Tech Briefs

Automotive Gasket Simulation

In the automotive industry, gaskets are used to make the seals at various joints fluid-tight. In the example shown above, a typical gasket seals the joint between the cover and the base. The entire assembly is held together by two bolts.

In ADINA, the action of gaskets is simulated by material models. Here, we use the general gasket material model in a typical load cycle experienced by an automotive gasket. The gasket that we are modeling has a flat section and a bead section around its inner rim. The bead is 5% thicker than the rest of the gasket and possesses different material properties. The gasket is placed between two metallic components (the base and the cover) held together with the bolts. There is contact between the base and the gasket, the gasket and the cover, the cover and the bolt, and the bolt and the base.

As is typical in automotive gaskets, there is a proper procedure for tightening the bolts. In this example, the bolts are tightened by a third of the full load alternately until they are fully tightened. This leads to better (more symmetric) pressure distribution in the gasket.

In our simulation, an internal pressure is applied to the cover and bolt after the bolts were tightened. In this case, the pressure is high enough to make the gasket open fully (i.e., leak) as shown by the pressure band-plot.