The octet truss lattice is known to be stretch dominated and to offer superior
mechanical properties compared with foams of identical (low) density and solid
composition. In the lattices, size effects in effective modulus were observed; they were
of small magnitude, 30% in torsion and 10% in bending. The Cosserat characteristic
lengths in torsion (1 mm) and in bending (0.5 mm) are considerably smaller than the
cell size, 4.5 mm. The lattice is therefore considered to be weakly Cosserat elastic in
comparison with designed lattices for which size effects can exceed a factor of 30, and
also in comparison with foams for which size effects can exceed a factor of
8.
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