Equivalent fatigue life distributions under two-level cyclic stress are analyzed experimentally, and a model of describing equivalent life distribution is presented. Based on the equivalent life distribution model, an 'equivalent damage-equivalent life distribution' method is developed to predict fatigue failure probability under variable amplitude loading. The underlying principles are fatigue damage accumulation rule and 'load cycles-fatigue life' interference theorem. In the equivalent damage-equivalent life distribution method, two parameters, i.e. mean and standard deviation of the (equivalent) life distribution are used to describe cumulative fatigue damage effect. A basic feature of the equivalent damage-equivalent life distribution method is its capability of reflecting the loading history dependent change of the equivalent life distribution. Tests under multi-level stress show a good agreement between predicted fatigue failure probability and the test results.
Equivalent life distribution and fatigue failure probability prediction
International Journal of Pressure Vessels and Piping ; 76 , 4 ; 267-273
1999
7 Seiten, 21 Quellen
Aufsatz (Zeitschrift)
Englisch
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