Testing of viscoelastic materials
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United States of America Patent
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-
Jan 14, 1992
Grant Date -
N/A
app pub date -
Sep 17, 1990
filing date -
Sep 20, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a method of testing a sample of viscoelastic material held under pressure between two opposing, temperature-controlled dies, the sample is subjected to an oscillatory, rotary shearing force which has a predetermined amplitude and a frequency within the range 0.001 to 2 Hz, and a torque which is indicative of the response of the sample to the shearing force is measured, at least one measurement of the torque being made when the predetermined amplitude is at least .+-.10.degree. but not greater than .+-.360.degree..
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