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 the lateral deformationa specimen in uniaxial or triaxial compression tests. according toin the invention, the collar (1) is formed by a metal ring (2), orring around the composite material suitable for open tube.the free ends (3) are excluded from the.delta. distance.in addition, the collar with means (5) for measuring, directly orindirectly, the spacing.delta., such free ends (3).the ring (2), formed by at least one strain gauge (6).