| 余晓峰，张金伟，李兆旭，徐万海.LNG薄膜板冲压成形有限元模拟与残余应力特征分析[J].海洋工程,2025,(3):184~193 |
| LNG薄膜板冲压成形有限元模拟与残余应力特征分析 |
| Finite element simulation and residual stress characteristic analysis for stamping forming of LNG corrugated membrane panels |
| 投稿时间：2024-04-23 修订日期：2024-07-08 |
| DOI：10.16483/j.issn.1005-9865.2025.03.017 |
| 中文关键词: LNG 薄膜板 有限元模拟 冲压仿真 残余应力 |
| 英文关键词:LNG membrane panel finite element simulation stamping simulation residual stress |
| 基金项目:国家自然科学基金资助项目（51979163）；国家石油天然气管网集团有限公司科学研究与技术开发项目（SJSG202207） |
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| 中文摘要: |
| 波纹型薄膜板是液化天然气（liquefied natural gas，简称LNG）储罐的关键部件，其残余应力状态是影响结构安全的重要因素。利用Abaqus有限元软件，对波纹型LNG薄膜板单个交叉节点进行分步冲压仿真模拟，以探究其残余应力分布特征。主要难点在于交叉节点处的模具缺乏详细的参考说明，需要自行设计；此外，压型过程涉及大变形，受到材料非线性、几何非线性的综合影响，计算难度大。通过选择适用的板材并设计模具，成功实现了LNG模板冲压成形的仿真模拟，并获得了符合规范要求的构件形式。研究发现：仿真模型能够准确反映实际残余应力分布情况，交叉褶皱区域的残余应力最大，平直板区域几乎没有残余应力，波纹波峰处的残余应力沿着波纹方向无明显变化。研究结论可为了解和掌握波纹型LNG薄膜板的承载特性提供重要参考。 |
| 英文摘要: |
| Corrugated membrane panels are critical components of liquefied natural gas (LNG) storage tanks, and their residual stress state is a key factor affecting structural safety. This study employs the Abaqus finite element software to conduct stepwise stamping simulation of a single intersection node in a corrugated LNG membrane panel, aiming to investigate its residual stress distribution characteristics. The main challenge lies in the lack of detailed references for the die design at the intersection node, requiring independent design efforts. Additionally, the stamping process involves large deformations, posing significant computational difficulties due to the comprehensive influence of material and geometric nonlinearities. By selecting suitable sheet materials and designing an appropriate die, this study successfully achieves simulation and obtains a component form that meets regulatory requirements. The findings indicate that the simulation model accurately reflects the actual residual stress distribution, with the highest residual stress concentrated in the cross-wrinkle region, negligible residual stress in the flat and straight panel areas, and no significant variation in residual stress along the corrugation direction at the corrugated peaks. These conclusions provide valuable insights for understanding the load-bearing characteristics of corrugated LNG membrane panels. |
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