DOI: 10.1016/j.epsl.2020.116718
论文题名: The evolution of ice fabrics: A continuum modelling approach validated against laboratory experiments
作者: Richards D.H.M. ; Pegler S.S. ; Piazolo S. ; Harlen O.G.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 556 语种: 英语
中文关键词: continuum modelling
; crystallographic preferred orientation (CPO)
; dynamic recrystallization
; ice microstructure
; migration recrystallization
; spherical harmonics
英文关键词: Continuum mechanics
; Crystals
; Deformation
; Distribution functions
; Polycrystalline materials
; Recrystallization (metallurgy)
; Silicate minerals
; Spectroscopy
; Strain rate
; Dimensionless parameters
; Efficient predictions
; Laboratory experiments
; Mass distribution function
; Parameter constraints
; Quantitative agreement
; Recrystallization process
; Strain rate dependence
; Ice
; crystallization
; crystallography
; ice crystal
; laboratory method
; model validation
; numerical model
; recrystallization
英文摘要: There remains a significant challenge to model ice crystal fabrics both accurately and efficiently within ice-sheet models. We develop the first fully constrained continuum model, validated against experiments, able to predict the evolution of a crystal fabric for any flow field or temperature. For this, we apply a mesoscopic continuum model describing the evolution of a mass distribution function of c-axis orientations. The model assumes that ice deforms by dislocation creep with slip primarily along the basal plane, and incorporates the effects of rigid-body rotation, migration recrystallization and rotational recrystallization. We solve the model using a new spectral method, which is computationally highly efficient. By constraining the model parameters using data from laboratory experiments in simple shear, we provide the first estimates of the fundamental dimensionless parameters controlling the importance of different deformation and recrystallization processes as functions of temperature, as well as the first constraints on the strain rate dependence of these parameters. With no further fitting, we apply the model to the case of compression, yielding excellent quantitative agreement with observed fabrics from corresponding experiments. The combination of the model, the spectral method and the parameter constraints as functions of temperature provide accurate and efficient predictions of ice crystal fabric evolution for general deformations, temperatures and strain rates. The model-solver (SpecCAF) can, in principle, be extended to other important polycrystalline materials including olivine, the key material in mantle dynamics. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165646
Appears in Collections: 气候变化与战略
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作者单位: Centre for Doctoral Training in Fluid Dynamics, University of Leeds, Leeds, United Kingdom; School of Mathematics, University of Leeds, Leeds, United Kingdom; School of Earth and Environment, University of Leeds, Leeds, United Kingdom
Recommended Citation:
Richards D.H.M.,Pegler S.S.,Piazolo S.,et al. The evolution of ice fabrics: A continuum modelling approach validated against laboratory experiments[J]. Earth and Planetary Science Letters,2021-01-01,556