Mean stress
Mean stress is the average of the maximum and minimum stress in a cyclic loading. It accelerates the fatigue of components.
Physicochemical mechanism of action
Mean stress is the arithmetic mean of the maximum and minimum values of an alternating load. In mechanical systems, it can lead to continuous stress on components, which may cause permanent deformation.
Metallurgical relevance & welding risks
Positive mean stress increases the stress in weld areas and can accelerate fatigue. This can lead to earlier cracking and deformation in the material, especially in high-strength steels or under high mechanical loads.
Workshop practice & instructions
To minimize fatigue, the mean stress should be kept as low as possible. When selecting welding parameters, it is important to ensure sufficient cooling time and controlled heat input. For highly stressed components, use special welding methods or materials with higher fatigue resistance.