A new shakedown evaluation method for design of thermo-expanded piping-vessel combined system

IF 3.5 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping Pub Date : 2025-07-09 DOI:10.1016/j.ijpvp.2025.105604

Zhengchi Li , Chenghong Duan , Xiangpeng Luo , Weimin Wang , Mingwan Lu , Zhiwei Chen

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Abstract

Due to elastic follow-up, the stresses in vessels caused by the connected thermo-expanded piping are considered as load-controlled stresses, and evaluated by using the primary stress criterion in current codes. However, it is well-known that this approach is conservative. A new shakedown evaluation method for thermo-expanded piping-vessel combined system is proposed in this paper by comparing three calculation methods of shakedown loads (cyclic elastic-plastic finite element method, lower-bound shakedown theorem method, and dual limit load method) and three safety evaluation criteria (primary stress criterion, 3S criterion, and double elastic limit load criterion). The proposed method adopts integral elastic stress analysis and the double elastic limit load criterion, which not only safely prevents excessive plastic deformation in vessels caused by the elastic follow-up of piping, but also significantly enhances the allowable load of the structure. Examples demonstrate that current codes for evaluating thermo-expanded piping-vessel system are overly conservative.

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一种新的热膨胀管-容器组合系统安定性评价方法

由于弹性随动，连接的热膨胀管在容器内产生的应力被认为是荷载控制应力，并采用现行规范中的主应力准则进行计算。然而，众所周知，这种方法是保守的。通过对三种安定载荷计算方法（循环弹塑性有限元法、下界安定定理法、双极限载荷法）和三种安全评价准则（主应力准则、3S准则、双弹性极限载荷准则）的比较，提出了一种新的热膨胀管-容器组合系统安定载荷评价方法。该方法采用整体弹性应力分析和双弹性极限荷载准则，既能安全地防止管道弹性随动引起的容器过度塑性变形，又能显著提高结构的许用荷载。实例表明，现行的热膨胀管-容器系统评价规范过于保守。

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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.