A flow law for anisotropic polycrystalline ice under uniaxial compressive deformation
A flow law for anisotropic polycrystalline ice under uniaxial compressive deformation
复制标题
单轴压缩变形下各向异性多晶冰的流动规律
DOI：
10.1016/0165-232x(94)00011-l
复制
发表时间：
1995
影响因子：
4.1
通讯作者：
N. Azuma
中科院分区：
文献类型：
--
作者：
N. Azuma
在平面应变变形过程中，用薄的柱状样品原位观察了构成多晶冰的单个颗粒的变形行为。研究了c轴取向与单晶应变之间的关系。结果表明，单个颗粒的应变与晶体取向的几何因子(滑移方向的施密德因子)成正比，与颗粒周围的局部平均应变成正比，与局部平均施密德因子成反比。此外，局部平均应变与局部平均施密德因子的4次方成正比。由此推导出，多晶冰稳态流动的应变率与集料中各颗粒施密德因子平均值的4次方成正比。
The deformation behavior of the individual grains which constitute polycrystalline ice has been observed in situ during plane strain deformation using thin, columnar-grained specimens. The relationship between the c-axis orientation and the strain of individual grains was examined. It was found that the strain of an individual grain was proportional to the geometric factor for the crystallographic orientation of the grain (the Schmid factor for the slip direction), to the local mean strain surrounding the grain and inversely proportional to the local mean Schmid factor. Moreover, the local mean strain was proportional to the fourth power of the local mean Schmid factor. From these results it is derived that the strain rate for steady state flow of polycrystalline ice is proportional to the fourth power of the mean value of the Schmid factor of each grain in the aggregate.