Collar for measuring the lateral deformation of a test piece during compression test, such as uniaxial or triaxial compression tests
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United States of America Patent
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Apr 21, 2009
Grant Date -
Aug 14, 2008
app pub date -
May 22, 2006
filing date -
May 24, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
The invention relates to a collar for measuring lateral deformation of a test piece during uniaxial or triaxial compression tests. According to the invention, the collar includes a metal hoop or a hoop that is made from composite materials, which can clasp the test piece. When the hoop is open, the free ends thereof are separated by a distance Δ. The inventive collar is also equipped with a measurement device for directly or indirectly measuring the distance Δ. Between the free ends of the hoop, the device can be a linear variable differential transformer-type probe. The invention also relates to a protective sleeve for the test piece, which can co-operate with the collar.
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