【摘要】 EJMA或GB/T 12777—2019《金属波纹管膨胀节通用技术条件》标准中关于矩形波纹管膨胀节挠度的计算基于单边梁模式，没有考虑邻边的影响，结果和实际挠度相差甚远。首先通过有限元计算单条直边段波纹管在压力作用下的挠度，并基于计算结果对标准中的挠度计算公式进行修正，考虑了波高和长度的影响；然后建立了单斜接角矩形波纹管有限元分析模型，计算了内压作用下的长边最大挠度，发现该挠度受短边影响很大，为此再次对单条直边段波纹管挠度计算公式进行了修正，引入了短边影响，并最终得到了单斜接角矩形波纹管挠度计算公式，为该形式波纹管的精准工程设计提供了重要参考。更多还原

【Abstract】 In EJMA or GB/T 12777—2019 General specification for metal bellows expansion joints, the deflection calculation of rectangular bellows’ expansion joints takes the single-sided beam mode as base and does not take the influence of adjacent sides into account. The calculation result is quite different from the actual deflection. In this paper, through making use of the finite element method, the deflection of a single straight-edge bellows under pressure was calculated and the deflection calculation formula stipulated in the standard was modified based on the calculation results, including having the influence of wave height and length taken into account and a finite element analysis model of the single inclined angle rectangular bellows established. The results show that, the maximum deflection of the long side under the action of internal pressure is greatly affected by the short side. Considering this, the deflection calculation formula for a single straight-edge bellows was revised again, introducing the influence of the short side. Eventually, the precise deflection calculation formula was obtained, which provides an important reference for the engineering design of this type of bellows.更多还原