Mathematical description and mechanical characteristics of reinforced S-shaped bellows

Yuan, Zhe; Huo, Shihui; Ren, Jianting

doi:10.1016/j.ijpvp.2019.103931

Cited by 21 publications

(9 citation statements)

References 6 publications

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“…Prasanna et al [11] studied the effects of wall thickness, corrugation and convolution radius on the static mechanical characteristics of circular-type bellows. Yuan et al [12] put forward a theoretical analysis of reinforced S-shaped bellows and discussed the mechanical behavior of bellows under different loads. Huo et al [13] studied the bending performance of reinforced S-shaped bellows under a pressured load by a mathematical method and numerical simulation analysis.…”

Section: Introductionmentioning

confidence: 99%

Correction Method for the Bending Characteristics of Aero Ball Joints under High Temperature and High Pressure

et al. 2022

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The aero ball joint is pivotal in aircraft duct systems due to its favorable properties, including displacement compensation and flexibility. In the stress assessment of air ducts, ball joints are usually simplified by using “Joints” connections to reduce the convergence problems caused by non-linearity, which requires a high degree of accuracy in the characteristic parameters of the ball joint. Accordingly, this paper builds a high temperature and pressure fatigue test platform to investigate the bending characteristics of the ball joint at different temperatures and pressures and points out the limitations of the current method. Then, a method combining finite element analysis (FEA) and the BP neural network is proposed to obtain the characteristic parameters of the ball joint. The results showed that the bending process of the ball joint tended to have two typically different stiffness properties, which were high rigidity and low rigidity. The bending characteristics were strongly influenced by pressure, but less influenced by temperature. The existing test platform increased the force reaction at the contact areas of the ball joint, resulting in errors in the measurement of characteristic parameters. The BP neural network prediction method could effectively alter the ball joint properties and reduce errors.

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Section: Introductionmentioning

confidence: 99%

Correction Method for the Bending Characteristics of Aero Ball Joints under High Temperature and High Pressure

et al. 2022

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“…In recent years, researchers have studied waveform structure design, bending performance, fatigue failure and failure prevention of metal bellows. [6][7][8] Silva et al 9 analysed the pits and cavities contained in the stainless steel used for bellows and the influence on the performance of the bellows after the pits and cavities further expanded during the forming process. Garrido et al 10 considered the size, load and nonstandard trapezoidal shape of bellows and developed an optimization tool to optimize the mass and length of the bellows and identified a valid range of bellows parameters to fulfil the design constraints.…”

Section: Introductionmentioning

confidence: 99%

Ultimate bending performance and fatigue life of U-shaped metal bellows

Hao

Chen

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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Metal bellows used in the flexible connection of metallurgical converter oxygen lance compensates for pipeline displacement through its bending deformation, and adjacent waveforms in the concentrated deformation area are squeezed, resulting in premature fracture. The bending geometric model of U-shaped metal bellows is established in this paper, and the geometric relationship between waveform structure parameters and ultimate bending radius is derived. Moreover, a mathematical model of bending moment (M) with bending angular displacement (θ) about wave height H and wave crest fillet radius Rc is established. Then, combined with Fe-safe fatigue life analysis software, the fatigue life and failure location of metal bellows are obtained. The optimal waveform parameter design range of DN80 metal bellows with high repeated bending fatigue life under large bending is determined. Finally, the bending performance and fatigue life of bellows are tested on a bending fatigue testing machine. The distribution law of fatigue life and the propagation law of cracks at the wave trough of metal bellows under different bending angular displacement amplitudes are obtained. The crack propagation mechanism and fracture mechanism under different displacement amplitudes are revealed by a scanning electron microscope. In the engineering application of large bending, the pipeline failure caused by the ultimate bending deformation of metal bellows can be avoided according to the prediction results of fatigue life.

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“…He found that as the elongation increases, the number of cycles decreases, and the numerical estimation is lower than the experimental results and the localization of the crack weak area can be detected. Yuan [4] proposed a mathematic description of the reinforced Sshaped bellows and discussed the mechanical characteristics under internal pressure, forced axial, and bending displacement. He found that the pressure capability of the bellows decreases slightly with the increase of the number of layers, but the decrease is limited and the S-shaped bellows tends to have weak nonlinear characteristics under axial tensile.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Experimental Study on Axial Stiffness and Stress Deformation of the Braided Corrugated Hose

Huang

Zhang

2021

Applied Sciences

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To explore the mechanical properties of the braided corrugated hose, the space curve parametric equation of the braided tube is deduced, specific to the structural features of the braided tube. On this basis, the equivalent braided tube model is proposed based on the same axial stiffness in order to improve the calculational efficiency. The geometric model and the Finite Element Model of the DN25 braided corrugated hose is established. The numerical simulation results are analyzed, and the distribution of the equivalent stress and frictional stress is discussed. The maximum equivalent stress of the braided corrugated hose occurs at the braided tube, with the value of 903MPa. The maximum equivalent stress of the bellows occurs at the area in contact with the braided tube, with the value of 314MPa. The maximum frictional stress between the bellows and the braided tube is 88.46MPa. The tensile experiment of the DN25 braided corrugated hose is performed. The simulation results are in good agreement with test data, with a maximum error of 9.4%, verifying the rationality of the model. The study is helpful to the research of the axial stiffness of the braided corrugated hose and provides the base for wear and life studies on the braided corrugated hose.

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Mathematical description and mechanical characteristics of reinforced S-shaped bellows

Cited by 21 publications

References 6 publications

Correction Method for the Bending Characteristics of Aero Ball Joints under High Temperature and High Pressure

Correction Method for the Bending Characteristics of Aero Ball Joints under High Temperature and High Pressure

Ultimate bending performance and fatigue life of U-shaped metal bellows

Numerical Simulation and Experimental Study on Axial Stiffness and Stress Deformation of the Braided Corrugated Hose

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