Method and apparatus for determining material fatigue by measuri

Details Method and apparatus for determining material fatigue by measuri Method and apparatus for determining material fatigue by measuri

1993-03-03

1995-12-19

Chilcot, Richard

Measuring and testing

Vibration

Resonance, frequency, or amplitude study

73808, 73811, G01N 2904

Patent

active

054760097

ABSTRACT:
The fatigue integrity of metallic materials may be determined by either one of two methods. In a first method, an impulse of energy is introduced into the metallic material, such as by striking the metallic material, and the induced vibration is sensed and analyzed in order to compute the damping factor thereof, the damping factor being directly related to the fatigue thereof. With this method, a transducer is coupled to the metallic material and its output is amplified by an amplifier before input to a computer which determines the damping factor. In a second method, a continuous energy input is provided to the metallic material, such as by utilizing a frequency generator coupled to a power amplifier whose output drives a transducer such as a speaker or the like for inducing a continuous vibration in the metallic material. This continuous vibration is measured with a transducer, an amplifier, and a damping factor calculated with a computer as in the first method.

REFERENCES:
patent: 3106838 (1963-10-01), Crooks
patent: 3153338 (1964-10-01), Kleesattel
patent: 3531982 (1970-10-01), Clotfelter et al.
patent: 3857279 (1974-12-01), Salzer
patent: 4064745 (1977-12-01), Gaddum
patent: 4542639 (1985-09-01), Cawley
patent: 5305645 (1994-04-01), Reifsnider et al.
The American Society of Mechanical Engineering paper entitled Structural Damping, presented at a colloquium on structural damping held at the ASME annual meeting, pp. 1-34, Dec. 1959.
Calcified Tissue International article entitled Material Damping for Monitoring of Density and Strength of Bones, by Andrew D. Dimarogonas et al., 1993, 52:244-247.

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