Structural assumption on design of rounded rectangular bellows under pressure

IF 3 2区工程技术 Q2 ENGINEERING, MECHANICAL International Journal of Pressure Vessels and Piping Pub Date : 2024-07-03 DOI:10.1016/j.ijpvp.2024.105256

Mingxuan Lu , Jian Ge , Yue Xie , Zheng Gong , Sumei Liu , Zhengliang Li

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Abstract

Bellows is a flexible component whose volume can be changed by compression or expansion under pressure. Rounded rectangular type bellows is most applied where the internal space of application is strict. The Expansion Joint Manufacturers Association (EJMA) code is world-recognized code for design by formulas method. However, the calculation formulas of stress and deformation in EJMA code does not consider the shape of corner. Therefore, this study proposed a structural assumption of curved beam model to calculate the stress and deformation for rounded rectangular bellows under pressure load by formula calculation method. A parametric study by means of finite element analysis (FEA) was performed to assess the impact of different structural parameters and the applicable scope was investigated. The experimental and numerical results showed that the proposed method can obtain a suitable precision and safe result when ratio of wave height to corner radius is lower than 35 % and the ratio of length of short side length to corner radius is in range 5–20. This study will enrich existing bellows design code and help industry designers to accelerate the optimization iteration in preliminary design stage instead of FEA.

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压力下圆形矩形波纹管设计的结构假设

波纹管是一种柔性部件，其体积可在压力作用下通过压缩或膨胀而发生变化。圆角矩形波纹管多用于内部空间要求严格的场合。膨胀节制造商协会（EJMA）规范是世界公认的采用公式法进行设计的规范。然而，EJMA 规范中的应力和变形计算公式并未考虑转角的形状。因此，本研究提出了曲线梁模型的结构假设，以公式计算法计算压力荷载作用下圆角矩形波纹管的应力和变形。通过有限元分析（FEA）进行了参数研究，以评估不同结构参数的影响和适用范围。实验和数值结果表明，当波高与转角半径之比小于 35%，短边长度与转角半径之比介于 5-20 之间时，所提出的方法可获得适当的精度和安全结果。这项研究将丰富现有的波纹管设计代码，并帮助工业设计人员在初步设计阶段代替有限元分析加速优化迭代。

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来源期刊

International Journal of Pressure Vessels and Piping 工程技术-工程：机械

CiteScore

5.30

自引率

13.30%

发文量

208

审稿时长

17 months

期刊介绍： Pressure vessel engineering technology is of importance in many branches of industry. This journal publishes the latest research results and related information on all its associated aspects, with particular emphasis on the structural integrity assessment, maintenance and life extension of pressurised process engineering plants. The anticipated coverage of the International Journal of Pressure Vessels and Piping ranges from simple mass-produced pressure vessels to large custom-built vessels and tanks. Pressure vessels technology is a developing field, and contributions on the following topics will therefore be welcome: • Pressure vessel engineering • Structural integrity assessment • Design methods • Codes and standards • Fabrication and welding • Materials properties requirements • Inspection and quality management • Maintenance and life extension • Ageing and environmental effects • Life management Of particular importance are papers covering aspects of significant practical application which could lead to major improvements in economy, reliability and useful life. While most accepted papers represent the results of original applied research, critical reviews of topical interest by world-leading experts will also appear from time to time. International Journal of Pressure Vessels and Piping is indispensable reading for engineering professionals involved in the energy, petrochemicals, process plant, transport, aerospace and related industries; for manufacturers of pressure vessels and ancillary equipment; and for academics pursuing research in these areas.