Abstract
Snow slab avalanche release involves brittle fracture. The fracture criterion in mixed mode for dry snow ( ρ=170 kg m −3) was determined by cantilever beam experiments: ( K Ic 2+ K IIc 2) 1/2=430±90 Pa m 1/2. Fracture toughness in shear, K IIc, is about the same as in tension, K Ic.
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