A device for measuring deformations of a sample subjected to a shear test

摘要

The equipment enables the measurement of the shearing deformation of a sample (1) when subject to a test force by jaws (4). The jaws exert their force with the aid of a pair of stirrups (9,10) carrying points (27 & 28) which surround the sample. The force is exerted between pairs of point contacts (30,31;30'31') which are slightly displaced along the length of the sample in order to measure the different deformations. The stirrups (9,10) slide one over the other and eventually move between the jaws. An extensometer connected to the stirrups measures their displacement directly.