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Mechanical properties of shock-damaged rocks

He, Hongliang and Ahrens, T. J. (1994) Mechanical properties of shock-damaged rocks. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts, 31 (5). pp. 525-533. ISSN 0148-9062.

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Stress-strain tests were performed both on shock-damaged gabbro and limestone. The effective Young's modulus decreases with increasing initial damage parameter value, and an apparent work-softening process occurs prior to failure. To further characterize shock-induced microcracks, the longitudinal elastic wave velocity behavior of shock-damaged gabbro in the direction of compression up to failure was measured using an acoustic transmission technique under uniaxial loading. A dramatic increase of velocity was observed for the static compressive stress range of 0–50 MPa. Above that stress range, the velocity behavior of lightly damaged (D_0<0.1) gabbro is almost equal to unshocked gabbro. The failure strength of heavily damaged (D_0>0.1) gabbro is ∼100−150 MPa, much lower than that of lightly damaged and unshocked gabbros (∼230−260 MPa). Following Nur's theory, the crack shape distribution was analyzed. The shock-induced cracks in gabbro appears to be largely thin penny-shaped cracks with c/a values below 5 × 10^(−4). Moreover, the applicability of Ashby and Sammis's theory relating failure strength and damage parameter of shock-damaged rocks was examined and was found to yield a good estimate of the relation of shock-induced deficit in elastic modulus with the deficit in compressive strength.

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Additional Information:© 1994 Elsevier Science Ltd. Accepted for publication 28 October 1993. We would like to express our thanks to Dr Weinong Chen for his assistance in the stress-strain measurements. This research was supported by AFOSR and NASA. Contribution 5299, Division of Geological and Planetary Sciences.
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Air Force Office of Scientific Research (AFOSR)UNSPECIFIED
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Caltech Division of Geological and Planetary Sciences5299
Issue or Number:5
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Official Citation:Hongliang, H., & Ahrens, T. J. (1994). Mechanical properties of shock-damaged rocks. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 31(5), 525-533. doi:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50851
Deposited By: Joanne McCole
Deposited On:27 Oct 2014 19:17
Last Modified:03 Oct 2019 07:27

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