Failure mechanism of unequal parameters metal bellows under repeated bending process

Hao, Zengliang; Luo, Junting; Chen, Lihuan; Cai, Yi; Chen, Yuhang; Cheng, Muzheng

doi:10.1016/j.engfailanal.2021.105671

Cited by 18 publications

(6 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Metal bellows are thin-walled axisymmetric shells composed of a series of ring-shaped convolutions, which have the flexibility to absorb irregular expansion and contraction caused by axial force, external pressure and bending moments in the piping system [1]. Metal bellows usually possess higher pressure and buffer capacity than ordinary straight pipes, especially in the working conditions of the forced axial and bending displacement [2,3]. They have been widely applied as expansion joints, flexible connectors, pressure relief valves and energy-absorbing components in vacuum systems, aerospace industries, micro-electromechanical systems, etc., playing an important role in weight reduction, strength improvement and energy absorption [4].…”

Section: Introductionmentioning

confidence: 99%

Local Buckling-Induced Forming Method to Produce Metal Bellows

Zhang

Li²,

et al. 2023

Chin. J. Mech. Eng.

View full text Add to dashboard Cite

A novel buckling-induced forming method is proposed to produce metal bellows. The tube billet is firstly treated by local heating and cooling, and the axial loading is applied on both ends of the tube, then the buckling occurs at the designated position and forms a convolution. In this paper, a forming apparatus is designed and developed to produce both discontinuous and continuous bellows of 304 stainless steel, and their characteristics are discussed respectively. Furthermore, the influences of process parameters and geometric parameters on the final convolution profile are deeply studied based on FEM analysis. The results suggest that the steel bellows fabricated by the presented buckling-induced forming method have a uniform shape and no obvious reduction of wall thickness. Meanwhile, the forming force required in the process is quite small.

show abstract

Section: Introductionmentioning

confidence: 99%

Local Buckling-Induced Forming Method to Produce Metal Bellows

Zhang

Li²,

et al. 2023

Chin. J. Mech. Eng.

View full text Add to dashboard Cite

show abstract

“…The existing reliability analysis methods for non-welded metal bellows may provide a reference in this regard. Zeng et al [11] used ABAQUS finite element software. They studied the performance of EPMB metal bellows and corrugated metal pipes subjected to the limited bending stress distribution in a repeating process.…”

Section: Introductionmentioning

confidence: 99%

A Method for Calculating the Reliability of Welded Metal Bellows for Mechanical Seals

Zhong

Sun

et al. 2022

Coatings

View full text Add to dashboard Cite

Welded metal bellows are an elastic element widely used in the field of mechanical seals. The main objective of the present study was to investigate the reliability of welded metal bellows in mechanical seals under specified working conditions. To this end, a stress relaxation test bench was built to obtain the residual elastic force data of welded metal bellows under different compression loads in high-temperature environments. Then, the elastic force loss equation of the bellows was fitted. Moreover, a failure judgment form of welded metal bellows in the mechanical seal is proposed. According to the calculation relationship between the seal face pressure and the welded metal bellows’ elastic force, the elasticity force loss range of the bellows was 556–708 N. Finally, according to the elastic force loss equation, elastic force loss was determined. The maintenance time of the welded metal bellows, and the bellow’s failure limit state equation were determined, and the limit state equation was substituted into the center point method. The reliability of the welded metal bellows was 0.9958. The results show that the new failure criterion and the center point reliability calculation method proposed in this paper have certain practical value for the rapid reliability prediction of welded metal bellows.

show abstract

“…The existing reliability analysis methods for non-welded metal bellows under failure conditions can provide a certain reference for stress relaxation studies. For example, Zeng [8] used the ABAQUS finite element software to perform a numerical simulation of EPMB metal bellows. In the study, a metal corrugated pipe was studied to predict the limit bending stress distribution.…”

Section: Introductionmentioning

confidence: 99%

Reliability Analysis of the Welded Bellows for Mechanical Seals Based on Six Sigma

Zhang

Sun

et al. 2022

Metals

View full text Add to dashboard Cite

This paper investigates the reliability of welded metal bellows used in mechanical seals under specified working conditions. Firstly, considering the working environment of mechanical seals and the structural characteristics of welded metal bellows, a stress relaxation test bench was developed to obtain projectile loss data of welded metal bellows under different compression loads at elevated temperatures. The creep constants for a stress relaxation simulation were derived from the experimental data, and a stress relaxation finite element analysis (FEA) of the bellows was conducted using Workbench under different compression loads. We found that the stress relaxation simulation of welded metal bellows can accurately simulate the relaxation characteristics of welded metal bellows. The reliability of the welded metal bellows was calculated using Six Sigma response surface reliability by taking the material properties and compression load as variable parameters and the residual elasticity of the bellows as the objective function. We concluded that the reliability calculation method of welded metal bellows promotes reliability research into welded metal bellows for mechanical seals.

show abstract

Failure mechanism of unequal parameters metal bellows under repeated bending process

Cited by 18 publications

References 21 publications

Local Buckling-Induced Forming Method to Produce Metal Bellows

Local Buckling-Induced Forming Method to Produce Metal Bellows

A Method for Calculating the Reliability of Welded Metal Bellows for Mechanical Seals

Reliability Analysis of the Welded Bellows for Mechanical Seals Based on Six Sigma

Contact Info

Product

Resources

About