Carbon steel pipe lined with a thin layer of a corrosion resistant alloy is an economical product used in offshore pipelines that carry corrosive hydrocarbons. The liner and carrier pipe are mechanically expanded together so that on unloading they end up in interference contact. The contact pressure that develops is essential for keeping the composite pipeline intact under bending and axial loads experienced during offshore installation and operation. The manufacture of lined pipe by hydraulic expansion is analyzed with a custom model, which is used to establish the effect of various geometric, material, and manufacturing parameters on the contact pressure. The analysis incorporates incremental plasticity that accounts for material hardening and the biaxial states of stress that develop. It is demonstrated that plastification of the carrier pipe is beneficial, and that a relatively low yield stress liner with low hardening, coupled with a high yield stress high hardening carrier pipe increases the contact pressure. The analysis presented and the results should prove to be useful in the design of the manufacturing process of lined pipe aimed for offshore applications.

衬有耐腐蚀合金薄层的碳钢管是用于承载腐蚀性碳氢化合物的海上管道的经济产品。衬管和输送管在机械上一起膨胀，因此在卸载时它们最终会产生干涉接触。产生的接触压力对于在海上安装和操作过程中承受的弯曲和轴向载荷下保持复合管道完好无损至关重要。使用自定义模型分析了通过液压膨胀来制造内衬管的过程，该模型用于建立各种几何形状，材料和制造参数对接触压力的影响。该分析包含了增量塑性，该塑性解释了材料硬化和所产生应力的双轴状态。已经证明，输送管的塑化是有益的，并且具有低硬化的相对低屈服应力的衬里，与高屈服应力和高硬度的输送管相结合，增加了接触压力。提出的分析和结果应该被证明对设计用于海上应用的衬里管的制造工艺有用。