Mechanics of BCC and FCC hollow-sphere foams

Hollow-sphere foams provide an alternative microstructure for low-density metal structures with the potential for improved properties. In a recent companion paper, the mechanical properties of hollow-sphere foams with simple cubic packing (SC) were shown to be close to the theoretical values for closed-cell foams and well above the measured modulus and strength of metallic closed-cell foams. Here, we analyze the elastic moduli and initial yield strength of body-centered cubic and face-centered cubic (FCC) packings of hollow-sphere foams. In general, the FCC packing gives the highest values of moduli and strengths.