Age Hardening of Snow at the South Pole
Age Hardening of Snow at the South Pole
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DOI：
10.3189/s0022143000028069
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发表时间：
1963-06
影响因子：
3.4
通讯作者：
A. Gow;R. Ramseier
中科院分区：
文献类型：
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作者：
A. Gow;R. Ramseier
在南极对人工和自然压实的雪的时效硬化进行了研究。结果表明，低温下时效硬化过程大大减慢。密度为0.55 g./kg的压实样品cm. 3获得小于3.0 kg./cm.在-49 ° C下老化一年后，暴露于太阳辐射加速老化硬化。辐照样品的强度达到6.0 kg。100小时后，增加到8.0 kg的虚拟最大值。/ cm.2。抗压强度随着雪颗粒尺寸的减小和颗粒棱角度的增加而增加。低于3米。发现自然压实的雪的强度随着密度的增加而迅速增加。密度为0.55克的天然压实雪。/ cm.3的雪具有比相同密度的人工压实雪的任何老化硬化样品大得多的强度。薄截面研究表明，时效硬化可以与晶间键的形成和增长，和债券增长下降福尔斯迅速降低温度。鉴于南极地表附近的自然压实雪和人工压实雪的强度都很低，在南极建造雪下营地可能不太实际。
The age hardening of artificially and naturally compacted snow has been investigated at the South Pole. Results show that the age-hardening process is greatly retarded at low temperatures. Artificially compacted samples of density 0.55 g./cm.3 attained a compressive strength of less than 3.0 kg./cm.2 after one year’s ageing at −49° C. Exposure to solar radiation accelerated the age hardening. Irradiated samples attained a strength of 6.0 kg./cm.2 after 100 hr., increasing to a virtual maximum of 8.0 kg./cm.2 at the end of 600 hr. Compressive strengths increased with decrease in snow-particle size and with increasing angularity of the particles. Below 3 m. the strength of naturally compacted snow was found to increase rapidly with increase in density. Naturally compacted snow of density 0.55 g./cm.3 possessed considerably greater strength than any of the age-hardened samples of artificially compacted snow of the same density. Thin-section studies show that age hardening can be correlated with the formation and growth of intergranular bonds, and that bond growth falls off rapidly with decreasing temperature. In view of the low strengths found in both naturally compacted snows near the surface and in artificially compacted snow at the South Pole, “cut-and-cover” under-snow camp construction may not prove too practical at the South Pole.