Dynamic Tensile Failure in Rocks

Abstract

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.

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Document Details

Document Type
Technical Report
Publication Date
Sep 24, 1971
Accession Number
AD0731417

Entities

People

  • Carl F. Petersen
  • Donald A. Shockey

Organizations

  • SRI International

Tags

Communities of Interest

  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Boundaries
  • Electron Microscopes
  • Electron Microscopy
  • Failure Mode And Effect Analysis
  • Gas Guns
  • Grain Boundaries
  • Grain Size
  • Materials
  • Measurement
  • Microscopes
  • Microscopy
  • Microstructure
  • Scanning Electron Microscopes
  • Scanning Electron Microscopy
  • Security
  • Tensile Strength
  • Tensile Stress

Readers

  • Materials Science (Mechanical Engineering).
  • Mechanical Engineering/Mechanics of Materials.