Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1992-02-20
1993-04-06
Williams, Hezron E.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
G01L 1024
Patent
active
051993040
ABSTRACT:
A technique for in a thermo-dynamic material testing system for optically measuring changes in specimen size that occur during material testing. Specifically, a pair of jaws, one movable and one fixed, engage opposite ends of the test specimen and are controllably moved with respect to each other in order to impart a desired tensile or compressive force to the specimen. A fixed light source emits a planar light beam, typically collimated laser radiation, that is directed at the specimen by two mirrors mounted to the jaws and on one side of the specimen. One of these mirrors is secured to and moves with the moving jaw and directs the light beam toward the specimen along a transverse path; the other mirror is mounted to the fixed jaw. A fixed light receiver receives the light beam after it has passed over the specimen and has been reflected by a similar pair of mirrors mounted to the jaws but on the other side of the specimen. Changes in the positional profile of the light beam caused by specimen deformation are detected by the receiver and converted into physical measurements of deformation and deformation rate.
REFERENCES:
patent: 4129384 (1978-12-01), Walker et al.
patent: 4836031 (1989-06-01), Jatho et al.
patent: 4962669 (1990-10-01), Gernhart et al.
"Electro-optical Position-Measuring System", NASA Tech Briefs, Jan. 1991, p. 26.
Descriptive Advertising Sheet for "Thermecmastor Z" Induction Heated in Thermo-dynamic Material Testing System from Fuji Denpa Koki KK (Japanese).
Ashraf Nashmiya N.
Duffers Scientific, Inc.
Michaelson Peter L.
Williams Hezron E.
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