Abstract
This paper studies the loading sequence effect on fatigue damage accumulation and puts forward the kneepoint coordinate formulae and two-stage fatigue damage cumulative rules (KDR) under L-H loading and H-L loading by analysing extensive fatigue damage test data and theoretical research. KDR can be used more widely for various complex loadings than Manson's double linear damage rule. The damage line in the paper is closer to experimental data than Miner's straight line. Experimental verification of two- and three-level stresses with different loading sequences has shown that the average error of residual life estimated by KDR is 12.2% and is much less than that of 50.1% estimated by Miner's rule.
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