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Glossary

Loading Factor (kL)

Historically, fatigue limits have been determined from simple bending tests where there is a stress gradient in the test specimen. A specimen loaded in tension will have a lower fatigue limit than one loaded in bending. An empirical correction factor, called the loading factor, is used to make an allowance for this effect.

Loading Type kL
Axial 0.9
Bending 1.0
Torsion 0.57