Influence of surface roughness on leakage of new metal gasket (original) (raw)
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Surface Roughness of Flange Contact to the 25A-size Metal Gasket by using FEM Simulation
World Academy of Science, Engineering and Technology, International Journal of Mechanical, Aerospace, Industrial, Mechatronic and Manufacturing Engineering, 2013
The previous study of new metal gasket that contact width and contact stress an important design parameter for optimizing metal gasket performance. The optimum design based on an elastic and plastic contact stress was founded. However, the influence of flange surface roughness had not been investigated thoroughly. The flange has many kinds of surface roughness. In this study, we conducted a gasket model include a flange surface roughness effect. A finite element method was employed to develop simulation solution. A uniform quadratic mesh used for meshing the gasket material and a gradually quadrilateral mesh used for meshing the flange. The gasket model was simulated by using two simulation stages which is forming and tightening simulation. A simulation result shows that a smoother of surface roughness has higher slope for force per unit length. This mean a squeezed against between flange and gasket will be strong. The slope of force per unit length for gasket 400-MPa mode was higher than the gasket 0-MPa mode.
Development of New Metallic Gasket and its Optimum Design for Leakage Performance
Journal of Solid Mechanics and Materials Engineering, 2008
This paper introduces a new all-metal gasket that incorporates strategically located circumferential annular lips that form seal lines with the flanges. This gasket, named Super Seal Gasket, by virtue of its special shape, makes use of the material's spring effect, resulting in sealing performance. This change in approach, from the traditional one based on material development to one of mechanical design, brings with it the need for optimization of the different design parameters for leakage performance. We were able to develop an optimization methodology for this new product using the Taguchi method. As a test case, a 25A sized industrial gasket was optimized using this methodology. In FEM analysis, contact stress and deformation information was used to quantify leaking. Helium leak testing reveals considerable improvement in the sealing performance, hence verifying the applicability of the methodology developed. This work has proved that material development is not the only approach towards the development of new, more effective gaskets and novel gaskets, such as the one introduced in this study, have a useful part to play in the sealing of flanged joints.
Sealing Performance Layered Metal Gasket Based on the Simulation Method
TEKNIK, 2020
Studies for corrugated metal gaskets are still ongoing to improve its performance. This is considered to be a single gasket with SUS304 material when contact with flanges that have greater surface roughness, reduced contact width and plastic deformed contact surfaces are incomplete and cannot fill the surface roughness of flanged flanges. The use of softer material than the base material as a surface covering material is used to improve the performance of the gasket. In this study, therefore the effect of modulus of elasticity ratio and thickness ratio on contact width and contact stress, 25A three-layer metal gasket was investigated using Finite Element Analysis. The results showed that the material with tangent modulus, Ehal = Eal / 150 had the highest slope for contact width. While the contact width of the plastic mode gasket is higher than the elastic mode gasket.
A new solution of the semi-metallic gasket increasing tightness level
Open Engineering, 2019
The paper presents new type of the semi-metallic gasket characterized with elastic core. Thanks to this solution more elastic recovery as well as more uniform contact stress distribution on the gasket’s surface were obtained which consequently caused that tightness level of the flange joint increased by 1000% in contrast to joint gasketed with traditional solution. The tightness characteristic of the traditional as well as new solution of the gaskets were determined experimentally and discussed.
2012
At the previous study of new metal gasket, contact width and contact stress were important design parameter for optimizing metal gasket performance. However, the range of contact stress had not been investigated thoroughly. In this study, we conducted a gasket design optimization based on an elastic and plastic contact stress analysis considering forming effect using FEM. The gasket model was simulated by using two simulation stages which is forming and tightening simulation. The optimum design based on an elastic and plastic contact stress was founded. Final evaluation was determined by helium leak quantity to check leakage performance of both type of gaskets. The helium leak test shows that a gasket based on the plastic contact stress design better than based on elastic stress design.
Review on Various Gaskets Based on the Materials, their Characteristics and Applications
Gaskets are extensively utilized in compound and petrochemical enterprises like refineries for most high-pressure framework applications such as channelling frameworks, joint associations, and ribs. Gaskets are also utilised in internal combustion engines, devices used in the medical field, electronics and instrumentation devices, electrical devices such as motors, transformers, generators, etc. Gaskets are traditionally used to give a seal between the mating countenances of the flanged joint, filling-in surface unpleasantness, unevenness and abnormalities in the mating confronts attributable to machining and assembling flaws or impediments. When all is said and done, the reason for gasket fixing is to lessen the outflow rate of media from the framework. In this paper, we have studied about the various classifications of the gasket, their properties and applications. The preliminary studies reveal that gaskets are mainly classified into a) metals b) non-metals c) polymers d) hybrid and each gasket can be utilized for some specific applications. Selection of the wrong gasket can lead to failure of the system and cause significant damage to the surfaces.
Development Of 25A-Size Three-Layer Metal Gasket By Using Fem Simulation
2016
Contact width and contact stress are important design parameters for optimizing corrugated metal gasket performance based on elastic and plastic contact stress. In this study, we used a three-layer metal gasket with Al, Cu, Ni as the outer layer, respectively. A finite element method was employed to develop simulation solution. The gasket model was simulated by using two simulation stages which are forming and tightening simulation. The simulation result shows that aluminum with tangent modulus, Eh<sub>al</sub> = E<sub>al</sub>/150 has the highest slope for contact width. The slope of contact width for plastic mode gasket was higher than the elastic mode gasket.
Analysis Of Contact Width And Contact Stress Of Three-Layer Corrugated Metal Gasket
2017
Contact width and contact stress are important parameters related to the leakage behavior of corrugated metal gasket. In this study, contact width and contact stress of three-layer corrugated metal gasket are investigated due to the modulus of elasticity and thickness of surface layer for 2 type gasket (0-MPa and 400-MPa mode). A finite element method was employed to develop simulation solution to analysis the effect of each parameter. The result indicated that lowering the modulus of elasticity ratio of surface layer will result in better contact width but the average contact stresses are smaller. When the modulus of elasticity ratio is held constant with thickness ratio increase, its contact width has an increscent trend otherwise the average contact stress has decreased trend.
Study of leakage in static gasket for cryogenic or high temperature conditions
The study of static seals for extreme applications is undergoing in a research group of seven laboratories supported by CNES, CNRS, EDF and SNECMA-Moteurs. The aim of the study is to predict the leakage rate for a given metallic gasket under closing load, fluid pressurisation and thermal conditions. Efforts are focused on the comprehension of physical phenomena driving the solid and fluid mechanics that govern the junction tightness, and in order to evaluate the impact of typical design parameters (surface roughness, geometric tolerances, materials, …).. Theoretical models, numerical analysis and experimentation are performed both in solid and fluid (gas and liquid phase flow) mechanics. A schematic flow chart of the study could be defined as follows: -Measurements of actual rough surface to obtain its topography.