Device to determine the coefficient of the hydric expansion of the elements of a composite structure
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United States of America Patent
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-
Aug 4, 1992
Grant Date -
N/A
app pub date -
Oct 25, 1990
filing date -
Oct 30, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
So as to determine the coefficient of hydric expansion .beta. of the elements of a composite structure, a sample of this structure is placed in a rigid cradle (10) so that one extremity of the sample is rigidly maintained and that the length variations of the sample are measured by a displacement transducer (12) borne by the cradle. The transducer (12) is preferably a linear differential transformer contact transducer and it is kept under constant humidity by injecting dry air through a flexible tube (60, 64) connected to its rear section. By placing the cradle (10) bearing the sample in a climatic chamber (40), whose humidity is made to vary at a constant temperature, and by at the same time measuring the weight of the sample, it is possible to determine the coefficient .beta..
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