Definition and symbolization of fatigue terms
Fatigue of ferrous alloys - Definitions and diagrams
Article REF: BM5042 V1
Definition and symbolization of fatigue terms
Fatigue of ferrous alloys - Definitions and diagrams

Author : Jian LU

Publication date: October 10, 2002 | Lire en français

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2. Definition and symbolization of fatigue terms

2.1 Nominal stress

The stress taken into account during fatigue testing is a nominal stress. It is calculated in relation to the net cross-section of the part or specimen under consideration, using the usual resistance of materials (RDM) formulas for the elastic domain. It does not take into account stress concentration due to notches or other causes. Normal stress is expressed as σ , and shear (or torsional) stress as τ .

Calculated stress is expressed in newtons per square metre (N/m 2 ...

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