Bolted joints are widely used in aircraft structural assembly.At present,preload is controlled indirectly by controlling the tightening torque to ensure connection reliability.However,due to manufacturing deviations and positioning errors in the connecting structure and tooling,it is inevitable that the hole inclination and the end face of the connected part are not parallel,which may affect the conversion relation between the tightening torque and the preload force,which in turn affects the final preload force.By combining experiments and finite element simulation,the transformation relation between the tightening torque and the preload as well as the influence of the above deviation on the preload in the tightening process is explored,which is crucial to improving the accuracy of the preload in engineering practice.Significant influence of the hole tilt deviation on the tightening torque-preload conversion relation is found beyond a certain threshold.The influence of the end face non-parallel deviation is similar.
bolted jointstightening processdeviationtightening torque-preloadfinite element simulation
NETL
NSTL
万方数据
