Laboratory measurements of the rate dependence of the fracture toughness anisotropy of Barre granite

2013 ◽  
Vol 60 ◽  
pp. 57-65 ◽  
Author(s):  
F. Dai ◽  
K.W. Xia
Keyword(s):  
Fracture Toughness ◽  
Rate Dependence ◽  
Laboratory Measurements ◽  
Fracture Toughness Anisotropy ◽  
Barre Granite

scholarly journals On the fracture toughness of snow

2004 ◽  
Vol 38 ◽  
pp. 1-8 ◽  
Author(s):  
Jürg Schweizer ◽  
Gerard Michot ◽  
Helmut O.K. Kirchner
Keyword(s):  
Fracture Toughness ◽  
Crack Size ◽  
Laboratory Measurements ◽  
Critical Crack ◽  
Arrhenius Relation ◽  
Linear Fracture ◽  
Different Temperatures ◽  
Increasing Temperature ◽  
Critical Crack Size ◽  
Key Parameter

AbstractThe release of a dry-snow slab avalanche involves brittle fracture. It is therefore essentially a non-linear fracture mechanics problem. Traditional snow-stability evaluation has mainly focused on snow strength measurements. Fracture toughness describes how well a material can withstand failure. The fracture toughness of snow is therefore a key parameter to assess fracture propagation propensity, and hence snows lope stability. Fracture toughness in tension KIc and shear KIIc was determined with notched cantilever-beam experiments in a cold laboratory. Measurements were performed at different temperatures and with different snow types of density ρ = 100–300 kgm–3, corresponding to typical dry-snow slab properties. The fracture toughness in tension KIc was found to be larger (by about a factor of 1.4) than in shear KIIc. Typical values of the fracture toughness were 500–1000 Pam1/2 for the snow types tested. This suggests that snow is one of the most brittle materials known to man. A power-law relation of toughness KIc on relative density was found with an exponent of about 2. The fracture toughness in tension KIc decreased with increasing temperature following an Arrhenius relation below about –8°C with an apparent activation energy of about 0.16 eV. Above –6°C the fracture toughness increased with increasing temperature towards the melting point, i.e. the Arrhenius relation broke down. The key property in dry-snow slab avalanche release, the critical crack size under shear at failure, was estimated to be about 1 m.

Fracture toughness anisotropy by indentation and SEVNB on tetragonal PZT polycrystals

2001 ◽  
Vol 319-321 ◽  
pp. 692-696 ◽  
Author(s):  
J.M Calderon-Moreno ◽  
Monica Popa
Keyword(s):  
Fracture Toughness ◽  
Fracture Toughness Anisotropy

Fracture toughness anisotropy of a pyrolytic carbon

1986 ◽  
Vol 21 (5) ◽  
pp. 1491-1501 ◽  
Author(s):  
M. Sakai ◽  
R. C. Bradt ◽  
D. B. Fischbach
Keyword(s):  
Fracture Toughness ◽  
Pyrolytic Carbon ◽  
Fracture Toughness Anisotropy

Low temperature and strain rate dependence of fracture stress and fracture toughness on thin Fe40Ni40B20 amorphous ribbon

1991 ◽  
Vol 26 (24) ◽  
pp. 6699-6705 ◽  
Author(s):  
V. Ocelík ◽  
V. Z. Bengus ◽  
E. B. Korolkova ◽  
K. Csach ◽  
J. Miškuf ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Low Temperature ◽  
Strain Rate ◽  
Fracture Stress ◽  
Amorphous Ribbon ◽  
Rate Dependence ◽  
Strain Rate Dependence

Loading rate dependence of mode II fracture toughness in laminated composites reinforced by carbon nanotube films

2021 ◽  
Vol 215 ◽  
pp. 109005
Author(s):  
Zhouyi Li ◽  
Zhen Wang ◽  
Weibang Lu ◽  
Xi Zhou ◽  
Tao Suo
Keyword(s):  
Fracture Toughness ◽  
Carbon Nanotube ◽  
Loading Rate ◽  
Laminated Composites ◽  
Rate Dependence ◽  
Mode Ii ◽  
Mode Ii Fracture ◽  
Mode Ii Fracture Toughness ◽  
Nanotube Films
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