Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Specified electrical sensor or system
Patent
1977-10-31
1979-04-17
Ciarlante, Anthony V.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Specified electrical sensor or system
73799, G01N 324
Patent
active
041494067
ABSTRACT:
A method of, and apparatus for, determining the time dependency of the length of a fissure in a test specimen during a fracture test which comprises securing an electrically conductive, areal or surface-like element to the test specimen such that during the fracture test it tears at the region of the fissure. An electrical parameter, such as the electrical resistance is determined between two measuring locations of the element. The measuring locations are selected such that the measurement current between such measuring locations passes through the region of the fissure. The element which is employed has a compact measuring section which is free of openings and the element is secured at the test specimen in such a manner that the measuring section completely covers the surface region which is occupied, during the fracture test, by the fissure until the end of the measurement of the length of the fissure, so that the resistance substantially uniformly increases with the length of the fissure.
REFERENCES:
patent: 3136154 (1964-06-01), Christensen
patent: 3596269 (1971-07-01), Laska
Ciarlante Anthony V.
Kleeman Werner W.
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