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Intersonic shear crack growth along weak planes

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.

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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
Related URLs:
URLURL TypeDescription
Rosakis, Ares J.0000-0003-0559-0794
Coker, Demirkan0000-0001-7385-7089
Additional Information:© Springer-Verlag Berlin Heidelberg 2000. Received: 13 September 1999 / Reviewed and occerted: 19 November 1999
Subject Keywords:Intersonic fracture · Shear cracks · Crack propagation · Shear shock waves · Limiting speeds · Photoelasticity · Dynamic contact
Issue or Number:4
Record Number:CaltechAUTHORS:20190930-110457541
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Official Citation:Rosakis, A., Samudrala, O. & Coker, D. Mat Res Innovat (2000) 3: 236.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:98929
Deposited By: George Porter
Deposited On:30 Sep 2019 19:59
Last Modified:16 Nov 2021 17:42

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