Applicability of the Kryptonate (Trade name) Technique to the Prediction of Useful Fatigue Life
Abstract
The behavior during stress cycling of a Kryptonate, prepared from aluminum alloy 7075-T6 fatigue specimens, was studied. Kryptonates are solids into the surface of which the radioisotope, Kr85, has been stably incorporated. They release Kr85 at a rate dependent upon the rate at which the surface is disturbed either physically or chemically. Their preparation and properties are discussed. Efforts to determine whether the release rate of Kr85 from a fatigue specimen would be a predictor of remaining fatigue life are reported. Other properties of krypton impregnated specimens, such as high sensitivity to chemical attack and Kr85 thermal release behavior were investigated in relation to the fatigue process. A correlation was found between the onset temperature of Kr85 thermal release and the extent of previous stress cycling. The validity of a fatigue life test based upon Kr85 loss behavior from aluminum alloy 7075-T6 fatigue specimens was established negatively.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1970
- Accession Number
- AD0866793
Entities
People
- Philip Goodman