Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1988-04-21
1989-06-27
Levy, Stewart J.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
G01N 308
Patent
active
048417793
ABSTRACT:
A tension tester in which a specimen marked with at least one measuring marking whose optical characteristic is different from that of the specimen's ground color is held by chucks at the ends and subjected to a tensile load by moving one of the chucks; in which, while the specimen is being stretched, the marking is scanned by a scanner to detect a positional change of the marking in the tensile direction; and in which electric signals which are produced due to the difference in the optical characteristic between the marking and the specimen's ground color are processed to determine the tensile characteristic of the specimen. In this tension tester, the scanner consists of a first scanner with its field of view set to the entire elongation range of the specimen; and at least one second scanner having its field of view set only to a low elongation range of the specimen, the second scanner either having a greater number of elements than the first scanner or being adapted to perform a magnified scanning with greater magnification than that of the first scanner.
REFERENCES:
patent: 4031746 (1977-06-01), Furuta et al.
patent: 4112746 (1978-09-01), Itoh et al.
patent: 4572001 (1986-02-01), Saimoto et al.
Mitsuhashi Kenhachi
Nakayama Shohei
Ohashi Yoshinobu
Yamada Akira
Levy Stewart J.
Simons Michele
The Yokohama Rubber Co. Ltd.
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