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Stress relaxation behind elastic shock waves in rocks

Ahrens, Thomas J. and Duvall, George E. (1966) Stress relaxation behind elastic shock waves in rocks. Journal of Geophysical Research, 71 (18). pp. 4349-4360. ISSN 0148-0227. doi:10.1029/JZ071i018p04349.

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The amplitude of elastic shock waves in Arkansas novaculite is observed to decrease at a rate of ≈3.3 kb/mm for shock propagation path lengths of 6 to 12 mm. The amplitude of the final shock state in the experiments is held near the 155-kb pressure level. A total variation of elastic shock wave amplitude (Hugoniot elastic limit) of ≈40 kb (from 110 to 70 kb) is observed in ≈1 cm of shock travel. The intrinsic attenuation term in a constitutive equation for a stress-relaxing elastoplastic material is found to account for ≈90% of the observed peak pressure attenuation of the elastic shock, as compared with the ≈10% which is predicted from the instantaneous elastic shock profile. The Hugoniot elastic limits of Sioux and Eureka quartzites, which were not as intensively studied as the Arkansas novaculite, are also found to decrease with shock propagation path length.

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Additional Information:Copyright 1966 by the American Geophysical Union. (Manuscript received March 7, 1966.) We appreciate the assistance of M. Ruderman, W. Isbell, and M. White with the experiments. We are also grateful for the scientific discussions and thoughtful criticisms of the manuscript provided by Drs. G. R. Fowles and D. G. Doran. This research was supported in part through the Defense Atomic Support Agency, contract DA-49-146-XZ-277, as part of the Advanced Research Projects Agency's Vela Uniform program.
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Defense Atomic Support Agency (DASA)DA-49-146-XZ-277
Advanced Research Projects Agency (ARPA), project VelaUNSPECIFIED
Issue or Number:18
Record Number:CaltechAUTHORS:20141110-092500399
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Official Citation:Ahrens, T. J., and G. E. Duvall (1966), Stress relaxation behind elastic shock waves in rocks, J. Geophys. Res., 71(18), 4349–4360, doi:10.1029/JZ071i018p04349.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51489
Deposited By: George Porter
Deposited On:10 Nov 2014 17:35
Last Modified:10 Nov 2021 19:11

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