Compressive Residual Stress Profile
The compressive residual stress profile shows the distribution of mechanical compressive stresses in a material, created by shot peening or hammering. It prevents the opening and propagation of fatigue cracks under cyclic loading.
Physicochemical mechanism of action
Mechanical compressive stresses are introduced into the material by shot peening or hammering. These stresses affect the mechanical properties of the material and can prevent cracks by closing them.
Metallurgical relevance & risks in welding
An uneven compressive residual stress profile can lead to stress concentrations that promote fatigue cracks. If handled incorrectly, these cracks can propagate further under cyclic loading and damage the material.
Workshop practice & instructions
To create a homogeneous compressive residual stress profile, shot peening or hammering should be applied evenly to the material. The number and intensity of passes must be precisely controlled. When welding, it is important to ensure that the compressive residual stress profile is not disturbed to maintain the mechanical stability of the material.