Torsion springs mainly play a balancing role in industrial production. For example, in a car’s suspension system, which interacts with the car’s shock absorbers, the torsion angle of the spring deforms the material and returns it to its original state. Thereby preventing the car from shaking too much, which plays a good role in protecting the safety system of the car. However, the spring will break and fail during the entire protection process, which is called fatigue fracture, so technicians or consumers should pay attention to fatigue fracture. As a technician, we should do our best to avoid sharp corners, notches, and sudden changes in section in the structural design of parts, thereby reducing fatigue cracks caused by stress concentrations.