微粒对多晶冰及冰川流变行为的影响——(Ⅰ) 基于位错的弛豫模型

- 1 中南大学粉末冶金国家重点实验室,长沙410083 2 US Army Cold Regions Research and Engineering Laboratory, Hanover NH 03755, U.S.A. 3 Thayer School of Engineering, Dartmouth College, Hanover NH 03755, U.S.A.

收稿日期: 2005-11-12

修回日期: 2006-09-06

上线日期: 2007-01-20

Effect of fine particles on the flow behavior of polycrystalline ice and glaciers——(Ⅰ) a dislocation-based relaxation model

- 1 State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China 2 US Army Cold Regions Research and Engineering Laboratory, Hanover NH 03755, U.S.A. 3 Thayer School of Engineering, Dartmouth College, Hanover NH 03755, U.S.A.

Received Date: 12 November 2005

Revised Date: 06 September 2006

Available Online: 20 January 2007

摘要: 为量化冰及冰川在流变过程中位错密度随流变应力的变化,发展了一个基于位错的非线性弛豫模型.模型的计算表明：在冰的指数蠕变阶段，滞弹性试验所形成的应力/应变滞后环的宽度与面积随流变应力的增加呈线性增加，位错密度随流变应力的增加呈平方增加；在冰的线性蠕变阶段，滞弹性试验所形成的应力/应变滞后环的宽度、面积和位错密度保持不变.
- 冰与冰川 /
- 位错 /
- 弛豫 /
- 流变 /
- 非线性模型
Abstract: A dislocation-based nonlinear relaxation model has been developed to quantify the variations of dislocation density in ice and glaciers as a function of flow stress during flow processes. The calculation based on the model indicates that during the power-law creep stage, the stress/strain hysteresis loop width and area increase linearly with the creep stress, and dislocation density increases as a second-power with the creep stress; while during the linear creep stage, the stress/strain hysteresis loop width, area and dislocation density remain constant.
- Ice and glacier /
- Dislocation /
- Relaxation /
- Flow /
- Nonlinear model