Slope of the S-N Curve
The slope of the Wöhler line indicates how sensitive a material is to fluctuating loads. A steep slope means lower service life at the same load.
Physical-Chemical Mechanism of Action
The Wöhler curve slope describes how the fatigue life of a material depends on the load and the number of load cycles. In a double-logarithmic plot, it is represented by the exponent of the life curve.
Metallurgical Relevance & Welding Risks
A steep Wöhler curve slope means the material fails faster at the same load. This can lead to premature degradation of components and the need for more frequent repairs or replacements.
Workshop Practice & Action Instructions
To maximize the fatigue life, a shallow Wöhler curve slope should be preferred when selecting materials. This can be achieved through proper material selection and welding processes. For existing components, it is important to monitor load cycles and perform repairs if necessary.