THIN DISK TECHNIQUE FOR ANALYZING ROCK FRACTURES INDUCED BY LASER IRRADIATION

The report presents results to date in the study 'Laser Assisted Rock Fracture.' Thin disc samples of marble and granite have been irradiated for short intervals with unfocused 10.6 micron (infrared) radiation from a carbon dioxide-nitrogen-helium gas laser. The specimens were exposed to laser radiation of different power levels over various areas of one side. Thermo-sensitive paints applied to the face indicated the radial temperature distribution across the specimen, and the initiation of the crack was detected using electrically conductive silver paints on the other face. Good agreement was found between the experimental data obtained from the temperature at failure and the calculated thermal stresses developed in the specimens. The results indicated that failure occurred when the induced thermal stresses exceeded the tensile strength of the rock. (Author)

• Corporate Authors:

  Massachusetts Institute of Technology

  Department of Civil Engineering, 77 Massachusetts Avenue
  Cambridge, MA  United States  02139
• Authors:
  • Moavenzadeh, F
  • Williamson, R B
  • McGarry, F J
• Publication Date: 1968-5

Media Info

• Pagination: 91 p.

Subject/Index Terms

• TRT Terms: Excavating equipment; Intelligent transportation systems; Mining; Tunnels
• Old TRIS Terms: Advanced systems
• Subject Areas: Bridges and other structures; Operations and Traffic Management; Railroads;

Filing Info

• Accession Number: 00039113
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: R68-21 Res Rpt, DSR-76103
• Contract Numbers: C-85-65t
• Files: TRIS
• Created Date: Nov 24 1973 12:00AM