DOI: 10.5194/tc-15-2415-2021
论文题名: Behavior of saline ice under cyclic flexural loading
作者: Murdza A. ; Schulson E.M. ; Renshaw C.E.
刊名: Cryosphere
ISSN: 19940416
出版年: 2021
卷: 15, 期: 5 起始页码: 2415
结束页码: 2428
语种: 英语
英文关键词: cryosphere
; cyclic loading
; experiment
; laboratory method
; saline lake
英文摘要: New systematic experiments reveal that the flexural strength of saline S2 columnar-grained ice loaded normal to the columns can be increased upon cyclic loading by about a factor of 1.5. The experiments were conducted using reversed cyclic loading over ranges of frequencies from 0.1 to 0.6 Hz and at a temperature of-10 ĝ C on saline ice of two salinities: 3.0 ± 0.9 and 5.9 ± 0.6 ‰. Acoustic emission hit rate during cycling increases with an increase in stress amplitude of cycling. Flexural strength of saline ice of 3.0 ± 0.9 ‰ salinity appears to increase linearly with increasing stress amplitude, similar to the behavior of laboratory-grown freshwater ice (Murdza et al., 2020b) and to the behavior of lake ice (Murdza et al., 2021). The flexural strength of saline ice of 5.9 ± 0.6 ‰ depends on the vertical location of the sample within the thickness of an ice puck; i.e., the strength of the upper layers, which have a lower brine content, was found to be as high as 3 times that of lower layers. The fatigue life of saline ice is erratic. Cyclic strengthening is attributed to the development of an internal back stress that opposes the applied stress and possibly originates from dislocation pileups. © 2021 Andrii Murdza et al. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164768
Appears in Collections: 气候变化与战略
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作者单位: Thayer School of Engineering, Dartmouth College, Hanover, NH 03755, United States; Department of Earth Sciences, Dartmouth College, Hanover, NH 03755, United States
Recommended Citation:
Murdza A.,Schulson E.M.,Renshaw C.E.. Behavior of saline ice under cyclic flexural loading[J]. Cryosphere,2021-01-01,15(5)