NONDESTRUCTIVE EVALUATION OF METAL FATIGUE.
Scientific rept. for 1966-1967,
SOUTHWEST RESEARCH INST SAN ANTONIO TEX DEPT OF INSTRUMENTATION RESEARCH
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The purposes of this program were threefold to design and fabricate a vacuum chamber such that specimens can be stress cycled and nondestructively monitored while in a controlled atmosphere to develop electric current equipment for nondestructive evaluation of fatigue in nonferromagnetic metals under controlled atmosphere and to modify existing ultrasonic and magnetic perturbation equipments such that nondestructive evaluations can be conducted in a controlled atmosphere using these techniques to stress cycle specimens and conduct nondestructive evaluations of fatigue damage in these specimens. Photographs of the fatigue damage evaluation facility are shown including the vacuum chamber and associated equipment. Features and capabilities of the vacuum system are discussed. A description of the electric current nondestructive evaluation apparatus is given including photographs and a discussion of the technique. Modification of existing ultrasonic surface wave and magnetic perturbation equipments so that they can be used for fatigue damage evaluation in a vacuum are also described. Fatigue evaluation experiments on a steel specimen stress cycled in the laboratory ambient atmosphere are described. The results obtained utilizing the ultrasonic and magnetic nondestructive monitoring instrumentation are presented. Author
- Metallurgy and Metallography
- Test Facilities, Equipment and Methods