HELP ON BENDING SANDWICH

[LUIGI74]

I WORK ABOUT SANDWICH COMPOSITES WITH WOVEN SKIN AND TWO DIFFERENT CORES IN THE MIDDLE OF THE STRUCTURE.
______
SKIN |
______|
CORE1 |
______|
CORE2 |
______|
CORE1 |
______|
SKIN |
______|

I HAVE FOUND THE EQUATIONS ABOUT A SYSTEM WITH ONLY ONE CORE ON THE CENTER. I DON'T KNOW HOW I CAN APPLY THE EQUATIONS TO MY STRUCTURE. CAN ANYONE HELP ME?

 

[Qshake]

Have you checked out Witney's text: Structural Analysis of Laminated Anisotropic Plates?

 

thank you Qshake for the reply.
i don't have this book... but i have resolved the problem, i have found the equations.
I must consider for the stifness the contributes of all elements... but if the properties of the core are small i can negleible that.
one question!
for the stiffness i must consider the skin distance from the neutral axis or the "baricenter"?

for the stress i know that i must consider the distance from the neutral axis.