Numerical damping stabilizes the numerical integration scheme by damping out the unwanted high frequency modes. You should not need to change this value. You need Structural Damping. Structural damping refers to physical damping present in the system. For more information, see Damping in the Structural Analysis Guide. nThe contact pressure could make a sudden reduction if the deformation in the C changes from one node in contact at the tip to several nodes in contact on the side.n