4. Choice of sensor gauges
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The metal of the gauges must be chosen according to various criteria such as, among others:
temperature range of use: e.g. 200°C maximum for constantan, 300°C maximum for Nichrome, etc. ;
expansion of the test body (gauges are self-compensating, e.g. for steel, bronze, etc.);
the variation of the gauge factor K with temperature to compensate for the variation of the modulus of elasticity E of the test body;
the elastic limit or fatigue limit of the test body.
Gauges of the same metal form a family. The manufacturers present various families with special properties, as well as the bonding and protective products recommended for the various applications.
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Choice of sensor gauges
Thermal compensation circuits
Bibliography
Theses
- - http://www.sudoc.abes.fr
- PY (R.) - Comportement mécanique et électrique de films minces à haute température : application aux jauges d'extensométrie. - Paris 11, Orsay (1998).
Standardization
Extensometry does not lend itself to the establishment of standards as such. However, the documentation booklet below recalls, among other things, the concepts of elasticity which form the basis of extensometry.
- Résistance des matériaux et essais mécaniques de matériaux. Vocabulaire. - NF X 10-011 - 3-58
Manufacturers. Suppliers
Abelex
AMC.
ATEX (Applications of Extensometry Techniques).
Baléa SARL.
Bell and Howell France SA. - absorbed by Kodak : http://wwwfr.kodak.com
Beta. : http://www.betalasermike.com
...French and foreign organizations
The applications of extensometry are so varied that the technique is occasionally discussed by numerous technical associations. However, a number of industrial countries have set up associations or groups specializing in experimental stress analysis, of which extensometry is a major branch.
France
Groupement pour l'Avancement des Méthodes d'Analyse des Contraintes (GAMAC)....
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