Method and apparatus for non-destructive evaluation utilizing th

Details Method and apparatus for non-destructive evaluation utilizing th Method and apparatus for non-destructive evaluation utilizing th

1978-08-11

1980-11-04

Kreitman, Stephen A.

Measuring and testing

Vibration

By mechanical waves

73588, G01N 2900

Patent

active

042312590

ABSTRACT:
A non-destructive evaluation technique particularly suited for in situ testing utilizes significant changes in internal friction damping (IFD) as an indicating factor. A baseline for the specific damping capacity of an object is determined and a tolerance range is established from the baseline. Measurements of the specific damping capacity are periodically made and checked to see if they are within the tolerance range. Unexpected changes in specific damping capacity indicate the presence of an incipient flaw in the object. The evaluation technique can also be used to locate flaws, monitor crack growth and predict useful life. Apparatus for measuring specific damping capacity is also disclosed.

REFERENCES:
patent: 3345861 (1967-10-01), Heath
patent: 3453872 (1969-07-01), Botsco
patent: 3564903 (1971-02-01), Woodmansee et al.
patent: 3592050 (1971-07-01), Nutt et al.
patent: 3623358 (1971-11-01), Sugimoto
patent: 4128011 (1978-12-01), Savage

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