期刊
NATURE PHYSICS
卷 13, 期 3, 页码 272-275出版社
NATURE PORTFOLIO
DOI: 10.1038/NPHYS3966
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资金
- EPSRC - DTP
Some materials are strong in response to a slowly applied deformation, yet weak when subject to rapid deformations-a materials property known as strain-rate softening(1). Snow exhibits such behaviour: it is comparatively strong at lowdeformation rates, where it is quasi-plastic, but weak at high rates, where it deforms in a quasi-brittle manner(2). During deformation, strain-rate-softening materials ranging from metals(3,4) to micellar systems(5) exhibit complex spatio-temporal deformation patterns, including regular or chaotic deformation-rate oscillations and travelling deformation waves(6). Here we report a systematic investigation of such phenomena in snow and showthat snowcan deform with the formation and propagation of localized deformation bands accompanied by oscillations of the driving force. We propose a model that accounts for these observations. Our findings demonstrate that in snow, strain localization can occur even in initially homogeneous samples deforming under homogeneous loads.
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