The　integration　performance　of　rigid　and　flexible　materials　in　composite　structures　is　of　particular　interest　and　complexity.　In　this　work,　the　lattice　structure　of　the　steel　rod　mesh　cylinder　skeleton　was　used　to　fabricate　a　composite　structure　by　combining　it　with　polyurethane　(PU)　as　the　matrix.　The　objective　is　to　investigate　the　correlation　between　design　structure　and　mechanical　response　associated　with　the　combination　of　the　metallic　skeleton　and　polymer　materials.　Besides　the　energy　absorption　obtained　from　quasi-static　loading,　the　vibration　characteristics　via　a　sinusoidal　dynamic　excitation　test　were　analyzed　by　using　the　phonon　and　bandgap　theory.　The　experimental　results　show　that　the　addition　of　polyurethane　increases　the　vibration　suppression　performance　of　the　composite　structure.　The　band　diagram　and　the　compress　curves　show　that　the　energy　absorption　properties　of　the　metal/polymer　composited　lattice　structure　are　positively　related　to　the　rod　diameter,　whereas　the　influence　of　the　rod　diameter　on　the　vibration　suppression　properties　is　opposite.　The　increase　of　axial　angle　has　a　negative　influence　on　the　energy　absorption　properties　but　improves　the　vibration　suppression　properties.　©　2025　Institution　of　Structural　Engineers