Rosakis, Ares J. and Samudrala, Omprakash and Coker, Demirkan (2000) Intersonic shear crack growth along weak planes. Materials Research Innovations, 3 (4). pp. 236-243. ISSN 1432-8917. doi:10.1007/s100190050009. https://resolver.caltech.edu/CaltechAUTHORS:20190930-110457541
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Abstract
Classical dynamic fracture theories predict the Rayleigh surface wave speed (c_R ) to be the limiting speed of propagation for mode-I cracks in constitutively homogeneous, isotropic, linear elastic materials subjected to remote loading. For mode-II cracks, propagating along prescribed straight line paths, the same theories, while excluding the possibility of crack growth in the speed regime between c_R and the shear wave speed, c_s , do not exclude intersonic (c_s <υ<c_l ) crack tip speeds. In the present study, we provide the first experimental evidence of intersonic crack growth in such constitutively homogeneous and isotropic solids, ever recorded in a laboratory setting. Intersonic shear dominated crack growth, featuring shear shock waves, was observed along weak planes in a brittle polyester resin under far-field asymmetric loading. The shear cracks initially propagate at speeds just above c_s and subsequently accelerate rapidly to the longitudinal wave speed (c_l) of the solid. At longer times, when steady state conditions are attained, they propagate at speeds slightly higher than √2–c_s . The experimental results compare well with existing asymptotic theories of intersonic crack growth, and the significance of the preferred speed of √2–c _ is discussed.
Item Type: | Article | ||||||
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Additional Information: | © Springer-Verlag Berlin Heidelberg 2000. Received: 13 September 1999 / Reviewed and occerted: 19 November 1999 | ||||||
Group: | GALCIT | ||||||
Subject Keywords: | Intersonic fracture · Shear cracks · Crack propagation · Shear shock waves · Limiting speeds · Photoelasticity · Dynamic contact | ||||||
Issue or Number: | 4 | ||||||
DOI: | 10.1007/s100190050009 | ||||||
Record Number: | CaltechAUTHORS:20190930-110457541 | ||||||
Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20190930-110457541 | ||||||
Official Citation: | Rosakis, A., Samudrala, O. & Coker, D. Mat Res Innovat (2000) 3: 236. https://doi.org/10.1007/s100190050009 | ||||||
Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||
ID Code: | 98929 | ||||||
Collection: | CaltechAUTHORS | ||||||
Deposited By: | George Porter | ||||||
Deposited On: | 30 Sep 2019 19:59 | ||||||
Last Modified: | 16 Nov 2021 17:42 |
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