Ultralight　sandwich　constructions　with　corrugated　channel　cores　(i.e.,　periodic　fluid-through　wavy　passages)　are　envisioned　to　possess　multifunctional　attributes:　simultaneous　load-carrying　and　heat　dissipation　via　active　cooling.　Titanium　alloy　(Ti-6Al-4V)　corrugated-channel-cored　sandwich　panels　(3CSPs)　with　thin　face　sheets　and　core　webs　were　fabricated　via　the　technique　of　selective　laser　melting　(SLM)　for　enhanced　shear　resistance　relative　to　other　fabrication　processes　such　as　vacuum　brazing.　Four-point　bending　responses　of　as-fabricated　3CSP　specimens,　including　bending　resistance　and　initial　collapse　modes,　were　experimentally　measured.　The　bending　characteristics　of　the　3CSP　structure　were　further　explored　using　a　combined　approach　of　analytical　modeling　and　numerical　simulation　based　on　the　method　of　finite　elements　(FE).　Both　the　analytical　and　numerical　predictions　were　validated　against　experimental　measurements.　Collapse　mechanism　maps　of　the　3CSP　structure　were　subsequently　constructed　using　the　analytical　model,　with　four　collapse　modes　considered　(face-sheet　yielding,　face-sheet　buckling,　core　yielding,　and　core　buckling),　which　were　used　to　evaluate　how　its　structural　geometry　affects　its　collapse　initiation　mode.　©　2021　by　the　authors.　Licensee　MDPI,　Basel,　Switzerland.