METHOD FOR MONITORING AND CONTROLLING STRESS IN A THREADED MEMBER

摘要

The tensile or compressive stress (Ft) in a threaded member (18) is determined by subtracting an unscrewing torque from a screwing torque, and dividing the resulting torque difference by a coefficient proportional to the screw pitch (19) of said member. The torque values are recorded either statically at the screwing and unscrewing rest limit, or dynamically in a series of corresponding screwing and unscrewing positions. The method is particularly useful for measuring, monitoring and controlling stress in threaded fastening members used in screwed joints.