### Honeycomb Plate Properties

Define the following terms as

t = total face sheet thickness (both sheets together)
d = total core depth
E = Young's modulus of face sheets
nu = Poissons ratio (Greek letter)
g = material density of face sheet material
gc = material density of core
I' = bending mom. of inertia/width of plate
K = membrane stiffness of plate (composite)
D = bending stiffness of plate (composite)
w = weight per unit area of plate (composite)

From classical plate theory, considering only the face sheets to carry in-plane stresses:

membrane stiffness of plate (Eq. 1)

bending stiffness of plate (Eq. 2)

(NOTE: Shear flexibility of the plate is not included.)

Where I' is the bending moment of inertia of the honeycomb plate per unit width:

For d >> t, I' simplifies to:

(Eq. 3)

The weight per unit area of the plate is

Thus, the stiffness to weight ratios (membrane and bending) are

Define nondimensional stiffness/weight ratios

membrane

bending

Instructions for creating a NASTRAN PSHELL card for honeycomb panels.

Jim Loughlin

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