Flexible pipes play an important role in the transportation of oil and gas from the seabed to floating production units. They are also employed to inject water or gas into offshore wells. In deep-sea oil and gas extraction, flexible pipes must be able to withstand very high tensile and hydrostatic pressures. In this paper, an equivalent method is used to represent the complex carcass layer and the pressure armor layer as a regular cylinder, and then a numerical model of a 2.5" flexible pipe was developed and verified by experiment. A tensile analysis of flexible pipes with different degrees of initial ovalization indicated that ovalization of 0–1% does not affect the tensile rigidity, but increasing the ovalization creates an uneven load and stress concentration on the tensile armor layer. When a flexible pipe is subjected to hydrostatic pressure, the outer pressure increases the tensile rigidity of the flexible pipe more than the annular pressure, but the reduction of the ultimate tensile load is clear. A high annular pressure can cause the collapse of the carcass layer.

挠性管在从海底到浮动生产单元的石油和天然气运输中起着重要作用。它们还被用来将水或天然气注入海上油井。在深海油气开采中，挠性管必须能够承受很高的拉伸压力和流体静压力。本文采用等效方法将复杂的胎体层和压力铠装层表示为规则的圆柱体，然后建立了2.5“挠性管的数值模型，并通过实验进行了验证。不同程度的初始椭圆化程度表明，0-1％的椭圆化度不会影响拉伸刚度，但是增加椭圆化度会在拉伸铠装层上产生不均匀的载荷和应力集中。当软管承受静水压力时，外部压力会比环形压力更大地提高软管的抗拉刚度，但最终抗拉载荷的降低是显而易见的。较高的环形压力会导致胎体层塌陷。