RING ZUR MESSUNG DER SEITLICHEN VERFORMUNG EINES PRÜFLINGS IN UNIAXIALEN ODER TRIAXIALEN KOMPRESSIONSTESTS

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 Delta. The inventive collar is also equipped with a measurement device for directly or indirectly measuring the distance Delta. 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.