Fatigue damage and life of a composite production riser
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abstract
This research investigates the long term serviceability of a production riser which consists of specially orthotropic carbon-epoxy layers. All the cyclic stress magnitudes and number of cycles generated by a long term sea state are obtained by utilizing the Rayleigh probability function along with a series of frequency domain finite element analysis. In this study, the problem is reduced to estimations of lamina-level fatigue, and various unidirectional S-N relationships are used in order to present a range of possible fatigue life for the composite riser. As expected, the results suggest that the composite riser will satisfy the intended service life and is likely to have an infinite life provided that the material has average fatigue properties. However, prediction on dominant sea characteristics may differ depending on the choice of S-N representation and parameters.
