Development of New Metallic Gasket and its Optimum Design for Leakage Performance (original) (raw)
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Previous studies of new metal gaskets have established that the contact width, contact stress, and simulation process are important design parameters for optimizing the metal gasket performance. Optimum designs are thus realized based on the elastic and plastic contact stress. However, the influence of the flange surface roughness has not been investigated thoroughly. In this study, we developed a gasket model that includes the flange surface roughness effect. A flange can have different surface roughness levels. A finite element method was employed to develop the simulation solution. The contact width, contact stress, and force per unit length for gasket in contact with a flange having different surface roughness levels were obtained through the simulation. The leakage performance improved with an increase in the contact width and contact stress. The slope of the force per unit length increased with a decrease in the surface roughness level. Furthermore, the slope of the force per unit length for a gasket in 400-MPa mode was higher than that for one in 0-MPa mode. The higher slope suggests that the gasket and flange are pressed together strongly. Finally, the helium leakage quantity was determined to evaluate the leakage performance. The experimental result shows that the gasket in 400-MPa mode shows better sealing performance than the gasket in 0-MPa mode. For a low axial force, changes in the surface roughness caused significant changes in the leakage; the same was not observed for a high axial force.
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Since Asbestos has been banned, the research and development of new gasket materials and designs have continued. One of the materials that are closest to the nature of asbestos is metal. Metal gaskets have been used extensively as static insulation in many industries because they have high temperature and chemical resistance, can withstand pressure, be recycled, and reliability in critical situations. Types of metal gaskets can be distinguished based on their shape. The focus of this research is the corrugated type gasket. Based on previous research, it has been found that important parameters of metal gasket performance are contact width and contact stress. Research developed so far is that the design of corrugated metal gaskets is divided into two types based only on the contact width of the plastic conditions without considering the magnitude of the contact stress and vice versa. In this study, we propose a new approach with contact width and contact stress calculated together as evaluation criteria to optimize corrugated metal gaskets' design. The Taguchi method is used as an optimization design method and a finite element software to obtain result data. This study aimed to obtain an optimal gasket design by utilizing this new approach by using the Taguchi method as an experimental design and simulation method to obtain the result data. This will result in a new design of corrugated metal gasket type which can prevent better leakage performance.