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A range of metallic lattice panels were manufactured using the selective laser melting (SLM) rapid prototyping technique.The Alporas foam and aluminium honeycomb were chosen as comparable core materials.The penetration behaviors of fully-supported and comer-supported sandwich panels were discussed.The penetration behaviour is of importance during foreign object impact and perforation of sandwich structures.A series of experimental tests have shown that the specific impactor penetration behaviours are similar for titanium alloy lattice cores and aluminium honeycomb cores.The deformation and rupture mechanisms of honeycomb and micro-lattice structures will be discussed in general terms, and these observations will be used to inform discussion of actual deformation and rupture in the panel tests.It is concluded that there is scope for improving the performance of micro-lattice structures to offer properties superior to that of aluminium foam and honeycomb.