Strength of U-Shaped Bellows : 4th Report, Limit Analysis under Axial Loading

実, 浜田; 茂男, 竹園

doi:10.1299/kikai1938.32.569

Cited by 4 publications

(1 citation statement)

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“…11 The stiffness and stress distribution of bellows both reflect the mechanical properties, so the research on them is often inter-related. Hamada et al used the shell theory to calculate the stress and deformation of the bellows [11][12][13][14][15] ; Chien and Wu calculated them based on the method of perturbation 16 ; Wen et al studied the influence of parameters (thickness, pitch, etc.) on stiffness and strengthening by the finite element method (FEM).…”

Section: Introductionmentioning

confidence: 99%

The optimization of bellows convolutions in bellows pump for better stress distribution

Gao

Ruan

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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Bellows pump has been widely used for chemical transportation with excellent elasticity and seal ability of the core component bellows. Nevertheless, for repeated alternating compression and expansion, bellows convolutions, that is, the maximum stress points, are at risk of fatigue rupture, which leaves a safety hazard for practical applications. Though a special bellows shape with non-constant wall thickness was proposed as an effective method to strengthen the convolutions, it also affects other characteristics of bellows, such as stiffness, single-stroke displacement, and size, which are equally important for the bellows pump. This article designs a fine-tuned convolution structure on the premise of avoiding its effect on volume properties of bellows. Limiting the value of variables by the stability of bellows stiffness, the structure parameters are optimized with the combination of the finite element method (FEM) and whale optimization algorithm. To ensure the accuracy of the FEM, the stress–strain curve of bellows material and the bellows axial stiffness is measured. Finally, digital image correlation is employed to obtain the strain at convolutions before and after the optimization, and the significant reduction of the strain verifies the effectiveness of the optimization. We believe that this method is valuable for optimizing stress distribution and guiding the design of longer-life pump bellows.

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