Previous studies on corrugated metal gaskets have established that the contact width, contact stress, and surface roughness are important design parameters for optimizing gasket performance. However, the contact stress and contact width considering the surface roughness when the leakage occur did not defined yet. In this study, we determined the real contact stress and contact width when leakage started on 25A-size metal gasket. The contact width determined through a comparison between simulation and experimental results. The contact stress determined through a simulation analysis. The experiment involves a helium leakage test using new metal gaskets having different surface roughness levels. The result justified that the real contact width and average contact stress when the leakage started occur were 0.195mm and 800MPa, respectively. There is a good agreement for contact width both by simulation and experiment result. The contact width for flange having surface roughness 1.5μm is longest than the others.
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.
Performance of metal gasket influenced by the final design of the forming result. Good shape of the gasket will give optimal leakage performance. It is difficult to produce good shape because of the spring back effect. In this study, we investigated the forming process of metal gasket 400MPa-mode for two types of dies which are open dies and closed dies. The finite element method employed to analyze the effect of different types of dies on the final design of the corrugated metal gasket. The simulation shows corrugated metal gasket 400MPa-mode with closed dies result in better final shape than open dies.
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