DOI: 10.1002/2015GL064666
论文题名: The constant-hardness creep compliance of polycrystalline ice
作者: Caswell T.E. ; Cooper R.F. ; Goldsby D.L.
刊名: Geophysical Research Letters
ISSN: 0094-8615
EISSN: 1944-8346
出版年: 2015
卷: 42, 期: 15 起始页码: 6261
结束页码: 6268
语种: 英语
英文关键词: creep compliance
; grain boundary sliding
; state-variable rheology
; stress-reduction experiments
Scopus关键词: Creep
; Grain boundaries
; Hardness
; Microstructural evolution
; Creep compliance
; Dislocation structures
; Microstructural features
; Microstructural state
; Polycrystalline ice
; State variables
; Stress reduction
; Subgrain boundaries
; Grain boundary sliding
; creep
; crystallinity
; deformation
; dislocation
; experimental study
; hardness
; hydrogeology
; ice crystal
; microstructure
; rheology
; stress
; temperature effect
; viscosity
英文摘要: We have performed creep and stress-reduction experiments on polycrystalline ice (grain sizes, d ≈ 30 and ≈ 245 μm) in the grain boundary sliding and dislocation creep regimes (stresses σ = 0.5-5 MPa, temperature T = 233 K) to determine the constant-hardness creep compliance under these conditions. Our results are consistent with a microstructural state-variable description of dislocation-effected deformation whose rate is accelerated by grain boundary sliding. The fine-grained specimens reveal no subgrain boundaries, indicating that the stress-sensitive microstructural feature upon which the state-variable behavior is founded may be the dislocation structure of the grain boundaries. Deviations of our constant-hardness data from the behavior predicted by the state-variable formulation allow estimation of the viscosity of the grain boundaries, which is ∼4.8 × 106 Pa s at this temperature. ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84940448985&doi=10.1002%2f2015GL064666&partnerID=40&md5=7cd43bb29bfbaa7145d94e1fe1c583b8
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8231
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Earth, Environmental, and Planetary Sciences, Brown University, Providence, RI, United States
Recommended Citation:
Caswell T.E.,Cooper R.F.,Goldsby D.L.. The constant-hardness creep compliance of polycrystalline ice[J]. Geophysical Research Letters,2015-01-01,42(15).