1.2.4 Cyclic Reduction Factor

At some point, in the vicinity of 7,000 cycles, the (Syc + Syh) limitation intersects the fatigue curve for carbon and low alloy steel. The allowable stress range must therefore be reduced to fit the fatigue curve for cyclic applications with 7,000 cycles or more:

SE <= F f (SYC + Syh)

Where:

f = cyclic reduction factor, as shown in the accompanying table

cyclic reduction factor, as shown in asme b31.3 for process piping

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Introduction to Pipe Stress Analysis

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