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Extensometric tests
Extensometry is a non-destructive inspection method for evaluating the tensile status of the material of a component in certain key positions. It is a fundamental survey supporting the designing and research & development stages, which allows to monitor tensions and strains locally undergone by a material, thus to evaluate to what extent the points highly stressed during use get close to the elastic limit.
An extensometer is an extremely accurate measuring device capable of detecting strains of a few ppms (parts per million).
Extensometric surveys allow to evaluate - directly on components – the tension-strain level reached during the various conditions of assembly, manufacturing, use, environment, etc. Extensometry is a useful check instrument for designers, as it enables them to check peak tensions in most critical areas and to compare experimentally-obtained data with the data obtained during designing.
This technique evaluates the most complex multiaxial tension states also indicating the main stress directions. Extensometry is thus a reliable system to evaluate the stressing of a component; it also gives a valid help in preventing unexpected failures occurred during use.
This technique can be successfully used in any component life stage: during manufacturing, assembly or use. Undoubtedly interesting is the fact that the surveys can be directly carried out on site, thus in completely realistic operating conditions.
Thanks to the system of input data getting and recording, the values obtained during tests can then be processed in order to observe, e.g., how the local tension changes according to the various load conditions considered.
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