SCREW HAVING EXTENSOMETRY GAUGES FOR MEASURING THE TENSION STRESS AND / OR SHEAR SUBJECT (S) THROUGH THE SCREW

摘要

Screw (1) having a head (2) and a cylindrical body (3) threaded, the head (2) being provided with strain gauges (8) arranged to deform in order to measure an internal stress to the screw ( 1), said gauges (8) being for this purpose connected or able to be connected to a power supply and to determining means for determining the value of at least one internal stress from the deformations of said gauges (8), characterized in that the head (2) has, on its upper face (2a), a conical hole (10) whose axis of revolution is aligned with the axis of revolution of the cylindrical body (3), and that said gauges (8) are arranged on the wall of the conical hole (10) to deform with the conical hole (10) and oriented to measure at least one type of internal stress selected from traction and shear.