Heterogeneous free-surface profile of B4C polycrystal under shock compression
Heterogeneous free-surface profile of B4C polycrystal under shock compression
复制标题
冲击压缩下 B4C 多晶的异质自由表面轮廓
DOI：
10.1063/1.365229
复制
发表时间：
1997
影响因子：
3.2
通讯作者：
M. Uchino
中科院分区：
文献类型：
--
作者：
T. Mashimo;M. Uchino
为了研究B_4C和Si_3N_4陶瓷材料的冲击屈服特性，采用间隙平面镜法对冲击压缩下的自由表面行为进行了观测。B_4C多晶在塑性区的运动自由表面呈锯齿状分布，其特殊尺度约为1mm，最大局部位移为几十μm。Si3N4多晶的类似轮廓是平滑的。在弹性区也观察到B4C多晶的这种分布。这些观察结果反映了固体中冲击压缩的非均匀性，并进一步表明宏观滑移系在B_4C材料在冲击压缩和减压下的弹塑性转变中起着重要作用。
Observations of the free-surface behavior under shock compression by the gapped-flat mirror method were performed on B4C and Si3N4 ceramics to study their shock-yielding properties. Jagged profiles of the moving free-surface in the plastic region, with a special scale of about one mm and a maximum local displacement of a few 10s of μm, were observed for B4C polycrystals. Similar profiles for Si3N4 polycrystals were smooth. Such profiles for B4C polycrystals were also observed in the elastic region. It is suggested that these observations reflect the heterogeneous nature of shock compression in solids, and further indicate that a macroscopic slip system plays an important role in the elastoplastic transition of B4C material under shock compression and decompression.