| 陈鲲鹏，罗宇，张萌萌，杨奕，杜长江，付世晓.含应力松弛的柔性管端部密封性能数值模拟[J].海洋工程,2026,(1):151~162 |
| 含应力松弛的柔性管端部密封性能数值模拟 |
| Numerical simulation of sealing performance of flexible pipe end fitting with stress relaxation |
| 投稿时间：2024-11-27 修订日期：2025-02-13 |
| DOI：10.16483/j.issn.1005-9865.2026.01.014 |
| 中文关键词: 非黏结柔性管 端部配件 密封系统 应力松弛 数值模拟 |
| 英文关键词:unbonded flexible pipe end fitting sealing system stress relaxation numerical simulation |
| 基金项目:科技部重点研发计划青年科学家项目（2023YFC2811600）；国家自然科学基金基础研究中心项目（52088102） |
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| 中文摘要: |
| 在海洋油气开发项目中，运输油气的非黏结柔性管通过两端的端部配件与其他结构相连接。端部配件针对非黏结柔性管的各层有不同的固定结构，其中护套层需要与端部配件的主体结构、楔形密封环以及密封法兰相连以实现密封功能。在柔性管实际工作的高温环境中，护套层材料会发生应力松弛现象，影响柔性管端部密封性能。首先进行高分子材料的拉伸试验和应力松弛试验，辨识相关的材料参数；然后利用非线性有限元软件建立柔性管端部密封系统的局部有限元模型，模拟密封系统中法兰环推动金属楔形环挤压护套层材料产生接触压力的全过程；最后讨论护套层的应力松弛及其时长、所承受轴向载荷对密封性能的影响。结果表明：护套层的应力松弛现象将会使得密封系统的接触压力下降34.5%~40.1%，且接触应力的下降在管道安装后的短时间内比较迅速，随着时间延长而逐渐变慢；护套层的轴向载荷对密封性能的影响不大。 |
| 英文摘要: |
| In offshore oil and gas development projects, unbonded flexible pipes for transporting oil and gas are connected to other structures by end fittings at both ends. The end fitting has different structures designed to fix the various layers of the unbonded flexible pipe. In the end fitting, the sheath layer interacts with the fitting body, wedge sealing ring, and sealing flange to achieve the sealing function. Under the high-temperature environment in which the flexible pipe operates, stress relaxation occurs in the sheath layer material, affecting the sealing performance of the pipe end. Firstly, tensile and stress relaxation tests of polymer materials are conducted to identify the relevant material parameters. Then, nonlinear finite element software is used to establish a local finite element model of the flexible pipe end sealing system. The entire process of the flange ring pushing the metal wedge ring to compress the sheath layer material and generate contact pressure in the sealing system is simulated. Finally, the stress relaxation behavior is introduced into the operation process to examine the effects of sheath layer stress relaxation, its duration, and the axial load. The results show that the stress relaxation of the sheath layer causes a 34.5%~40.1% reduction in the contact pressure of the sealing system, with the decrease occurring relatively quickly shortly after pipeline installation, and then slowing over time; the axial load of the sheath layer has little influence on sealing performance. |
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