A flow law for anisotropic ice and its application to ice sheets
A flow law for anisotropic ice and its application to ice sheets
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DOI：
10.1016/0012-821x(94)90173-2
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发表时间：
1994-12
影响因子：
5.3
通讯作者：
N. Azuma
中科院分区：
文献类型：
--
作者：
N. Azuma
针对任意轴取向织物图案，导出了多晶冰流动定律的新公式。流动定律的速率因子由几何因子给出，该几何因子可以使用 c 轴织物数据和应力条件计算。将该流动定律与组成晶粒中晶内滑移的晶格旋转模型相结合的理论计算预测了在许多实验室实验和现场观察到的特征织物图案的发展。根据多晶冰的流动模型，如果不发生显着的再结晶，单轴压缩会使冰体随着应变的增加而变硬，而简单的剪切会使冰体随着应变的增加而变软。这可能会显着影响冰盖动力学。
A new formulation of the flow law of polycrystalline ice was derived for an rbitraryc-axis orientation fabric pattern. The rate factor of the flow law is given by a geometrical factor that can be calculated withc-axis fabric data and stress condition. A theoretical calculation combining this flow law with a lattice rotation model by intracrystalline slip in the constituent grains predicts the development of characteristic fabric patterns observed in many laboratory experiments and in the field. According to this flow model of polycrystalline ice, if significant recrystallization does not occur uniaxial compression makes the ice body harder with increasing strain, whereas simple shear makes the ice body softer with strain. This may significantly affect ice sheet dynamics.