EXTENSION OF SURVIVAL RANGE FOR DIFFRACTION GRATING STRAIN GAGES

Diffraction grating strain gages cease to function when the surface is so roughened with strain that the gages no longer respond as coherent diffraction sources. A method is described by which the range of strains over which gages may be used, is extended significantly. This method requires incident radiation in a grazing-parallel attitude rather than the attitude normally employed in studying diffraction. A new diffraction equation is derived as are the equations which are necessary to calculate strain from an experimental configuration. The required changes to an existing test facility are discussed. Results obtained using this modified system demonstrate the improved range of the diffraction strain gage under dynamic straining.

• Corporate Authors:

  North Carolina State University, Raleigh

  Raleigh, NC  United States  27695
• Authors:
  • Steele, R S
  • DOUGLAS, R A
  • Stadelmaier, H H
• Publication Date: 1970-10

Media Info

• Features: References;
• Pagination: 23 p.

Subject/Index Terms

• TRT Terms: Diffraction; Plasticity; Strain gages; Structural analysis
• Subject Areas: Marine Transportation; Materials;

Filing Info

• Accession Number: 00025596
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: 70-7 Tech Rpt
• Contract Numbers: N00014-68-A-0187
• Files: TRIS
• Created Date: Feb 4 1973 12:00AM