Holographic Study of Rock Specimens Under Uniaxial and Triaxial Loads

Abstract

Double-exposure holographic interferometry was used to measure the radial and axial displacement profiles over the surface of cylindrical specimens of rock placed under uniaxial and triaxial loads. The rock specimens tested were Mixed Company Sandstone and Lithographic Limestone. The axial loads used in the tests were in the range of 1000 psi to 1600 psi. The hydrostatic pressure for the triaxial test was 4000 psi. Strain distributions were calculated and comparisons were made between the measured total axial strain on the Mixed Company Sandstone specimens and results obtained using conventional strain gauge techniques. A special test pressure vessel was built with a viewing port to accommodate the use of holographic interferometry to measure the surface response of the sandstone specimen during the triaxial test.

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Document Details

Document Type
Technical Report
Publication Date
Aug 09, 1974
Accession Number
AD0784433

Entities

People

  • J. D. O'keefe
  • J. L. Schmidt
  • T. J. Ahrens

Tags

Communities of Interest

  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Accuracy
  • Axial Loads
  • Cameras
  • Data Reduction
  • Films
  • Gages
  • Geometry
  • Holograms
  • Hydrostatic Pressure
  • Load Cells
  • Measurement
  • Optics
  • Photographic Plates
  • Photographs
  • Pressure Vessels
  • Refractive Index
  • Strain Gages

Fields of Study

  • Physics

Readers

  • Fluid Dynamics.
  • Geotechnical Engineering.
  • Materials Science (Mechanical Engineering).