Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Indicating coating or sheet providing direct visual indication
Patent
1980-12-30
1983-10-18
Kreitman, Stephen A.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Indicating coating or sheet providing direct visual indication
73810, 73760, 73799, 116212, G01B 1120, G01N 300, G01N 1900, G01L 500
Patent
active
044098413
ABSTRACT:
A fatigue damage indicator includes a thin plate mounted between or integral with two members to which a stress is to be applied, the disposition of the two members being such that the thin plate is stressed in shear.
Slots extending in the direction of the applied stress may be provided to ensure that cracks formed by fatigue stress propagate in a desired direction and the crack propagation is designed to ensure that a part of the plate becomes detached or is bent substantially away.
REFERENCES:
patent: 2920480 (1960-01-01), Haas
patent: 3244137 (1966-04-01), Garvey
patent: 3572091 (1971-03-01), McFarland
patent: 3774443 (1973-11-01), Green et al.
patent: 3786679 (1974-01-01), Crites
patent: 3994598 (1976-11-01), Reytblatt
patent: 4107980 (1978-08-01), Crane et al.
patent: 4164874 (1979-08-01), Cassatt et al.
patent: 4278043 (1981-07-01), Heath
patent: 4322981 (1982-04-01), Radwill
Measurement of Crack Growth in a Notch; by Nicholson, Journal of Physics E: Scientific Instruments, vol. 7, 1974, pp. 741-743.
Strength Testing with Fatigue Crack; by Neshpor et al., Ind. Lab, (USA) vol. 43, No. 1, Jan. 1977 from Zauodskaya Laboratorya.
Notched Strip Shows Fatigue Damage, Jul. 1981 of Machine Design.
Structural Evolution During Fatigue, by Guy Henry and Dietrich Horstmann, Max-Planck Inst. (Date Unknown).
A Surface-Coating Technique for Monitoring Stress . . . Cracks, by Sorel, NDI International, Oct. 1981, pp. 281-284.
Fatigue Crack Propagation from Crack Arrays, by Shaw, W. J. D. and Le May, I., Univ. of Saskat. 15th Inter. Conf. at Cannes, 1981.
Carlson David V.
Dubno Herbert
Kreitman Stephen A.
Ross Karl F.
Societe Anonyme: Stas Societe Technique d'Accessories Specialise
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