DOI: 10.5194/tc-10-3071-2016
Scopus记录号: 2-s2.0-85007248587
论文题名: Strain localization and dynamic recrystallization in the ice-air aggregate: A numerical study
作者: Steinbach F ; , Bons P ; D ; , Griera A ; , Jansen D ; , Llorens M ; -G ; , Roessiger J ; , Weikusat I
刊名: Cryosphere
ISSN: 19940416
出版年: 2016
卷: 10, 期: 6 起始页码: 3071
结束页码: 3089
语种: 英语
英文关键词: dynamic response
; firn
; grain size
; heterogeneity
; ice mechanics
; lattice dynamics
; microstructure
; numerical method
; orientation
; plastic deformation
; recrystallization
; rheology
; strain analysis
; Antarctica
; East Antarctica
; Queen Maud Land
英文摘要: We performed numerical simulations on the microdynamics of ice with air inclusions as a second phase. Our aim was to investigate the rheological effects of air inclusions and explain the onset of dynamic recrystallization in the permeable firn. The simulations employ a full-field theory crystal plasticity code coupled to codes simulating dynamic recrystallization processes and predict time-resolved microstructure evolution in terms of lattice orientations, strain distribution, grain sizes and grain-boundary network. Results show heterogeneous deformation throughout the simulations and indicate the importance of strain localization controlled by air inclusions. This strain localization gives rise to locally increased energies that drive dynamic recrystallization and induce heterogeneous microstructures that are coherent with natural firn microstructures from EPICA Dronning Maud Land ice coring site in Antarctica. We conclude that although overall strains and stresses in firn are low, strain localization associated with locally increased strain energies can explain the occurrence of dynamic recrystallization. © Author(s) 2016. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75020
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
There are no files associated with this item.
作者单位: Department of Geosciences, Eberhard Karls University Tübingen, Tübingen, Germany; Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany; Departament de Geologia, Universitat Autònoma de Barcelona, Bellaterra (Barcelona), Spain
Recommended Citation:
Steinbach F,, Bons P,D,et al. Strain localization and dynamic recrystallization in the ice-air aggregate: A numerical study[J]. Cryosphere,2016-01-01,10(6)