In two-dimensional fatigue load spectrum, the range and mean of random load are regarded as two random variables which could be obtained by rainflow method. Joint probability density function of the two variables is built up on the statistical analysis of load history. Applying constant amplitude median Sa-Sm-N surface function, a fatigue life prediction method of two-dimensional load spectrum is presented based on Miner' s rule. In the last part,an example is presented to demonstrate the application of the prediction method, and it shows that the two-dimensional fatigue life prediction method is practicable in fatigue life analysis for engineering structures.
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