Sandwich panel simulation - bottle caps

Hello. I would like to do a static analysis on a sandwich panel made with different constituints: 2 10mm layers of PET with a core of 10mm of HDPE. The problem I'm having is that I wish to simulate the core with the shape of bottle caps, in order to study some new applications for this kind of waste. Is there a way to do it? Perhaps with an assembly of the constituents?

Thanks in advance.

SolidworksSimulation