Measuring and testing – Vibration – Resonance – frequency – or amplitude study
Patent
1985-06-20
1986-07-29
Kreitman, Stephen A.
Measuring and testing
Vibration
Resonance, frequency, or amplitude study
73597, G01N 2900
Patent
active
046025111
ABSTRACT:
A method and apparatus for measuring tensile stress in a fastener already in place. This method capitalizes on the discovery that a longitudinal wave will travel roughly twice as fast as a transverse wave and the times-of-flight of the two waves are affected to different degrees by tensile stress. Longitudinal and transverse ultrasonic signals are applied to a first end of the fastener. The longitudinal and transverse signals are detected at this same first end of the fastener after they are reflected off of the second end of the fastener. The time-of-flight for each of the longitudinal and transverse waves is measured. The tensile stress, T, in the fastener is then determined by applying substantially the following equation: ##EQU1## where v.sub.10 and v.sub.20 =the velocities of the longitudinal and transverse signals, respectively, in a similar fastener not under stress;
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patent: 4363242 (1982-12-01), Heyman
J. A. Green Company
Kreitman Stephen A.
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