Metal Foams: A Design Guide

114 Metal Foams: A Design Guide
b
t
c
t
2R
t
(b)
(a)
(c)
a
d
t
Figure 10.1 The geometry of sandwich structures: (a) a beam, (b) a circular
column, (c) a square column, (d) a circular panel and (e) a shell element
d c
d c
t
t
a
a
F/2
H
F/2 F/2
(a)
s
H
H
F/2 F/2
(b)
F
a
F/2
t
E f , s f y
E c , s c y
E f , s f y
E c , s c y
Figure 10.2 Sandwich beam under (a) four-point bending and
(b) three-point bending
a
loaded by flat-bottomed indenters of dimension a. The total load applied to
the beam is F in each case; for four-point bending the two inner indenters
arespacedadistances apart. Both the core and face-sheets are treated as
isotropic, elastic-plastic solids, with a Young’s modulus Ef for the face-sheet
and Ec for the core.
H
t
c
c
(d)
t
(e)
R