有限要素接触解析とPersson理論を用いた金属ガスケット締結部のシール性能評価法の提案

抄録

Unexpected leakage can occur at the fastening points of various industrial products. The proactive evaluation at the development stage is necessary to prevent leakage of gases and liquids during product use. Sealing can be evaluated by calculating contact surface pressure using the finite element method (FEM) and by calculating the amount of leakage with contact theory, considering micro geometry. In general, these methods do not consider effects of machining marks, although which influences to amount of leakage. Therefore, this study proposes a sealing evaluation method to consider the effects of machining marks by combining the FEM and Persson's contact theory. The influence of the contact surface shape is verified by elemental tests, and it is confirmed that not only the roughness but also the machining shape had a significant influence. The same roughness, however, the surface pressure direction intersects the machining shape, the leakage can be 10 times larger than non-intersects one. It is also found that the amount of leakage increases exponentially with roughness. This sealing evaluation method effectiveness confirms that the actual measurement of leakage.