A non-destructive measurement method for axial force using torque in connecting bar with joint bearing ends

The measurement of axial force in connecting bar is widely used in scenarios such as condition monitoring, motion controlling and fatigue analysing of mechanisms. By measuring the torque applied to the bar, this paper proposes an innovative method for non-destructive obtaining axial force in connecting bar with joint bearing ends. A mechanical analysis of joint bearing is conducted, and a theoretical model of axial force and torque is established. An experimental setup for measuring axial force and torque is constructed, and then the theoretical model is refined. The bar axial force and torque formula is calibrated at different torsional speeds, and the method correctness and reliability are verified experimentally. In summary, in a non-destructive way, this method is innovative and practical, addressing issues like inaccuracies in measuring bars with variable cross-section, even unknown material and inside structure, achieving relatively accurate measurement of axial force in connecting bar without damage.