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The four-point method to estimate fatigue life behavior from tensile properties allows the construction of fatigue life curves from more readily available handbook data. This article provides information on the strain-based four-point method and the stress-based four-point method. The effects of mean stress or strain on transition fatigue life are reviewed. The article describes the determination of four fatigue-life parameters either by curve fitting actual fatigue life test data or approximating the constants from tensile properties. It contains a table that lists the tensile properties of various alloys.

The stress-intensity concept is based on the parameter that quantifies...

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