Stress relaxation behind elastic shock waves in rocks
- Creators
- Ahrens, Thomas J.
- Duvall, George E.
Abstract
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.
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.Attached Files
Published - jgr4991.pdf
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Additional details
- Eprint ID
- 51489
- Resolver ID
- CaltechAUTHORS:20141110-092500399
- DA-49-146-XZ-277
- Defense Atomic Support Agency (DASA)
- Advanced Research Projects Agency (ARPA), project Vela
- Created
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2014-11-10Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field