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Bending capacity of sandwich pipes

机译：三明治管的弯曲能力

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摘要

A sandwich pipe (SP) is an effective design alternative, providing effective load carrying capacity and thermal insulation to pipelines, especially when the pipe is going to be utilized in deep and ultra-deep water applications. However, the design and development of a reliable SP requires an in-depth understanding of the behavior of such a system under various loading conditions. In this paper, the behavior of SPs subject to pure bending, which is one of the governing loading conditions for offshore pipelines, is investigated. In order to perform this investigation, a series of numerical parametric models, using the finite element (FE) method, was developed. The linear eigenvalue buckling analysis and the nonlinear post-buckling analysis were conducted to explore the systems' response. The influence of several significant structural parameters on the pre-buckling, buckling and post-buckling responses of SPs was investigated. The parameters investigated included various combinations of several geometrical and material properties, as well as the consideration of various possible intra-layer adhesion mechanisms. Moreover, the recent high strength steels used in formation of oil and pipes exhibit certain degree of yield anisotropy; it is therefore crucial to understand the effect of material's yield anisotropy on such system's response. This issue has also been considered in this research.
机译：夹层管（SP）是一种有效的设计替代方案，可为管道提供有效的承载能力和绝热性能，尤其是在将管道用于深水和超深水应用中时。但是，可靠SP的设计和开发需要深入了解此类系统在各种负载条件下的行为。在本文中，研究了SP承受纯弯曲的行为，这是海上管道的主要加载条件之一。为了进行这项研究，开发了一系列使用有限元（FE）方法的数值参数模型。进行了线性特征值屈曲分析和非线性后屈曲分析，以探索系统的响应。研究了几个重要的结构参数对SP屈曲前，屈曲和屈曲后响应的影响。研究的参数包括几种几何和材料特性的各种组合，以及对各种可能的层内粘合机制的考虑。此外，最近用于石油和管道形成的高强度钢表现出一定程度的屈服各向异性。因此，了解材料的屈服各向异性对此类系统响应的影响至关重要。此研究中也考虑了这个问题。

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