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

Biegel, R. L. and Bhat, H. S. and Sammis, C. G. and Rosakis, A .J. (2010) The effect of asymmetric damage on dynamic shear rupture propagation I: No mismatch in bulk elasticity. Tectonophysics, 493 (3-4). pp. 254-262. ISSN 0040-1951.

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High-speed digital photography was used to study rupture propagation on the interface between transparent damaged and undamaged photoelastic plates. Bilateral ruptures were nucleated on pre-machined faults at an angle α to the uniaxial loading axis. Stress concentration at the crack tips produced fringes in polarized laser light that allowed their positions to be measured in successive photos. We found that fracture damage introduces a strong asymmetry in propagation speed different from that expected due to the lower elastic stiffness in the damaged material alone. When the tensile lobe of a rupture tip propagated through the damaged material the velocity of that rupture was reduced or stopped. By contrast, when the compressive lobe of a rupture tip passed through the damage, the velocity of that rupture was unaffected by the damage. A physical interpretation is that passage of a tensile lobe through the damage expends energy by lowering the normal stress on pre-existing cracks thus allowing frictional sliding along the crack surfaces. When the compressive lobe of the rupture passes through the damage, compressive stresses prevent sliding, only minor energy is dissipated, and the damage has almost no effect on the velocity. This effect can produce asymmetric propagation for earthquake ruptures on slip surfaces near the edge of a highly damaged fault zone.

Item Type:Article
Related URLs:
Rosakis, A .J.0000-0003-0559-0794
Additional Information:© 2010 Elsevier B.V. Received 1 October 2009; revised 27 February 2010; accepted 24 March 2010. Available online 29 March 2010.
Subject Keywords:Dynamic shear rupture; Bimaterial ruptures; Damage mechanics; Supershear
Issue or Number:3-4
Record Number:CaltechAUTHORS:20101220-094237516
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Official Citation:Biegel, R. L., H. S. Bhat, et al. (2010). "The effect of asymmetric damage on dynamic shear rupture propagation I: No mismatch in bulk elasticity." Tectonophysics 493(3-4): 254-262.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:21427
Deposited By: Tony Diaz
Deposited On:20 Dec 2010 19:13
Last Modified:09 Mar 2020 13:19

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