高密度雪の圧縮実験　　Ｉ―塑性型変形と破壊型変形―

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タイトル別名
  • Compression experiments of high-density snow I-Plastic-type and destructive-type deformations-
  • コウミツド ユキ ノ アッシュク ジッケン 1 ソセイガタ ヘンケイ ト ハカイガタ ヘンケイ
  • Plastic-type and destructive-type deformations
  • 塑性型変形と破壊型変形

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Compression measurements were conducted by using a rod to penetrate high-density snow, which is defined as snow with a bulk density larger than the maximum packing density.Two types of deformation were recognized plastic-type and destructive-type deformations.In the plastictype deformation, the relation between the stress and strain rates was nonlinear, hence, this deformation is not Newtonian and is expressed by a power law.This suggests that in addition to the particle rearrangement operative in low-density snow, plastic-type deformation and destruction of ice particles are also important.The critical penetration speeds between the two deformation types were 0.33∼0.83, 0.83∼1.67 and 1.67∼3.33 mm/s for snow densities of 550, 640 and 730kg/m3, respectively.The power increased with density and approached 3, which correspond to that required for penetrating ice.The elastic modulus estimated from the slopes of the saw-tooth records was 100MPa∼1GPa, which increased with speed and density.Further, the destructive strength was 0.2∼8MPa, which also increased with density.

収録刊行物

  • 雪氷

    雪氷 68 (2), 123-130, 2006

    公益社団法人 日本雪氷学会

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