Validation of a 3-dimensional finite element analysis model of a deep water steel tube umbilical in combined tension and cyclic bending

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Validation of a 3-dimensional finite element analysis model of a deep water steel tube umbilical in combined tension and cyclic bending

Corre, Vincent Le / Probyn, Ian

The global behaviour of 3-Dimensional Finite Element Analysis (3-D FEA) models of umbilical structures have previously been validated against full scale test data in monotonic tension, bending and crushing load cases. The advantage of the 3-D FEA method is that complex combinations of loading conditions, such as tension with cyclic bending, can be assessed where non-linear behaviour from friction is an important aspect. This paper focuses upon validation of the 3-D FEA model for cyclic bending under tension load case. An important aspect of accurately modelling the behaviour is the complex stick, partial slip and full slip behaviour of the internal components. Particular attention is paid to the resisting moment resulting from internal friction, known as the friction moment. The effect of increasing tension on the friction moment is studied. The kinematics of sliding are compared to analytical models developed for helically wound structures, such as flexible pipes, and show a very good correlation that confirms the accuracy of the model. Also, the mean axial strain of the steel tubes due to the friction induced by this sliding is highlighted. The hysteretic curves of the axial strain in steel tubes subjected to cyclic bending under tension are derived and validated against full scale experimental data.