A series of Brazilian tests on solid disks of Green River Formation oil shale is cited. Two cases were considered: disks with faces parallel to the bedding plane and disk with bedding planes perpendicular to the disk faces, with varying inclinations to the load axis. Maximum tensile strength occurred when the angle of inclination was 30 degrees, and the tensile strength at 0 degrees was the same as at 90 degrees. In reply, the authors note that testing at angles other than 90 degrees will have a failure mode that, depending on the deviation from 90 degrees, is due primarily to sliding between layers: a shear failure rather than tensile failure. The corresponding result is, therefore, a measure of shear strength rather than of tension. The results at 0 degrees are really testing the adhesion between two particular layers along the loading plane, and thus are not meaningful as an average ultimate tensile strength.

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  • Accession Number: 00314627
  • Record Type: Publication
  • Report/Paper Numbers: ASCE 14567
  • Files: TRIS
  • Created Date: Oct 8 1980 12:00AM