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Measurement of Cumulative Fatigue Damage by X-Ray Double-Crystal and Scanning Diffraction Methods

Published online by Cambridge University Press:  06 March 2019

R. N. Pangborn ,
S. Weissmann  and
L. R. Kramer
R. N. Pangborn
Affiliation:
The Pennsylvania State University, University Park, PA
S. Weissmann
Affiliation:
Rutgers University, P. O. Box 909, Piscataway, NJ
L. R. Kramer
Affiliation:
David W. Taylor Naval Ship R & D Center, Annapolis, MD
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The ability to predict fatigue failure has long eluded scientists and engineers. Because they can be applied nondestructively, X-ray diffraction methods have been employed to measure fatigue induced lattice misorientation, lattice strain, residual stress and subgrain formation. The changes in the X-ray patterns, however, were found to be restricted principally to the very early and late fractions of the fatigue life. Their invariance during the intermediate portion of the life has hampered the evaluation of cumulative fatigue damage and prediction of ultimate failure.

The primary difference between previous investigations and our recent X-ray diffraction studies is the emphasis we placed on characterizing both the surface and subsurface response to fatigue. By evaluating the prefracture damage with depth from the specimen surface a more reliable procedure for failure estimation emerged.

Type
Research Article
Information
Advances in X-Ray Analysis , Volume 24: Twenty-Ninth Annual Conference on Applications of X-ray Analysis, August 4-8, 1980 , 1980 , pp. 203 - 208
Copyright
Copyright © International Centre for Diffraction Data 1980

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References

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