Mean Stress Effect
The mean stress influence affects the allowable stress range through static base stresses. Tensile mean stresses reduce the dynamic amplitude.
Physical-Chemical Mechanism of Action
The mean stress influence is a phenomenon where superimposed static base stresses (e.g., tensile mean stresses) reduce the allowable dynamic amplitude of a system. This happens by changing the oscillation width and can lead to a limitation of movement capability.
Metallurgical Relevance & Risks in Welding
In welding technology, mean stress influence means that static base stresses like tensile mean stresses reduce the allowable dynamic amplitude of a system. This can lead to increased susceptibility to cracks and deformations, especially when the vibration frequency is near the resonance point. A too high stress level can also cause the material to not deform as expected, leading to unwanted material deformations and defects.
Workshop Practice & Instructions
To minimize mean stress influence, the following measures should be taken:
• Stress control: Make sure that static base stresses (e.g., tensile mean stresses) stay below an acceptable level.
• Frequency optimization: Avoid frequencies near the resonance point to ensure maximum allowable oscillation width.
• Material selection: Choose materials with low sensitivity to mean stress influence for applications with high static base stresses.