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Split-hopkinson-bar tests on rock under confining pressure

Description of apparatus and test results is given. Attention is given to complete measurement of principal strain and resolution of initial stress-strain data

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Abstract

The effect of dynamic loading on the stress-strain and failure characteristics of nugget sandstone was investigated at strain rates from 102 to 103 per second and confining pressures to 30 ksi. The apparatus developed for these experiments consists of a conventional split Hopkinson bar enclosed in a pressure vessel. The apparatus permitted determination and recording of all principal stresses and strains from the onset of loading to failure. A description of the experimental techniques used in obtaining data including the method of determining stress and strain, the method of reducing data, and use of various shaped projectiles to tailor the input-stress wave are reported together with experimental results for nugget sandstone. All rocks tested exhibited an increase in strength as the loading rate increased. The dynamic stress-strain curves were similar in shape to curves from quasi-static testing of the same material.

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Authors and Affiliations

  1. College of Engineering, University of Utah, 84112, Salt Lake City, Utah

    R. J. Christensen (Research Assistant), S. R. Swanson (Assistant Research Professor) & W. S. Brown (Professor of Mechanical Engineering)

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  1. R. J. Christensen
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  2. S. R. Swanson
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  3. W. S. Brown
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Christensen, R.J., Swanson, S.R. & Brown, W.S. Split-hopkinson-bar tests on rock under confining pressure. Experimental Mechanics 12, 508–513 (1972). https://doi.org/10.1007/BF02320747

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  • DOI: https://doi.org/10.1007/BF02320747

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