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A fatigue limit (endurance limit) was not found.
Stress amplitudes above the endurance limit lead to cyclic hardening.
Its relevance for fracturing and endurance limit is discussed.
Tensile mean stress (R=0.1) lowers the endurance limit to 160 MPa.
Conventional design codes base their recommendations still on the common prejudice that an "endurance limit" exists.
Additionally, some metals may show stable cyclic plastic deformation at the endurance limit.
Endurance limit stresses are correlated with thresholds of fatigue crack growth.
Endurance limit and fatigue safety factor is calculated, fatigue cycle analysis of the shaft is estimated.
Mean stress (R=0.1) lowers the endurance limit to 160 MPa.
The microplasticity threshold is approximately 0.15% which corresponds to the fatigue endurance limit of 30.8 MPa.
The apparent lack of a damage initiation stage may account for the low endurance limit reported.
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