Surface Stress Measurement with the Mossbauer Effect.
Abstract
An instrument has been conceived, designed, constructed, and tested for the non-destructive measurement of residual surface stresses in ferrous metals, based on the Mossbauer effect. Stress influences the Mossbauer effect on a fundamental level--the atomic wave functions are compressed or expanded and so shift the energy at which resonance occurs. Instrumentation capable of this measurement has been difficult of attainment. Because of the nature of the samples to be analyzed, it was essential that backscatter detectors be developed. A thermal-scanning technique was developed to vary the gamma-ray energy with the precision needed. It was also necessary to measure the percentage Mossbauer effect on the sample under study, and the concept evolved of spoiling the resonance during temperature changes of the source. The low signal/noise required that data be accumulated over several hours, and computer-aided data reduction was essential. Precision achieved is currently a few KSI.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1974
- Accession Number
- ADA005581
Entities
People
- C. M. Yagnik
- R. A. Mazak
- R. L. Collins