COLLAR FOR MEASURING THE SIDE DEFORMATION OF A TEST DURING COMPRESSION TESTS, IN PARTICULAR UNIAXIAL OR TRIAXIAL TESTS

摘要

The invention relates to a collar (1) for measuring the lateral deformation of a test piece during uniaxial or triaxial compression tests. According to the invention, the collar (1) consists of a metal ring (2). or a ring of composite materials capable of gripping said open test piece and whose free ends (3) are spaced apart by a distance Delta, said collar further having means (5) for measuring, directly or indirectly, the spacing Delta, said free ends (3) of the ring (2), constituted by at least one strain gauge (6).