Article | REF: BM7850 V1

Stress concentration, fatigue life prediction

Author: Jean-François FLAVENOT

Publication date: July 10, 2004

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2. Local elastoplastic approach and Neuber's rule

The local elastoplastic approach, detailed in reference , is based on the observation that most fatigue cracks start from a geometric accident (notch, groove, thread, hole) and that the local concentration of stresses leads the material to exceed its elastic limit, either at each loading cycle (accommodation), or during the first few loading cycles before returning to elastic behavior (adaptation).

In this case, it is no longer sufficient to simply use elastic strength-of-materials or finite-element calculations. Cyclic plastic deformation must be taken into account to determine the local stresses...

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Local elastoplastic approach and Neuber's rule