A Condition for Super-shear Rupture Propagation in a Heterogeneous Stress Field

2002 ◽  
pp. 2047-2056 ◽  
Author(s):  
Eiichi Fukuyama ◽  
Kim B. Olsen
Keyword(s):  
Stress Field ◽  
Rupture Propagation ◽  
Shear Rupture

A Condition for Super-shear Rupture Propagation in a Heterogeneous Stress Field

2002 ◽  
Vol 159 (9) ◽  
pp. 2047-2056 ◽  
Author(s):  
E. Fukuyama ◽  
K. B. Olsen
Keyword(s):  
Stress Field ◽  
Rupture Propagation ◽  
Shear Rupture

The effect of asymmetric damage on dynamic shear rupture propagation I: No mismatch in bulk elasticity

2010 ◽  
Vol 493 (3-4) ◽  
pp. 254-262 ◽  
Author(s):  
R.L. Biegel ◽  
H.S. Bhat ◽  
C.G. Sammis ◽  
A.J. Rosakis
Keyword(s):  
Rupture Propagation ◽  
Dynamic Shear ◽  
Shear Rupture ◽  
Bulk Elasticity

MODEL INVESTIGATION OF EXPLOSIONS IN PRESTRESSED MEDIA

Geophysics ◽  
1967 ◽  
Vol 32 (4) ◽  
pp. 633-651 ◽  
Author(s):  
W. H. Kim ◽  
C. Kisslinger
Keyword(s):  
Stress Field ◽  
Energy Release ◽  
Strain Energy ◽  
Strain Energy Release ◽  
Direct Consequence ◽  
Rupture Propagation ◽  
S Wave ◽  
Elastic Zone ◽  
Radiation Fields ◽  
Aluminum Sheets

Seismic effects of explosions and rupture propagation in prestressed two‐dimensional models (Plexiglas, aluminum) as well as anisotropy produced by the stress field are investigated. An explosion in a prestressed medium releases a portion of the stored strain energy by one or more of the following mechanisms: (1) formation of directional cracking, especially in brittle materials, (2) release of strain energy in the elastic zone outside the cavity, and (3) rupture propagation. Phenomena associated with all of these mechanisms were observed in the present investigation. Explosions in prestressed Plexiglas produce cracks in preferred directions, the intensity of which increases with the applied stress. Explosions in prestressed aluminum sheets do not cause fracturing but rather plastic deformation about the explosion. Straight and branching modes of moving cracks initiated from explosions in prestressed Plexiglas can be explained on the basis of stress distribution ahead of the crack tips. Observed radiation patterns resulting from explosions in prestressed media indicate asymmetrical radiation fields which are a direct consequence of strain energy release for the case of aluminum and by the combined effects of directional cracking and energy release in the elastic zone for the case of Plexiglas. Explosions in prestressed media generate shear waves. The observed S‐wave magnitude increases sharply with the level of the existing stress field for a given amount of strain energy release. It is concluded that this phenomenon is attributable to the effective conversion of energy release to seismic radiation at high ambient stress fields. In other words, the effectiveness of S‐wave generation is governed by the rapidity with which the existing strain energy is released. A definite anisotropy effect was observed in prestressed models, but this effect is not large enough to affect wave propagation in the range of the tensile loads applied.

The effect of asymmetric damage on dynamic shear rupture propagation II: With mismatch in bulk elasticity

2010 ◽  
Vol 493 (3-4) ◽  
pp. 263-271 ◽  
Author(s):  
H.S. Bhat ◽  
R.L. Biegel ◽  
A.J. Rosakis ◽  
C.G. Sammis
Keyword(s):  
Rupture Propagation ◽  
Dynamic Shear ◽  
Shear Rupture ◽  
Bulk Elasticity

Fan-Hinged Shear as a Unique Mechanism of Dynamic Shear Ruptures

2016 ◽  
Vol 258 ◽  
pp. 165-168
Author(s):  
Boris Tarasov ◽  
Mikhail Guzev ◽  
Vladimir Sadovskiy ◽  
Alexander Losev
Keyword(s):  
Mathematical Model ◽  
Shear Resistance ◽  
Rupture Propagation ◽  
Dynamic Shear ◽  
Tensile Cracks ◽  
Frictional Strength ◽  
Shear Rupture ◽  
Rupture Mechanism ◽  
Unique Mechanism ◽  
Low Shear

Recently a new fan-hinged shear rupture mechanism has been identified as a unique mechanism of dynamic shear ruptures. In the fan-mechanism, the shear rupture propagation is driven by a fan-shaped rupture head consisting of an echelon of intercrack (domino-like) blocks formed due to the consecutive creation of small tensile cracks in the rupture tip. The fan-structure propagates through the intact material as a wave and has a number of extraordinary features, one of which is extremely low shear resistance of the rupture head (below the frictional strength). Here we present a mathematical model elucidating the principles of this new mechanism. The model will support comprehensive studies of unique features of the discovered phenomenon.

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