Analysis Of Mechanical Characteristics And Fatigue Damage Of SCR

As the gradual exploitation of deep sea oil resources, the riser has been taken into practice in the deep sea areas and even extra deep sea areas. Especially in the deep sea service region, it will always be subjected to complex environment loading, which yields high mode vibration and further is vulnerable to fatigue damage. This essay focuses on the mechanical characteristics and the factors relative to fatigue damage.The present research and future trend for fatigue damage of deep sea SCR are introduced at the beginning. Finite differential method is applied to amalyze the static deflection and the relation between deflection and dynamic boundary. Next, mode vibrations characteristics are analyzed. Finite element method is used to analyze the relation between top tension, top pressure, velocity inside the pipe and frequency and mode.Then, dynamic characteristics are analyzed based on software SHEAR7. The effects of elastic module,top tension, top pressure, velocity inside the pipe etc ,on RMS(Root-Mean-Square) stress and damage ration are calculated and analyzed.Last, the tube-soil interaction is simulated as a flexible pipe supported on a bed of springs. Deflections and bending stresses in the pipe are simulated based on Finite Element Method and Finite Differential Method. The finite differential algorithm has capabilities for analyzing different types of springs. By comparison with experiment data, it can be found that numerical simulated results for the bending moment, touchdown point and peak soil reaction force are in good agreement with the experiment data.