A grain-size driven transition in the deformation mechanism in slow snow compression

DOI

We conducted consecutive loading-relaxation experiments at low strain rates to study the viscoplastic behavior of the intact ice matrix in snow. The experiments were conducted using a micro-compression stage within the X-ray tomography scanner in the SLF cold laboratory.

Next, to evaluate the experiments, a novel, implicit solution of a transient scalar model was developed to estimate the stress exponent and time scales in the effective creep relation (Glen's law). The result reveals that, for the first time, a transition in the exponent in Glen's law depends on geometrical grain size. A cross-over of stress exponent $n=1.9$ for fine grains to $n=4.4$ for coarse grains is interpreted as a transition from grain boundary sliding to dislocation creep.

The dataset includes compression force data from 11 experiments and corresponding 3D image data from tomography scans.

Identifier
DOI https://doi.org/10.16904/envidat.436
Metadata Access https://www.envidat.ch/api/action/package_show?id=2fbce191-4283-4b68-aa4c-ad90723146ed
Provenance
Creator Kavitha, Sundu, 0000-0002-0445-8591; Rafael, Ottersberg,; Matthias, Jaggi,; Henning, Löwe, 0000-0001-7515-6809
Publisher EnviDat
Publication Year 2023
Funding Reference SNSF, 200020_178831
Rights odc-odbl; ODbL with Database Contents License (DbCL)
OpenAccess true
Contact envidat(at)wsl.ch
Representation
Language English
Resource Type Dataset
Version 1.0
Discipline Environmental Sciences
Spatial Coverage (9.842 LON, 46.810 LAT); Switzerland
Temporal Coverage Begin 2021-08-10T00:00:00Z
Temporal Coverage End 2023-01-16T00:00:00Z