COLLAR FOR MEASURING THE LATERAL DEFORMATION OF A TEST PIECE DURING COMPRESSION TESTS, SUCH AS UNIAXIAL OR TRIAXIAL COMPRESSION TESTS

摘要

the invention relates to a collar (1) for measuring lateral deformation of a test specimen in uniaxial or triaxial compression tests.according to the invention, the collar is formed by a ring (2) made of metal or a composite ring around the tube, able to open.and whose free ends are removed from the collar with a distance.delta., in addition means (5) for measuring, directly or indirectly, the spacing.delta.of the free ends (3) of the ring (2), a probe (6) consisting of a linear differential transformer type.the invention relates to a protective sheath tube is able to cooperate with the collar.