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a CAFL, constant-amplitude fatigue limit.

a CAFL, constant-amplitude fatigue limit.

The inverse slope of the regression line fit to the test data for welded details is typically in the range 2.9 to 3.1 [8]. In the AISC, AASHTO, AREMA, and CSA codes as well as in Eurocode 3 (EU3) [20], the slopes have been standardized at 3.0. Therefore, the S-N curves can be represented by the following power-law relationship:

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