A multi-scale finite element contact model for seal and assembly of twin ferrule pipeline fittings

Yan, Yangyang; Zhai, Jingyu; Gao, Peixin; Han, Qingkai

doi:10.1016/j.triboint.2018.04.028

Cited by 18 publications

(13 citation statements)

References 16 publications

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“…is paper and reference [25] belong to a part of systematic research on the sealing characteristics of pipeline fittings, and the differences and innovations are as follows:…”

Section: Multiscale Modeling Methods Considering Fluidmentioning

confidence: 99%

“…(1) Based on the multiscale modeling method of pipeline fittings in reference [25], this paper analyzes the influence of high-pressure fluid load on the sealing characteristics of pipeline fittings in depth and in detail through more accurate quantification and analysis methods of sealing characteristics of different pipeline fitting materials. It can be concluded that the high-pressure fluid has a significant impact on the contact state of the sealing area of pipeline fittings, and highpressure fluid can improve the sealing reliability of pipeline fittings.…”

Section: Multiscale Modeling Methods Considering Fluidmentioning

confidence: 99%

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Influence of Fluid on Seal and Assembly of Pipeline Fittings Based on the Multiscale Finite Element Model

Yan

Fan

2020

Complexity

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Pipeline fittings with ferrules are applied to connect sections of hydraulic pipelines in aircraft, and their reliability and stability are essential. This paper aims at investigating the influence of internal fluid on the sealing characteristics of pipeline fittings by employing the multiscale model. Changes in the sealing characteristics induced by the fluid pressure switch are studied, and the assembly method under the internal fluid is also explored. The calculated results show that the multiscale model can accurately reflect the changes in the sealing area, and the high-pressure fluid can enhance the sealing reliability. Compared with the contact area, the fluid pressure exerts a greater influence on the change in the area of the high-stress zone. Furthermore, the unrestored sealing area enlarges with the increased maximum fluid pressure, and the change in the area of the high-stress zone is significantly larger than that in the contact area. Moreover, the optimum assembly position of ferrule decreases with the increase in fluid pressure, thus achieving the excellent sealing characteristics.

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“…is paper and reference [25] belong to a part of systematic research on the sealing characteristics of pipeline fittings, and the differences and innovations are as follows:…”

Section: Multiscale Modeling Methods Considering Fluidmentioning

confidence: 99%

Section: Multiscale Modeling Methods Considering Fluidmentioning

confidence: 99%

Influence of Fluid on Seal and Assembly of Pipeline Fittings Based on the Multiscale Finite Element Model

Yan

Fan

2020

Complexity

Self Cite

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“…The first one corresponds to a (periodic) self-affine fractal topography, which has been generated using the same method as in [24]. The topography has been generated in a domain of 1 mm × 1 mm and discretized with 2 12 × 2 12 points. The Hurst exponent has been taken as 0.8 and the root mean square (rms) value of heights as 1 µm.…”

Section: Two Case Examplesmentioning

confidence: 99%

“…However, metal-to-metal seals must be used whenever extreme thermal or pressure conditions are to be faced [1,2], as is the case in casing connections in oil wells [3][4][5][6][7][8] and pressure relieve valves [9,10]. Other fields in which metal-to-metal seals can be found include space recovery [11], aviation [12], nuclear power plants [2] or refrigeration systems for cryomagnets [13]. Common to these applications is that leakage can be hazardous for the environment or affect the performance of critical systems.…”

Section: Introductionmentioning

confidence: 99%

An Enhanced Stochastic Two-Scale Model for Metal-to-Metal Seals

Pérez-Ràfols

Almqvist

2018

Lubricants

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Leakage in static metal-to-metal seals is predominantly determined by the topography of the contacting surfaces. The topography consists of features that span the entire range from its carefully engineered geometry down to micro-sized surface asperities. The mesh density necessary to fully resolve all the features, in this large span of length scales, generates too many degrees of freedom for a direct numerical approach to be applicable. Some kind of sophistication, either incorporated in the mathematical model or in the numerical solution procedure or even a combination of both is therefore required. For instance, in a two-scale model, the geometrical features can be addressed in the global-scale model, while the features belonging to length scales smaller than a given cut-off value are addressed in the local-scale model. However, the classical two-scale approaches do not explicitly address the stochastic nature of the surfaces, and this has turned out to be a requirement in order to obtain quantitative predictions of leakage in metal-to-metal seals. In this work, we present a continued development of an already existing two-scale model, which incorporates a stochastic element. The novelty lies in the way we characterise the permeability at the local scale and how this is used to build a more efficient and useful approach.

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“…This phenomenon plays an important role in the reliability of mechanical joint, stability of elastohydrodynamic lubrication, accumulation of wear, etc. In order to obtain the mechanical properties of contact between rough surfaces, several mechanical models have been developed, such as the statistical model, the fractal model, the multi-scale model, 1,2 the finite element model, 3,4 etc. The statistical model and the fractal model have been widely applied to different engineering fields.…”

Section: Introductionmentioning

confidence: 99%

A fractal model of contact between rough surfaces for a complete loading–unloading process

Yuan

Zhao

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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The mechanical properties of contact between rough surfaces play an important role in the reliability of the electromechanical system. In order to improve the design accuracy of precision instruments, an elastic-plastic contact model for three-dimensional rough surfaces based on the fractal theory is developed for a complete loading–unloading process based on the Majumdar and Bhushan model. The truncation size distribution functions of asperities for different values of asperity level in the loading process are given. Relationships between true contact area and total contact load in the complete loading–unloading process are obtained according to the truncation size distribution functions of asperities. The results show the range of asperity levels has significant effects on contact mechanical behaviors of fractal rough surfaces. When the first six levels of asperities do not exceed the critical elastic level, the fractal rough surfaces exhibit elastic behavior in a complete contact process, and the load–area relationships in the loading and unloading processes are coincident approximately. When the critical elastic level is less than the minimum level of asperity, the inelastic deformation begins to appear in fractal rough surfaces and the true contact area during the unloading process is always greater than the true area during the loading process for a given total contact load. In comparison with the K-K-E model, the present model is proved to be reasonable.

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A multi-scale finite element contact model for seal and assembly of twin ferrule pipeline fittings

Cited by 18 publications

References 16 publications

Influence of Fluid on Seal and Assembly of Pipeline Fittings Based on the Multiscale Finite Element Model

Influence of Fluid on Seal and Assembly of Pipeline Fittings Based on the Multiscale Finite Element Model

An Enhanced Stochastic Two-Scale Model for Metal-to-Metal Seals

A fractal model of contact between rough surfaces for a complete loading–unloading process

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