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Gunnstein / fatpack

fatpack provides functions and classes for fatigue analysis of data series.
ISC License
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Endurance curve #4

Closed LolloCappo closed 4 years ago

LolloCappo commented 4 years ago

Can you please provide a reference and theoretical explanations for the endurance curve definition? It is not that clear to me the usage of Sc on the definitions. Thanks

Gunnstein commented 4 years ago

Please check out my answer to issue #1 for some references to endurance curve definitions.

An endurance curve (also known as a SN curve) defines the fatigue resistance of a structural detail and is determined by the material properties and the stress distribution due to loading and local geometry in the structural detail. Sc (detail category) is one of the parameters that is used to define an endurance curve, a small Sc means low fatigue resistance and a high Sc means high fatigue resistance.

For an concrete example of what Sc is: see figure 7.1 on page 17 in Eurocode 3, which shows different endurance curves from Sc=36MPa to 160MPa.

In practical use, where you have to determine the fatigue life of a structural detail, you would first find the relevant structural detail in the second column of table 8. The detail category (and also endurance curve/fatigue resistance) of that structural component is then found in the first column of the corresponding row.

LolloCappo commented 4 years ago

Thank you very much for the explanation and the details!