Fatigue Notch Factor
The fatigue notch factor shows the ratio of the fatigue strength of a smooth specimen to that of a notched specimen. It helps estimate the risk of notch effects.
Physical-Chemical Mechanism of Action
The fatigue notch factor (FNF) is a measure of the durability of a material specimen under cyclic loading. It is calculated by the ratio of the fatigue strength of a smooth specimen to that of a notched specimen.
Metallurgical Relevance & Risks in Welding
A high fatigue notch factor means that the notched specimen has less durability under the same load. This increases the risk of notch effects and can lead to premature failure.
Workshop Practice & Action Instructions
To minimize the fatigue notch factor, pay attention to the correct notch shape and depth. Use stronger materials for heavily loaded parts or optimize the notch geometry. When selecting materials, consider the fatigue notch factor and choose materials with a low FNF.