This paper investigates the low velocity response of sandwich panels with four different lattice cores by conducting drop-weight impact tests.Sandwich panels are made of galvanized sheet and 3D-printed lattice cores in this study.Four different types of lattice,including body-centered cubic(BCC),z-reinforced body-centered-cubic(BCCz),gyroid lattice and Schwarz P lattice,are selected for the cores of sandwich panels respectively.Functional graded versions of these lattices are also examined,which features a density gradient along impact direction.Low-velocity impact response of a solid sandwich panel with the same quality is tested as a comparison.Experimental results show that lattice sandwich panels absorb more energy compared with solid sandwich panels.In addition,the graded lattice cores can further improve the energy absorption capacity of sandwich panels.
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