SEDL / STP / STP1231-EB / STP13959S

Fatigue Life Prediction Under Periodical or Random Multiaxial Stress States

Robert, J-L
Attaché on temporary assignment for research and professor, Laboratoire de Mécanique des Solides, INSA-LYON, Villeurbanne,

Fogue, M
Chargé de cours, Ecole Polytechnique de Yaoundé, Cameroun,

Bahuaud, J
Attaché on temporary assignment for research and professor, Laboratoire de Mécanique des Solides, INSA-LYON, Villeurbanne,

Pages: 19    Published: Jan 1994

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Abstract

A fatigue life prediction method suitable for multiaxial stress states and constant amplitude or random loading is developed. In the case of random loading, a suitable counting variable is proposed so that the rainflow counting method can be applied in order to extract cycles. A multiaxial fatigue life criterion is used to define the damage corresponding to each cycle. This criterion is based on the quadratic mean value of a damage indicator over all the planes through the point where the fatigue life calculation is made. The validation of this criterion is made with periodical multiaxial fatigue test results. Miner's rule is used for the cumulation of the damage. The whole fatigue life of the component is evaluated in terms of the number of repetitions of the loading block.