To investigate the mechanical behavior of the unbonded umbilical and to improve the structural design, an analytical model to predict the tension behavior is proposed. The governing e-quation of the model provides the solution for the tension load-elongation relationship considering the effect of diameter reduction of armor layers. A finite element model of a given unbonded umbili-cal is established to supply the value of armor diameter reduction for analytical model and to deter-mine the stress distribution in the umbilical. Tension stiffness tests of the given unbonded umbilical are carried out and a good agreement among analytical model, finite element model and experimen-tal results is shown. Based on the analytical model, a parametric study is conducted to understand the effect of radial reduction on the tension stiffness. Furthermore, the fatigue analysis of the unbonded umbilical under design tension loading cases is also conducted.%为了提高对脐带缆力学特性的研究,便于设计,文中提出了一种脐带缆拉伸载荷作用下的理论模型.在总体控制方程中对拉伸过程中骨架层的径向缩减.针对给定的无粘结脐带缆脐,建立了有限元模型,模拟分析了骨架层的径向缩减对应力分布的影响.通过对拉伸刚度试验对比,理论分析与试验吻合度较高.基于解析模型,分析了径向缩减对拉伸刚度的影响.此外,在应力分析的基础上,对无粘结脐带缆在拉伸载荷作用下的的疲劳特性进行了研究.
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