Rapid Healing of Thermal Cracks in Ice
Rapid Healing of Thermal Cracks in Ice
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DOI：
10.1029/2022gl099771
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发表时间：
2022-08
影响因子：
5.2
通讯作者：
A. Murdza;E. Schulson;C. Renshaw;Arttu Polojärvi
中科院分区：
文献类型：
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作者：
A. Murdza;E. Schulson;C. Renshaw;Arttu Polojärvi
北极海冰覆盖层的结构完整性正受到威胁，这主要是由于变薄和更大的海浪的共同作用。另一个贡献者可能是热裂化。在应力集中时，热裂纹可能会削弱保护层。因此，令人感兴趣的是热损伤冰的强度。为此，在海冰和实验室生长的盐水和无盐冰上进行了新的实验，这些冰已经被热冲击破裂。正如预期的那样，裂缝削弱了材料，符合断裂力学的雅阁。不过，仅仅只是数十秒、数百秒的震撼，力量就完全恢复了，因为冰层已经愈合。愈合归因于与表面扩散相关的热活化烧结，可能通过在裂纹面上形成准液体层来辅助。小规模的行为是否代表大规模的行为仍有待确定。
The structural integrity of the arctic sea ice cover is under threat owing largely to the combination of thinning and larger waves. Another contributor may be thermal cracking. In concentrating stress, thermal cracks may weaken the cover. Of interest, therefore, is the strength of thermally damaged ice. To that end, new experiments were performed on sea ice and on lab‐grown saline and salt‐free ice that had been cracked by thermal shocking. As expected, the cracks weakened the materials in accord with fracture mechanics. However, within tens to hundreds of seconds of shocking, the strength recovered completely, for the ice had healed. Healing is attributed to thermally activated sintering related to surface diffusion, assisted possibly by the formation of a quasi‐liquid layer on crack faces. Whether behavior on the small scale is indicative of behavior on the large scale remains to be determined.