Effect of preload scatter on fatigue life of subsea pipeline connector bolts located at suspended span section

IF 1.5 4区工程技术 Q3 ENGINEERING, MARINE

Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment Pub Date : 2024-09-14 DOI:10.1177/14750902241272867

Huan Xie, Wei Zeng, Dong-run Zhu, Wen Sun, Hong Song

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引用次数: 0

Abstract

The subsea pipeline connector (SPC) located at suspended span section not only bears the internal pressure from the oil and nature gas of the pipeline, but also needs to withstand the periodic drag force generated by vortex-induced vibration (VIV). This situation may cause fatigue failure of the flange connector fastening bolts. Reasonable preload value can reduce the fatigue stress and improve the fatigue life of the SPC bolts. This paper establishes a calculation model of the SPC drag force under VIV located at suspended span section. Normal distribution function is used to establish random models of preload for corner control pretension method and hydraulic tension pretension method considering the scatter of the preload value. On this basis, the stochastic finite element model (S-FEM) of SPC bolts is established to analyze bolts force under random preload considering VIV. The regression equation of strain-life for smooth fatigue specimens of bolt materials is applied to obtain preload-fatigue life curves of SPC bolts under different pretension methods. Then it is used to analyze the preload scatter on fatigue life of SPC bolts located at suspended span section. The analysis results indicate that the fatigue life dispersion of SPC bolts pre tightened by hydraulic tension pretension method is smaller compared with the corner control pretension method. Compared with the preload value determined by ASME code, increasing the SPC bolts preload appropriately can improve the fatigue life of SPC fastening bolts located at suspended span section.

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预紧力分散对位于悬吊跨度段的海底管道连接螺栓疲劳寿命的影响

位于悬吊跨度段的海底管道连接器（SPC）不仅要承受来自管道石油和天然气的内部压力，还需要承受涡流诱导振动（VIV）产生的周期性阻力。这种情况可能会导致法兰连接紧固螺栓的疲劳失效。合理的预紧力值可以降低疲劳应力，提高 SPC 螺栓的疲劳寿命。本文建立了位于悬挂跨度截面 VIV 下 SPC 阻力的计算模型。考虑到预紧力值的分散性，采用正态分布函数建立了转角控制预紧力法和液压拉伸预紧力法的预紧力随机模型。在此基础上，建立了 SPC 螺栓的随机有限元模型 (S-FEM)，以分析考虑 VIV 的随机预紧力下的螺栓力。应用螺栓材料光滑疲劳试样的应变-寿命回归方程，得到不同预紧方法下 SPC 螺栓的预紧-疲劳寿命曲线。然后利用该方程分析了预紧力散布对位于悬挂跨度截面上的 SPC 螺栓疲劳寿命的影响。分析结果表明，与转角控制预紧法相比，液压张力预紧法预紧的 SPC 螺栓的疲劳寿命散度较小。与 ASME 规范确定的预紧力值相比，适当增加 SPC 螺栓的预紧力可以提高悬挂跨段 SPC 紧固螺栓的疲劳寿命。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment ENGINEERING, MARINE-

CiteScore

3.90

自引率

11.10%

发文量

审稿时长

>12 weeks

期刊介绍： The Journal of Engineering for the Maritime Environment is concerned with the design, production and operation of engineering artefacts for the maritime environment. The journal straddles the traditional boundaries of naval architecture, marine engineering, offshore/ocean engineering, coastal engineering and port engineering.