Dynamic Tensile Failure in Rocks
Semiannual technical rept. no. 1, 12 Feb-31 Aug 1971
STANFORD RESEARCH INST MENLO PARK CA
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Dynamic tensile failure in rocks is being studied through flatplate impact experiments using a gas gun and ytterbium stress gages. Six gas gun experiments have been performed on novaculite with successful specimen recovery. The stress history at the specimen-plexiglass interface has been recorded with an ytterbium stress gage. The record is in agreement with a computer-predicted profile. The virgin novaculite and the recovered specimens have been examined by optical microscopy. Spall cracks tend to be large and few in number. Fracture proceeds intergranularly. The tensile strength of 27 specimens of novaculite was measured in the expanded ring test hoop-stress loading to be 6, 400 plus or minus 440 psi.
- Geology, Geochemistry and Mineralogy