# How to compute core stress in honeycomb structure?

Assume I have a honecomb(sandwich) panel under distributed normal load. Each edge of this panel is simply supported(pinned) as on the picture below:

The problem is how to find the core stresses σ-z (not on sides of the panel) as on the picture below:

Also it will be very useful if you present some equations that describe σ-z in an ordinary (not honeycomb) panel. I'll be very pleased if you recommend some literature.

If all the cell walls were thickness $$t$$, each individual cell would be surrounded by a wall of thickness $$t/2$$ (since each wall is the boundary of two cells), but in fact two parallel walls of each cell have thickness $$2t$$ not $$t$$ so the "average" wall thickness surrounding an individual cell is $$2t/3$$ not $$t/2$$.