A leakage channel model for sealing interface of mechanical face seals based on percolation theory

Sun, Jun; Ma, Chongfang; Lu, Jingwan; Yu, Qiuping

doi:10.1016/j.triboint.2017.09.013

Cited by 22 publications

(19 citation statements)

References 13 publications

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“…With the rapid development of mechanical manufacturing, the sealing materials in these industries are facing higher and stricter requirements, hence the preparation of novel sealing materials have become a new challenge. [1][2][3] It is well known that polytetrafluoroethylene (PTFE) has unique properties, such as high temperature, thermal stability, and excellent chemical resistance, which is due to high bond energy of carbon-fluorine. 4 However, the strong C F bond energy leads PTFE has no react with any other chemical groups, which can make PTFE molecular chains slip easily.…”

Section: Introductionmentioning

confidence: 99%

Effect of tensile rates on thermal and mechanical properties of porous PTFE composites

Kou

Pan

et al. 2019

J of Applied Polymer Sci

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To achieve polymer‐matrix composites for sealing materials with thermostability and toughness, PTFE composites filled with short glass fibers (SGFs) were hyperthermal stretched to prepare a substrate material with high thermal stability and porosity. The effects of various tensile rates on the thermal and mechanical properties and morphologies were investigated. The results revealed that the thermal stability could be improved slightly and the thermal expansion coefficient of composites increased by the tensile rate. Through observing the morphologies, tensile process produced cavities and the increased tensile rate had negligible effects on porosity, which also could be proved by density test. From mechanical properties analysis, stretched composites exhibited that the tensile strength increases first and then decreases with the increased tensile rate. Although the variation tendency of Young's modulus is similar to that of tensile strength, which is smaller than that of unstretched composite. When the tensile rate reached 50 mm·min−1, the tensile strength and Young's modulus of the stretched composites increased by 65 and 9% to maximum, respectively. Meanwhile, elongation at break and shore hardness decreased. The thermal and mechanical properties improvement could be ascribed to the strain‐induced crystallization and crystal alignment. In addition, the interplanar spacing and grain size were inversely proportional to the tensile rate. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 48175.

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Section: Introductionmentioning

confidence: 99%

Effect of tensile rates on thermal and mechanical properties of porous PTFE composites

Kou

Pan

et al. 2019

J of Applied Polymer Sci

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“…The reason may be that the sealing interface was a porous interface model with great difference in length, width, and height. According to the percolation theory, [ 29 ] when the pore micro cube unit reached a certain value, the pores will aggregate with each other to form clusters, and the sealing medium may flow from the high‐pressure side to the low‐pressure side of the sealing porous interface, resulting in leakage. When the nitrogen was infused into seal chamber, the impurities entered into capillary tube inside the gasket and the flange surface.…”

Section: Resultsmentioning

confidence: 99%

Sealing characteristics of aramid fiber reinforced rubber gasket with scratch depth and width defects

Zhang

Xiang

et al. 2023

Polymer Composites

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Non-asbestos gaskets have high tensile properties, good permeability resistance, and resilience. Compared with traditional asbestos gaskets, non-asbestos gaskets have the advantages of less pollution and no harm to human body. This manuscript presented an experimental and theoretical study of aramid fiber reinforced non-asbestos gaskets. The tensile strength of gaskets with different fiber orientations and tensile rate were conducted in order to meet the industrial standard. The leakage rates of nondestructive non-asbestos gaskets with different sizes under different medium pressures and pretightening load were investigated. The results showed that the leakage rate can reach the industrial standard when the pretightening load reached 30 MPa and medium pressures was less than 2 MPa. The artificial scratch defects were made on non-asbestos gaskets, and the effect of the width and depth of the scratch defect on leakage rate was further investigated. The sealing failure would occur when the scratch depth reached 0.1 mm. The modified model containing defect factors was established. The results showed that the modified model can well characterize leakage rate of gasket.

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“…The size of the roughness determines the height of the gap that forms the interface (figure 10) [26]. As the roughness increases, the height and volume of the gap between the interfaces increase, and the number of leakage channels also increases [13], so the leakage rate increases. Therefore, leakage can be delayed by reducing the surface roughness of the sealing surfaces, selecting the appropriate direction of the grinding scars, and increasing the contact pressure.…”

Section: Surface Roughnessmentioning

confidence: 99%

“…Theoretical investigations on static seals mainly focus on contact modeling, which is established via Hertz contact theory [10], statistical G-W contact model [11], fractal theory based M-B contact model [12], or two-dimensional percolation grid model [13][14][15][16][17]. In these models, the sealing interface is simplified to a contact surface between a rigid plane and a rough surface, and the height characteristics of the surfaces are ignored [18,19].…”

Section: Introductionmentioning

confidence: 99%

Effect of surface topography and roughness on the leakage of static seals

Gu,

Dai,

Huang

et al. 2024

Surf. Topogr.: Metrol. Prop.

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Static seal is widely used in modern machinery. Leakage of static seals would shorten the mechanical system’s service life and affect the environment. To understand the leakage characteristics of static seals, in this work, an experimental apparatus for leakage quantization was built. The effects of surface topography and roughness on the leakage performance of static seals subject to elevated pressure were highlighted. It was found that the leakage rate is negatively correlated with contact pressure. Orientation of surface topography affects the leakage, where the grinding scar parallel to the leakage direction contributes to the leakage, and the perpendicular grinding scar has an inhibiting effect. The leakage rate of irregular and discontinuous surface topography is lower than that of regular ones, and it increases with increasing surface roughness. Furthermore, the leakage mechanism of surface topography and roughness was revealed. This work provides general guidance for the parameters design of static seals.

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A leakage channel model for sealing interface of mechanical face seals based on percolation theory

Cited by 22 publications

References 13 publications

Effect of tensile rates on thermal and mechanical properties of porous PTFE composites

Effect of tensile rates on thermal and mechanical properties of porous PTFE composites

Sealing characteristics of aramid fiber reinforced rubber gasket with scratch depth and width defects

Effect of surface topography and roughness on the leakage of static seals

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