Elastoplastic properties under shock compression of Al2O3 single crystal and polycrystal
Elastoplastic properties under shock compression of Al2O3 single crystal and polycrystal
复制标题
Al2O3单晶和多晶冲击压缩下的弹塑性性能
DOI：
10.1063/1.340298
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发表时间：
1988
期刊：
影响因子：
--
通讯作者：
K. Nagayama
中科院分区：
文献类型：
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作者：
T. Mashimo;Yasuharu Hanaoka;K. Nagayama
通过测量 Hugoniot 压缩曲线和应力历史，研究了 Al2O3 单晶 (14–38 GPa) 和多晶 (6–33 GPa) 在冲击压缩下的弹塑性特性。单晶的休格尼奥弹性极限 (HEL) 应力确定为 14.4–17.3 GPa，孔隙率为 2.7%–3.2% 的多晶为 6.7–9.6 GPa。在塑性区域，给定密度下的单晶 Hugoniot 应力超过等温 X 射线静态数据及其外推法 6.5-8 GPa。而且，在给定密度下，多晶 Hugoniot 数据超过单晶 Hugoniot 数据约 1 GPa。这些于戈尼奥偏移不是由温度升高引起的，而是由剪切强度和剩余孔隙率引起的。单晶体的应力历史显示出与完美弹塑性材料非常相似的形状。根据 HEL 数据和准...，单晶在 HEL 和塑性区域的表观屈服应力估计为 9.5–12 GPa 和 4–6 GPa。
Elastoplastic properties of Al2O3 single crystal (14–38 GPa) and polycrystal (6–33 GPa) under shock compression were studied by the measurements of Hugoniot compression curves and stress histories. The Hugoniot‐elastic limit (HEL) stresses were determined to be 14.4–17.3 GPa for single crystals and 6.7–9.6 GPa for polycrystals with 2.7%–3.2% porosity. In the plastic region, the single‐crystal Hugoniot stresses, at a given density, exceed the isothermal x‐ray static data and its extrapolation by 6.5–8 GPa. And, the polycrystalline Hugoniot data exceeds, at a given density, the single‐crystal Hugoniot data by about 1 GPa. These Hugoniot offsets are not caused by temperature increase, but rather by the shear strength and the remaining porosity. The stress histories of a single crystal show very similar shapes to that of a perfect elastoplastic material. The apparent yield stresses of single crystal at the HEL and in the plastic region are estimated to be 9.5–12 GPa and 4–6 GPa, from the HEL data and the quas...