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Strain and creep measurements on rocks by halographic interferometry

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Summary

A technique is described for measuring strains in rock deformation experiments by means of holographic interferometry. The method allows the entire surface displacement field of the sample to be mapped to within one-tenth the wavelength of light. Several illustrative experiments show that inhomogeneous strain, in particular bending and torsion, is commonly present in uniaxial compression experiments, and that some of this strain can be caused by the testing machine. In a creep experiment in uniaxia compression, a concentration of dilatancy was observed very early in the experiment that was spatially related to the location of the ultimate failure plane.

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References

  1. E. R. Robertson andJ. M. Harvey (eds.),The Engineering Uses of Holography (Cambridge University Press 1970).

  2. L. O. Heflinger, R. F. Wuerker andH. Spetzler,Thermal expansion coefficient measurement of diffusely reflecting samples by holographic interferometry, Rev. Sci. Instrum 44 (5), May 1973.

  3. H. Spetzler, L. O. Heflinger andR. F. Wuerker,Thermal expansion coefficient measurements of specularly reflecting samples, Rev. Sci. Instrum. 44 (5), May 1973.

  4. M. D. Meyer andH. A. Spetzler,Material properties and strain determination using CIV holographic interferometry (submitted to J. Experimental Mechanics (1974)).

  5. C. H. Scholz,Static fatigue of quartz, J. Geophys. Res. 77 (11), April 10, 1972.

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Author notes

  1. Hartmut Spetzler

    Present address: Cooperative Institute for Research in Environmental Sciences, University of Colorado, 80302, Boulder, Colorado

  2. Chi-Ping J. Lu

    Present address: Chinese Earthquake Research Center, P.O. Box 58937, Taipei, Taiwan, ROC

Authors and Affiliations

  1. Sandia Laboratories, 94550, Livermore, California

    Hartmut Spetzler

  2. Lamont-Doherty Geological Observatory, 10964, Palisades, New York

    C. H. Scholz

  3. State University of New York, 10964, Binghamton, New York

    Chi-Ping J. Lu

Authors
  1. Hartmut Spetzler
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  2. C. H. Scholz
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  3. Chi-Ping J. Lu
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Spetzler, H., Scholz, C.H. & Lu, CP.J. Strain and creep measurements on rocks by halographic interferometry. PAGEOPH 112, 571–581 (1974). https://doi.org/10.1007/BF00877294

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  • DOI: https://doi.org/10.1007/BF00877294

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