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Glossary

Stress Life Curve

The stress-life curve is a graphical representation of fatigue data. It represents the relationship between fatigue life, in cycles, and the applied stress amplitude.

These data are often fit to a simple power function relating stress amplitude to fatigue life. The intercept, S'_f, is taken at 1 cycle and the slope is denoted b. In the absence of actual test data, an approximation can be obtained from the ultimate strength, S_u, of the material.

S_f' = 1.6S_u and b = -0.085.