Mean Stress Sensitivity
Mean stress sensitivity is the behavior of a material under increased static stress. As mean stress increases, the allowable vibration amplitude decreases. This is represented in diagrams such as Smith-Watson-Topper or Haigh.
Physicochemical mechanism of action
Mean stress sensitivity describes how a material's behavior changes under static stress. At elevated mean stress, the material's ability to withstand cyclic loads or deformation can be reduced.
Metallurgical relevance & welding risks
In welding, high static stresses can occur, especially in heavily loaded components. Increased mean stress sensitivity makes the material less flexible and more prone to cracking or deformation. This can lead to safety issues, particularly in high-stress components.
Workshop practice & instructions
To account for mean stress sensitivity in the workshop, it is important to minimize static stress during welding. This can be achieved through careful selection of welding process and materials. For highly sensitive materials, additional measures such as controlled cooling or the use of stress limiters should be taken.