Partially open crack model for leakage pressure analysis of bolted metal-to-metal flange

Beghini, Marco; Bertini, Leonardo; Santus, Ciro; Guglielmo, Alberto; Mariotti, Gabriele Virzi’

doi:10.1016/j.engfracmech.2015.06.005

Cited by 11 publications

(6 citation statements)

References 61 publications

(68 reference statements)

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“…Limited experimental test data could be used to build fuzzy models that predict gasket leakage rate and sealing performance [6]. Other researchers predicted the leakage rate of a bolt flange gasket connection by finite element analysis or experimental methods [7][8][9][10]. The effect of the internal fluid operating temperature and pressure on the variation of the bolt load and consequently on the gasket stress in bolted joints was discussed, and the analytical basis of the elastic interaction model and the thermally induced deflections were used to evaluate the load changes.…”

Section: Introductionmentioning

confidence: 99%

Influence of Flange Structure Parameters on Contact Pressure of the New‐Type Wedge Ring Gasket

Wei

2022

Chem Eng & Technol

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As a sealing element, the new‐type wedge ring gasket required the usage of flanges to achieve sealing. On the basis of previous research, the influence of flange structural parameters on the contact pressure of the sealing surface of the new wedge ring gasket was studied by finite element analysis. The effective thickness of the flange had the greatest influence on the contact pressure of the main and slave sealing surfaces, followed by the thickness of the big end of the cone neck, the outer diameter of the flange, and the height of the flange neck. The flange structure parameters were optimized by an orthogonal experiment, and the maximum contact pressure of the sealing surface of the gasket was obtained under optimized conditions. The results provided a basis for the selection of structural parameters of the flange used with the new‐type wedge ring gasket.

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Section: Introductionmentioning

confidence: 99%

Influence of Flange Structure Parameters on Contact Pressure of the New‐Type Wedge Ring Gasket

Wei

2022

Chem Eng & Technol

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“…The failure of the connection system leads to leakage, which produces huge economic losses and causes serious casualties. As one of the three major causes of accidents in the chemical industry, leakage has been widely concerned [ 2 ]. As the core element of sealing in bolted flange connection, the gasket’s performance seriously affects the safety of the equipment.…”

Section: Introductionmentioning

confidence: 99%

Calculation Model of Mechanical and Sealing Properties of NiTi Alloy Corrugated Gaskets under Shape Memory Effect and Hyperelastic Coupling: I Mechanical Properties

Zhu

Liu

et al. 2022

Materials

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NiTi alloy’s shape memory effect provides additional restoring force under temperature loads, making it an ideal material for gaskets. However, its yield stress is too large to form the initial seal. In this paper, by combining the advantages of corrugated structure and NiTi alloy’s shape memory effect, a NiTi alloy corrugated gasket is proposed. Its mechanical properties were studied using experiments and the finite element method. The influences of geometric parameters on gasket performance were discussed. The results show that the shape memory effect can greatly improve the contact stress of gaskets. The corrugation can effectively reduce the pre-tightening force. The contact stress of NiTi alloy corrugated gasket is significantly affected by plate thickness, gasket height, and corrugation pitch and shows a high nonlinear characteristic. The proposed finite element method (FEM) and the gasket contact stress prediction model are accurate and engineering available.

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“…e metal-to-metal seal is performed by a direct-metal/ metal-tight contact of rough surfaces as shown in Figure 1. Although it is simple in structure, the sealing behavior of a metal-to-metal seal is a ected by a variety of factors [7][8][9][10][11], among which the surface topography, which usually has a microstructure given by machining processes, is thought to be one of the most important factors [12][13][14]. Clearly, engineering materials are known to have rough surfaces, and the full control of surface topography at all scales during manufacturing processes is still out of reach [9].…”

Section: Introductionmentioning

confidence: 99%

A Fractal Contact Model for Rough Surfaces considering the Variation of Critical Asperity Levels

Liu

Guo

Chen

et al. 2022

Advances in Materials Science and Engineering

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A contact model for rough surfaces based on the fractal theory is proposed in the present work. Firstly, the deformation of the material is divided into four stages: elastic deformation, the first elastoplastic deformation, the second elastoplastic deformation, and full plastic deformation. And the variation of material hardness is considered when analyzing the contact characteristics of a single asperity within the first and second elastoplastic deformation stages. Secondly, the size distribution function of contact spots at different frequency levels is derived. And the expressions of asperity critical frequency levels are rederived. Lastly, the feasibility and credibility of the proposed model are verified by comparison with other contact models and experimental data. The results show that when the variation of the material hardness is considered, the contact area of a single asperity in the first elastoplastic deformation stage becomes larger, while the contact area of a single asperity in the second elastoplastic deformation stage becomes smaller. Moreover, the critical asperity frequency levels of the rough surface are not constant, but the variables are related to the total real contact area of the rough surface and decrease as the real contact area increases. The proposed model is a modification and improvement of the existing fractal contact models, which can lead to a more accurate relationship between the contact load and the total real contact area of the rough surface.

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Partially open crack model for leakage pressure analysis of bolted metal-to-metal flange

Cited by 11 publications

References 61 publications

Influence of Flange Structure Parameters on Contact Pressure of the New‐Type Wedge Ring Gasket

Influence of Flange Structure Parameters on Contact Pressure of the New‐Type Wedge Ring Gasket

Calculation Model of Mechanical and Sealing Properties of NiTi Alloy Corrugated Gaskets under Shape Memory Effect and Hyperelastic Coupling: I Mechanical Properties

A Fractal Contact Model for Rough Surfaces considering the Variation of Critical Asperity Levels

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