径向夹持载荷作用下海洋柔性管骨架层的静力特性研究

骨架层径向压缩失效是海洋柔性管的主要失效形式之一。为了分析海洋柔性管骨架层在径向夹持载荷作用下的力学特性，基于ABAQUS建立了考虑材料非线性的骨架层数值模拟模型，得到了层间相互作用和压块数量对骨架层径向压缩时力学特性的影响。计算发现:当施加相同载荷时，考虑骨架层层间滑动将增大骨架层径向压缩位移；压块数量是骨架层径向压缩特性的重要影响因素，压块数量越多，骨架层径向压缩刚度越大，许可径向压缩力越大，但许可径向压缩位移越小；压块数量超过4个时，压块数量对骨架层径向压缩特性的影响逐渐减小。研究结果表明，给出的数值方法能有效计算柔性管通过不同压块数量的张紧器时，柔性管不发生过度变形的最大加载位移和最大夹持力。 

Study on the Static Characteristics of Marine Flexible Riser Skeleton Layer under Radial Clamping Loads

The radial compression failure of the skeleton layer is one of the main failure modes in marine flexible riser.In order to study the mechanical properties of the skeleton layer of the flexible marine riser under radial clamping load,an ABAQUS-based skeleton layers numerical simulation model was established to define the influences of inter-layer interaction and lock blocks number on the radial compression of skeleton layers,while taking material nonlinearity into account.Calculation results suggest that the inter-layer sliding will increase the radial compression displacement of skeleton layers when the same load is applied.The number of lock blocks is an important factor affecting the radial compression characteristics of skeleton layers;the number of lock blocks will increase the radial compression stiffness of skeleton layers and allowable radial compression force,which will render a smaller allowable radial compression displacement.Once the number of lock blocks is over four,the influence of the number of blocks on radial compression characteristics of skeleton layer reduces gradually.This study demonstrates that the numerical method in this paper can effectively calculate the maximum loading displacement and the maximum clamping force of the flexible riser without excessive deformation when passing through the tensioner with various numbers of lock blocks.