
352 Engineering Materials Technology
Figure 16.10 Corrugated cardboard
than the paper alone. A similar type of material is produced with metals, a
metal honeycomb structure sandwiched between thin sheets of metal. Such a
structure has good stiffness and is very light. Aluminium is often used for both
the honeycomb and the sheets.
A similar laminated structure to the corrugated cardboard or the honey-
comb between two plates is that of a plastic foam sandwiched between two
skins or plates. With these forms of structure, the bending stiffness of
a
panel
depends on the value of the product of the modulus of elasticity and the second
moment of are ...