Measurement of Surface Stress via the Moessbauer Effect.
Final rept. 15 Jun 69-15 Jun 71,
AUSTIN SCIENCE ASSOCIATES INC TEX
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The feasibility of applying Mossbauer spectroscopy to non-destructive measurement of surface stresses in ferrous metals was examined. The concept is based on the small changes in Mossbauer spectra of ferrous metals under stress. The concept was first proved using the well-developed transmission geometry technique. The transition to back-scatter, which is essential for general use of the technique, called for a major effort for detector development. The effort finally paid off, with signalnoise per unit time fully 90 as good as is obtained in transmission. Further hard-ware development is required for a fully operational instrument, and there remain theoretical problems bearing on changes of steel alloy composition, the effects of surface roughness, and the stress distribution vs. depth. Author
- Test Facilities, Equipment and Methods