How　sand　filling　affects　the　dynamic　response　of　metallic　corrugated　sandwich　beams　under　shock　loading　was　characterized,　both　experimentally　and　numerically,　with　shock　loading　simulated　by　high-speed　impact　of　aluminum　foam　projectiles　at　beam　mid-span.　To　facilitate　evaluating　the　effects　of　sand　filling,　both　empty　and　sand-filled　corrugated　core　sandwich　beams　were　assessed　and　compared　for　shock　resistance.　Representative　deformation　processes,　deformation　and　failure　modes,　and　beam　deflections　were　experimentally　obtained　and　analyzed.　Sand-filled　sandwich　beams　exhibited　much　higher　shock　resistance　than　the　empty　ones.　Numerical　simulations　were　subsequently　conducted　using　a　coupled　discrete　particle/finite　element　approach　that　takes　into　account　the　coupling　interaction　between　the　sand　grains　and　corrugation　members.　The　simulations　predicted　reasonably　well　the　primary　features　(permanent　mid-span　deflections　and　deformation　modes)　of　both　the　empty　and　sand-filled　sandwich　beams　observed　experimentally.　The　validated　numerical　model　was　employed　to　evaluate　how　the　properties　of　the　filling　sand　and　other　granular　filling　materials,　e.g.,　density,　stiffness,　friction　and　damping,　affect　the　shock　resistance　of　sandwich　beams.　The　results　indicated　that　the　shock　resistance　was　sensitive　to,　firstly,　the　density　and　stiffness　of　sand　and,　secondly,　the　friction　between　sand　particles.　In　contrast,　the　damping　between　sand　particles　had　little　effect.　©　2020　Elsevier　Ltd