Gauge for measuring the mouth opening displacement of fracture toughness test specimens
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United States of America Patent
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-
Sep 15, 1981
Grant Date -
N/A
app pub date -
Mar 24, 1980
filing date -
Mar 24, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The gauge of the present invention consists of a three-pronged spring clip for arrangement between the grips of a conventional grip-loading fracture specimen loading machine, which grips are inserted into the mouth of a standard slotted fracture toughness test specimen, the gauge to monitor the specimen mouth opening displacement thereof during a test for fracture toughness. The spring clip preferably is formed from a single sheet of material that is bent appropriately to produce two aligned legs or prongs with a center leg or prong there between. In operation the outside prongs are essentially stationary while the center prong is arranged to flex with respect to grip movement apart, which center movement is sensed electrically by a strain gauge secured thereto at its point of bending.
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