Analysis of local damage caused by deep-sea risers collision
In order to research the influence of deep-sea risers'local damage caused by collision,the flu-id structure interaction(FSI)model with the methods of ALE by the finite element software LS-DYNA was built.The accuracy of model was verified.At the same time the differences of the results of colli-ding damage with the varied boundary conditions was considered.Then the time history analysis of ef-fective stress and dent damage on account of risers collision with distinct velocities,angles and axial tension were also considered.The results showed that the fluid had a degree of buffering effect on the collision,and the value of effective stress and dent damage caused by colliding in the condition of cou-pling were less than non-coupling value.In the case of low speed and small angle,the damage of risers collision influenced by the change of angle was more obvious than that influenced by the change of speed.The axial force had little influence for dent damage,and there was a region where had a negative correlation between effective stress and axial tension.
deep-sea risersfluid structure interaction(FSI)local collisionfinite element analysis
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