Residual stress measurement at fastener holes

Details Residual stress measurement at fastener holes Residual stress measurement at fastener holes

1992-04-27

1994-03-29

Chapman, John E.

Measuring and testing

Vibration

By mechanical waves

29407, 29705, G01N 2918

Patent

active

052974359

ABSTRACT:
A system is employed for measuring the changes in velocity of ultrasonic waves in structural members as a result of variations in local elastic stresses about fastener holes. In a first embodiment, piezoelectric transducer and detector members are employed while in a second embodiment non-contacting laser transducer and detector components are used. The invention is capable of detecting the establishment of optimum cold working around a fastener hole by monitoring the velocity of ultrasonic waves in the structural material. This ensures maximized useful life of the structural member by avoiding over or under worked fastener holes.

REFERENCES:
patent: 4363242 (1982-12-01), Heyman
patent: 4953973 (1990-09-01), Leftheris et al.
patent: 5176033 (1993-01-01), Jones et al.

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