The steady-state crystal size of deforming ice
The steady-state crystal size of deforming ice
复制标题
变形冰的稳态晶体尺寸
DOI：
10.3189/1994aog20-1-13-18
复制
发表时间：
1994
影响因子：
2.9
通讯作者：
L. Jun
中科院分区：
文献类型：
--
作者：
T. H. Jacka;L. Jun
先前的研究已经确定，在经历蠕变变形到高应变的冰中，随着优选晶体取向组构的发展，还发展了第三平衡晶体尺寸，即晶体尺寸，而不是影响蠕变速率，是变形到大应变的结果。平衡晶体尺寸在这里被认为是作为温度的函数的随时间的晶体生长与作为温度依赖性变形的结果的晶体变化之间的“平衡”。在这两个过程中的温度效应（Arrhenius关系）是相似的，考虑这两个过程的活化能表明，它可能是适当的，以消除它们，产生的平衡晶体尺寸的应力单独的依赖。稳态晶体尺寸随应力变化的实验室实验结果支持了上述观点。讨论了利用稳态晶体尺寸与偏应力之间的关系作为极地冰质压力计的可能性。
Previous studies have established that, together with the development of a preferred crystal-orientation fabric in ice undergoing creep deformation to high strains, there also develops a tertiary equilibrium crystal size, i.e. the crystal size, rather than affecting the creep rate, is a result of the deformation to large strains. Equilibrium crystal size is considered here as a “balance” between crystal growth with time as a function of temperature and crystal change as a result of temperature dependent deformation. The temperature effects in these two processes (Arrhenius relation) are similar and consideration of the activation energies for the two processes indicates that it may be appropriate to cancel them, yielding a dependence of equilibrium crystal size on stress alone. The results from laboratory experiments of steady-state crystal size plotted as a function of stress support the above proposition. The possibility of using the relationships between steady-state crystal size and deviatoric stress as a polar ice-mass piezometer is discussed.