Study Of Fatigue Life And Failure Mechanism Of Titanium Alloy Torsion Springs

Spiral torsion springs are widely used in aerospace and aviation,automobile manufacturing and other fields because of the characteristics of high stored energy and strong torsion force,becoming one of the very important parts of mechanical equipment.When the torsion spring is subjected to external load,the torsion spring produces elastic deformation,while the mechanical energy or kinetic energy is converted into deformation energy through its own structural deformation;when the load is unloaded,the deformation energy is converted into mechanical energy or kinetic energy is released,the torsion spring under the action of its own elastic force,the elastic deformation disappears,and the torsion spring returns to its original state.However,after a certain number of rotations in the working process,i.e.,after the expected life of the torsion spring,the torsion spring will inevitably fail.The failure of springs in many important mechanical equipment can have a significant negative impact on the equipment,so it is important to study the failure of torsion springs to improve the reliability of the working equipment.The following aspects of torsion springs in existing machinery and equipment have been investigated with respect to their performance changes during operation.The conclusions are as follows:First,the basic working principle of torsion springs is described,the structural parameters,characteristic parameters,materials and manufacturing processes of torsion springs are outlined,and the working characteristics and mechanical theory are briefly described.Second,a three-dimensional finite element model of the torsion spring was established,and the transient dynamics and modal analysis of the torsion spring were performed using the finite element analysis software ANSYS Workbench to obtain the stress distribution,deformation and the first six orders of intrinsic frequencies and the corresponding vibration patterns of the first four orders when the torsion spring is subjected to torsional deformation.The stress relaxation phenomenon of torsion springs was simulated using ANSYS to obtain the stress relaxation of torsion springs at the initial stage of service for the stress drop during the operation of torsion springs.Finally,the structure of the torsion spring was optimized and designed,and the primary and secondary causes affecting the minimum fatigue life of the torsion spring were investigated by correlating the parameters of the torsion spring.Simulation experiments were designed to determine the relationship between each parameter of the torsion spring and the minimum fatigue life.