Dynamic deformation of polycrystalline alumina
Dynamic deformation of polycrystalline alumina
复制标题
DOI：
10.1063/1.325766
复制
发表时间：
1979-10
影响因子：
3.2
通讯作者：
D. Munson;R. Lawrence
中科院分区：
文献类型：
--
作者：
D. Munson;R. Lawrence
在一维应变条件下，用干涉法测量了多晶Al_2O_3在应力波加载和卸载时的动态应力波响应，并用倾斜的电阻片测量了加载到约50 GPa时的动态应力波响应。应力波加载和卸载测量具有较高的分辨率，显示出9.1 Gpa的弹性前兆波(速度为10.9公里/S)和一个较慢的色散永久变形波。在这些实验的应力范围内，卸载是弹性的。加载和卸载波的传播均采用Maxwell弹性应力松弛模型，其屈服应力为5.8 Gpa，松弛时间为70 ns。速率相关模型正确地预测了永久变形波的频散和卸载波的行为。氧化铝的体相压力-体积行为由激波-速度-质点-速度关系式给出：us=8.14+1.28up(Km/S)。对动态整体响应进行了热力学修正，得到了等温线。
Using one‐dimensional strain conditions, the dynamic stress‐wave response of polycrystalline Al2O3 was measured with interferometry in both stress‐wave loading and unloading to about 16 GPa and with slanted resistor gauges in loading to about 50 GPa. The stress‐wave loading and unloading measurements were of high resolution and showed a 9.1‐GPa elastic precursor wave (velocity 10.9 km/s) followed by a slower dispersive permanent deformation wave. Unloading was elastic in the stress range of these experiments. Both loading and unloading wave propagation were modeled well with a Maxwellian elastic‐stress‐relaxing model with a yield stress of 5.8 GPa and a relaxation time of 70 ns. The rate‐dependent model correctly predicts both the dispersion of the permanent deformation wave and the unloading‐wave behavior. The bulk pressure‐volume behavior of alumina is given by the shock‐velocity–particle‐velocity relationship of Us=8.14 +1.28up (km/s). Thermodynamic corrections to the dynamic bulk response yielded isot...