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Strength of Materials: Fatigue Limit

It is also possible to calculate the fatigue limit based on how many cycles you would want the specimen to endure before it fails. To do this equations 1 through 3 would be used.

fatigue stress (1)

a fatigue stress equation (2)

b fatigue stress equation (3)

From equations Sut represents the ultimate tensile strength, Se represents the endurance limit, and f represents the fatigue strength fraction. The fatigue strength fraction can be found using the figure below.

Fatigue strength fraction graph

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