Creep of polar firn

Meussen, B.; Mahrenholtz, O.; Oerter, Hans

doi:10.1016/s0165-232x(99)00018-x

Cited by 10 publications

(20 citation statements)

References 13 publications

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“…The first number in the legend is temperature (°C), the second is snow density (kg/m 3 ), and the third is the applied pressure (kPa). (CSU is Chandel et al 2007, and MMO is Meussen et al 1999 Mellor and Smith (1966) (symbols) to Equation (7) (line) for the snow temperatures indicated and applied stress of 49 kPa. Note that for the temperature of −20°C, the ABAQUS constitutive model that follows was applied to a single element model and that the results between the finite element model and Equation (7) Reed (1974).…”

Section: Figures and Tablesmentioning

confidence: 99%

“…Meussen et al (1999) looked at the creep response of varyingdensity snow subjected to increasing applied loads at a constant temperature of −20°C. Chandel et al (2007) provides data for a range of temperatures (−3°C to −9°C) while holding the load and density constant.…”

Section: Primary Creepmentioning

confidence: 99%

“…Meussen et al (1999) fit their strain data to an equation of the form ε = Ct n . The strain rate is quite simply the time derivative of this expression: ̇ = nCt n−1 .…”

Section: Primary Creepmentioning

confidence: 99%

“…The strain rate is quite simply the time derivative of this expression: ̇ = nCt n−1 . Therefore, I can use values of C and n determined by Meussen et al (1999) to get an estimate for Cρ and p = n−1 for Equation (1). I adjusted the fit used by Meussen et al (1999) to more of a creep power law form (ε = C′CTσ q t n ) and recomputed the constant after accounting for the inclusion of stress and temperature.…”

Section: Primary Creepmentioning

confidence: 99%

“…The deformation of snow under a constant load (creep deformation, or simply "creep") is dependent on both the density and temperature of the snow. Mellor and Smith (1966), Mellor (1969), Reed (1966Reed ( , 1974, Kovacs (1967), Meussen et al (1999) and Chandel et al (2007) have previously studied this creep behavior. Creep is normally characterized as proceeding in three phases as depicted in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

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A creep model for high-density snow

Haehnel¹

2017

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This effort modifies Mellor and Smith's creep model for dense snow to conform to the more general creep power law form (Glen's creep law for ice is a special case of this power law). The present study used this general form as the basis for developing two creep models: one to describe the primary creep and another that models secondary creep response as a function of applied stress, snow density, and temperature. Available laboratory data helped to determine the parameters for these models. These models were recast into a form compatible with the ABAQUS finite element software to allow simulation of settlement of a snow foundation subjected to a long-term load.The secondary creep model was validated against the observed settlement of a spread foundation on snow at Camp Century, Greenland. Though there were not suitable field data to validate the primary creep model, comparison of that model to results obtained for the secondary creep model demonstrate that the primary creep model behaved as expected. Additional work is necessary to merge the primary and secondary creep models and to further validate the primary creep response of the model presented here.

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Section: Figures and Tablesmentioning

confidence: 99%

Section: Primary Creepmentioning

confidence: 99%

“…Meussen et al (1999) fit their strain data to an equation of the form ε = Ct n . The strain rate is quite simply the time derivative of this expression: ̇ = nCt n−1 .…”

Section: Primary Creepmentioning

confidence: 99%

Section: Primary Creepmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A creep model for high-density snow

Haehnel¹

2017

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In situ X-ray tomography densification of firn: The role of mechanics and diffusion processes

Burr¹,

Lhuissier²,

Martín³

et al. 2019

Acta Materialia

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One of the most efficient proxy methods for paleoclimatology consists of obtaining data previously preserved within polar ice cores. Models for past climate reconstruction are based in particular on the characterization of entrapped gases in ice closed pores. Improving the temporal accuracy of these models requires a better understanding of firn densification mechanisms. In particular, the interplay between viscoplastic deformation and diffusion processes for pore closure is not well understood. In this work, we describe the first in situ laboratory densification experiments on polar firn retrieved from Antarctica with live characterization by X-ray tomography. Our in situ tests allow for the first time to approximately access the process of pore closure in ice, which takes thousands of years to occur in Antarctica, from visualizations and quantitative analyses of short time laboratory experiments. The parameters of pore separation and closure and the microstructural changes that accompany them are monitored. We show that densification of polar

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Creep and creep fracture/damage finite element modelling of engineering materials and structures: an addendum

Mackerle¹

2004

International Journal of Pressure Vessels and Piping

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Creep of polar firn

Cited by 10 publications

References 13 publications

A creep model for high-density snow

A creep model for high-density snow

In situ X-ray tomography densification of firn: The role of mechanics and diffusion processes

Creep and creep fracture/damage finite element modelling of engineering materials and structures: an addendum

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