Fatigue strength

Fatigue strength refers to a component’s resistance to repeated or cyclic loads. It therefore describes an important feature for components that are subjected to repeated stress during their service life.

Sufficient fatigue strength is important when components are subjected to recurring mechanical loads throughout their service life. It helps to ensure the reliable performance and service life of a component.

Fatigue strength is influenced, amongst other things, by the material, component geometry, surface condition, and the type and level of the load. The manufacturing process can also influence the mechanical properties of a component.

The plastic deformation that occurs during cold forming can lead to work hardening of the material. At the same time, a grain flow may develop that follows the component geometry. These effects influence the mechanical properties of the component. However, the actual fatigue strength that can be achieved also depends on the material, geometry, surface, residual stresses and the specific loading scenario.

No. Static strength and fatigue strength describe different loading scenarios. A component may be able to withstand a high one-off load and yet fail due to fatigue under repeated cyclic loading. Therefore, in addition to the material properties, the geometry, surface finish and the specific load history are also decisive for fatigue strength.