hi all,

The question is about my sandwich beam "two steel and a viscoelastic material with 50ib mass at the tip".

When I made many run with different rubber thickness, I saw two different cases



1-The H"rubber"=<H"steel"



2-The H"rubber"=>H"steel"



Why the decrease in rubber thickness in Case 1 is increases the damping and in Case 2 decreases the damping. The decrease in rubber thickness should always give me increase in damping.
Any help is appreciate it.