Measuring and testing – Fluid pressure gauge – Diaphragm
Patent
1996-11-12
1998-08-04
Dombroske, George M.
Measuring and testing
Fluid pressure gauge
Diaphragm
73786, G01N 1908, G01N 2904
Patent
active
057896801
ABSTRACT:
A sacrificial specimen for use in monitoring fatigue damage of a structural member including a main body made of the same material of the structural member and having an artificially formed crack at a central region thereof, and first and second thin epoxy resin plates cemented to both surfaces of the main body by an epoxy resin adhesive agent except for the central region. The main body is made by a thin metal plate having a thickness of 0.25 mm. In order to keep the central region of the main body free from the adhesive agent, a synthetic resin film is wound around the central region of the main body. The sacrificial specimen is secured to a surface of the structural member by means of an epoxy resin adhesive agent. A condition of fatigue crack growth at the artificially formed crack is monitored by a microscope, and fatigue crack of the structural member can be predicted from the monitored condition.
REFERENCES:
patent: 3979949 (1976-09-01), Smith
patent: 4107980 (1978-08-01), Crane et al.
patent: 4164874 (1979-08-01), Cassatt et al.
patent: 4255974 (1981-03-01), Dufrane et al.
patent: 5520055 (1996-05-01), Fussinger
Dombroske George M.
Hiroshima University
Noori Max H.
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