Propagating compaction bands in confined compression of snow

Rapid deformation leaves insufficient time for sintering to restore broken bonds; snow is at high rates of deformation weaker than at low rates

Thomas W. Barraclough

2016

Scholarcy highlights

  • 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
  • Rapid deformation leaves insufficient time for sintering to restore broken bonds; snow is at high rates of deformation weaker than at low rates
  • This goes along with a transition from quasi-plastic to quasi-brittle deformation behaviour, which has been observed in shear as well as in compressive deformation
  • The moving deformation bands appear on the spacetime plots as inclined zones of high strain rate
  • Systematic investigation of a series of artificial snow samples of different age ta ranging from 3 × 102 s to 3 × 105 s reveals that the stress required for initiation and propagation of the first deformation band and the band strain increase with specimen age

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