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Axial and Burst Analysis of OffshoreComposite Risers

机译:离岸复合立管轴向和突发分析

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As offshore production activities move into deep and ultra deep water, composite materials offer considerable weight reduction, which leads to cost savings associated with a decrease in the payload and downsizing of the main components. In this paper, the structural response of a production riser as a component of a tension leg platform is simulated. First, a burst analysis under extreme internal pressure is performed to assess the burst capacity of the composite riser. Second, a global static structural analysis of the entire riser system under various loads is conducted, which is followed by a detailed section analysis to examine stresses and strains in the riser on a layer-by-layer basis. Also, in the section analysis, various damage theories are incorporated with reasonable stiffness reductions applied. The burst analysis shows that the metal liner is the most vulnerable part. The global axial analysis demonstrates the impact of using a composite material on the weight reduction and provides the boundary conditions for the subsequent local section analysis. In the local section analysis, no damage is expected in the particular loading scenario. When the loads are increased, failure of the metal liner takes place first and propagates rapidly, which leads to more damage in the neighboring composite layer due to load redistribution.
机译:由于海上生产活动进入深层和超深水,复合材料具有相当重量的减少,这导致节省成本节省,与主要部件的有效载荷和缩小尺寸减少相关。在本文中,模拟了作为张力腿平台的组件的生产提升管的结构响应。首先,进行极端内部压力下的突发分析以评估复合立管的突发容量。其次,进行了在各种载荷下的整个提升管系统的全局静态结构分析,然后进行详细的截面分析,以逐层检查提升管中的应力和菌株。此外,在截面分析中,施加了各种损伤理论,施加了合理的刚度减少。突发分析表明,金属衬里是最脆弱的部分。全局轴向分析表明使用复合材料对重量减少的影响,并为随后的局部分析提供边界条件。在本地分区分析中,在特定的加载方案中没有预期损坏。当负载增加时,金属衬里的失败首先发生并且快速传播,这导致相邻复合层引起的损坏引起的负载再分布。

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