Sandwich beams with high porosity and specific strength Al alloy foam core
高比强高孔隙率泡沫铝合金三明治梁

The compression and shear capacities of Al alloy foam and Al foam were studied. The failure modes and peak loads of sandwich beams with this Al alloy foam core were measured which was in good agreement with theoretic values. A design method is given which shows that rigidity is used as design controlling index for a low given load while relative peak load is used as controlling index for a high load. Comparison is made between the sandwich beams with the two different cores. It is concluded that sandwiches with Al alloy foam core have a rigidity 0$\sim$0.185 times higher than sandwiches with Al foam core, and a peak load 0.57$\sim$1.8 times higher under core--shear mode and 0.9$\sim$2.2 times higher under indentation than sandwiches with Al foam core.