Finite Element Simulation of Frost Wedging in Ice Shelves
Finite Element Simulation of Frost Wedging in Ice Shelves
复制标题
冰架霜楔的有限元模拟
DOI：
10.1002/pamm.201410058
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Humbert
中科院分区：
文献类型：
--
作者：
Müller R;Humbert
在过去的几年里，冰架的破裂事件得到了广泛的研究。一种流行的假设将崩解事件与冰架表面融化以及不断扩大的融水池联系起来，从而导致水力破裂。由于这种解释仅在温暖的季节成立[1]，因此考虑霜楔作为秋季和冬季破裂事件的强迫机制的可能性。只有当关闭的冰盖将裂缝内的水密封起来时，才会发生霜楔。因此，目前对单个裂缝中霜楔的研究使用冰盖厚度来评估裂缝面上的附加压力。随后对由此产生的应力强度因子作为裂纹临界性的测量进行了研究。结果表明，裂缝内的水冻结会导致最初稳定的充满水的裂缝不稳定的裂缝扩展。 （© 2014 Wiley‐VCH Verlag GmbH & Co. KGaA，魏因海姆）
Break‐up events in ice shelves have been studied extensively during the last years. One popular assumption links disintegration events to surface melting of the ice shelf in conjunction with growing melt‐water ponds, leading to hydro‐fracture. As this explanation only holds during warm seasons [1], the possibility of frost wedging as forcing mechanism for autumn and winter break‐up events is considered. Frost wedging can only occur if a closed ice lid seals the water inside the crack. Hence, the present study of frost wedging in a single crack uses ice lid thicknesses to evaluate the additional pressure on the crack faces. The investigation of the resulting stress intensity factor as a measure of crack criticality follows consequently. The results show that freezing water inside a crack can result in unstable crack growth of an initially stable water filled crack. (© 2014 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
使用有限元模拟评估冰架裂缝的严重性
DOI：
10.5194/tc-6-973-2012
发表时间：
2012
期刊：
The Cryosphere
影响因子：
--
作者：
Müller;Humbert
通讯作者：
Humbert