The compressive and shear responses of corrugated and diamond lattice materials

Corrugated and diamond lattice materials have been manufactured as the cores of sandwich panels by slotting together stainless steel sheets and then brazing together the assembly. The out-of-plane compressive, transverse shear and longitudinal shear responses of the corrugated cores have been measured at three relative densities 0.03<ρ¯⩽0.10 and compared with analytical and finite element (FE) predictions. Finite element models are in good agreement with the experimental measurements while the analytical models over-predict the measured strength due to a neglect of manufacturing imperfections. The out-of-plane compressive and transverse shear responses of the diamond cores have also been measured at three relative densities 0.08⩽ρ¯⩽0.25. The compressive strengths are sensitive to the aspect ratio of the specimens for L/H < 4 and again are below the analytical predictions due to imperfections. The longitudinal shear strength and energy absorption compare favorably with competing core topologies but the prismatic corrugated and diamond cores are weaker than the pyramidal and square-honeycomb under compression and transverse shear.