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Attenuation of strain waves in core samples of three types of rock

Birefringent strips bonded to rock-core samples are utilized in conjunction with dynamic photoelasticity to determine attenuation coefficients, rod velocities and dynamic moduli for three rock types

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Abstract

Dynamic photoelasticity was employed to determine the velocity of longitudinal stress waves, dynamic modulus of elasticity and attenuation coefficients in rockcore samples 1 in. (25 mm) in diameter, 18 in. (0.46 m) long. Birefringent strips bonded to the core samples of Salem limestone, Charcoal granite and Berea sandstone provided all the data needed for the dynamic characterization of these rock types.

The rods were dynamically loaded at one end with a lead-azide charge. A multiple-spark-gap camer was used to record the dynamic isochromatic-fringe patterns occurring in the birefringent strip.

Of the three rock types investigated, the Berea sandstone exhibited the largest energy losses as characterized by an attenuation coefficient of 0.0910. Salem limestone and Charcoal granite exhibited much smaller losses with attenuation coefficients of 0.0196 and 0.0024, respectively. The extremely low-energy loss associated with Charcoal granite indicates that this material transmits stress waves as well as most metals.

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Authors and Affiliations

  1. Dept. of Mechanical Engineering, University of Maryland, College Park, MD

    W. L. Fourney (Professor), J. W. Dally (Professor) & D. C. Holloway (Associate Professor)

Authors
  1. W. L. Fourney
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  2. J. W. Dally
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  3. D. C. Holloway
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Fourney, W.L., Dally, J.W. & Holloway, D.C. Attenuation of strain waves in core samples of three types of rock. Experimental Mechanics 16, 121–126 (1976). https://doi.org/10.1007/BF02321105

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  • DOI: https://doi.org/10.1007/BF02321105

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