PSI - Issue 57

Yann Chevalon et al. / Procedia Structural Integrity 57 (2024) 633–641 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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The flow chart hereunder gives an overview of the method:

Fig. 10 Flow chart of the fatigue model for polymers used in flexible pipes

Prototypes of pipes are also tested in full scale, especially for the validation of fatigue capacity of the TA. These tests have been used to check the fatigue model of the polymeric layers, by estimating the fatigue damage applied to the outer sheath and inner pressure sheath during the full-scale test part and completed by small scale destructive cyclic testing. These complementary tests are used to measure the remaining fatigue capacity of the extruded layers. Overall, full-scale tests confirmed that the polymer fatigue damage is lower than the tensile armour steel fatigue damage.