速分幅照相机对这些试样的冲击（正面）表面进行拍照，对冲击断裂进行了原位观察。冲击波产生的高压在撞击后立即产生一系列类似流体的细小碎片。碎片的表观体积取决于最大粒径，但与试样的厚度无关。冲击表面的裂纹形态与静态耗散能密切相关。具有最低耗散能的石墨的断裂行为被分为两种情况：在后表面上有断裂和没有断裂。在后一种情况下，裂纹出现的时间是冲击速度的函数。然而，在前一种情况下，冲击速度和试样厚度的影响裂纹出现的时间。
In order to investigate the impact fracture behavior of graphite-related materials, high-velocity steel spheres accelerated by a two-stage light gas gun were impacted onto three kinds of polycrystalline graphites and a 2D-C/C composite. The polycrystalline graphites have different maximum particle sizes and static dissipation energies. The in situ observation of impact fracture was performed by taking photographs with high-speed framing cameras of the impacted (front) surfaces of those specimens. High pressure caused by shock wave produced a gush of fine fragments in a fluidlike manner immediately after the impact. The apparent volume of fragments was dependent on the maximum particle size, but independent of the thickness of the specimen. The crack patterns of the impacted surface were closely related to the static dissipation energy. The fracture behavior of graphite having the lowest dissipation energy was classified into two cases: with and without fracturing on the rear surface. In the latter case, the time of crack appearance was a function of impact velocity. However, in the former case, both impact velocity and specimen thickness influenced the time of crack appearance.