Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1987-08-18
1988-08-16
Levy, Stewart J.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
73851, 738656, G01N 320
Patent
active
047635290
ABSTRACT:
Method and apparatus for static fatigue testing of ceramic material is described wherein a thin plate of ceramic material is supported at opposite ends thereof in a liquid sodium bath inside an enclosure containing a gaseous atmosphere inert to reaction with liquid sodium, the ceramic plate and sodium bath are controllably heated to preselected temperature, known loads are applied to the ceramic plate through a loading head having a pair of contact points on the ceramic plate intermediate its opposite ends within the sodium bath, and displacements of the loading head at corresponding loads are measured to generate output signals characteristic of loads on the ceramic plate.
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patent: 4266424 (1981-05-01), Muensted
patent: 4578325 (1986-03-01), Gatou et al.
patent: 4711131 (1987-12-01), Hopkins
Acquaviva, "A Method for Fatigue Testing of Ceramic Materials", Review of Scientific Instruments, vol. 42, No. 12, Dec. 1971.
Koning, "A Specimen for a Constant Stress Intensity Factor", Engineering Fracture Mechanics, vol. 9, pp. 331-340, 1977.
A. C. Gonzalez et al, "Fatigue Properties of Ceramics with Natural and Controlled Flaws: A Study on Alumina", ASTM STP 844:45-56(1984).
Allen Douglas M.
Leonard John F.
Levy Stewart J.
Raevis Robert R.
Scearce Bobby D.
Singer Donald J.
The United States of America as represented by the Secretary of
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