Macroscopic yielding

An endurance limit effect due to macroscopic yielding can also be accounted for by using a modification factor applied to the SN- curve. The factor, np, is determined by decomposing the total strain at the endurance limit stress into the elastic and plastic portions of strain, as in the figure below.

In the left picture an unnotched structure is shown. The endurance limit is the same as for the material itself:

in the notch root

In the right sketch, a notched specimen under axial loading is shown where macroscopic yielding can be obeyed. Here we get:

where

Effect of Macroscopic Yielding on Endurance Limit

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The fatigue notch factor

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Neuber's approach to micro-yielding

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Macroscopic yielding, Simcenter 3D 2021.1 Series

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