Abstract— Fluid-structure interaction has a significant effect on stresses in the hinge point because of the impact of ocean currents to the pipeline. Aimed to support arms for deep-sea mining, numerical analysis method and the finite element software ADINA were adopted to analyze the pipeline structure – external fluid mutual coupling effect on stress at the hinge point. The results were shown that: (1) In the case of different wall thickness, the stress changes of the entire pipeline is relatively small, stress located mainly these places close to the junction in the pipelines, the maximum stress exists at the upper connection; (2) With wall thickness of the support pipe increasing, the maximum stress decreases, and when wall thicknesses changed from 9.5mm to 28.7mm interval 2.4mm ,the maximum stress value decreased 19.3%, 15.9%, 13.5%, 11.7%, 10.3%, 9.2%, 8.3%, 7.6% ;(3) With wall thickness increasing, the minimum stress value also reduced, and a minimum stress values decreased 19.9%, 14.0%, 5%, 14.6%, 28.7%, 15.9%, 8.6%, 2.7%,respectively.
Keywords— Support arm, Fluid–structure interaction, Different wall thickness, Stress.
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