Debonding　at　the　wire/matrix　interface　is　a　critical　failure　mode　for　spiral　skeleton-polyurethane　composites.　In　this　work,　the　interfacial　damage　characteristics　were　determined　using　a　finite　element　model　based　on　the　cohesive　contact　approach.　The　cohesive　surface　quadratic　stress　criterion　(CSQUADSCRT)　and　cohesive　surface　damage　(CSDMG)　were　used　to　characterize　the　damage　state　of　the　interface.　The　results　indicate　that　the　stress　shifts　along　the　loaded　direction　during　interface　damage.　As　the　matrix　thickness　and　embedded　depth　increased,　the　pull-out　load　increased,　whereas　the　failure　displacement　decreased.　Using　the　base　contact　mode　results　in　a　significantly　smaller　damage　displacement　compared　to　the　case　without　base　contact.　When　the　strain　of　the　spiral　wire　composite　is　0.4,　no　damage　occurs　at　the　composite　interface.　The　stress　and　interface　secondary　tension　damage　factor　of　the　spiral　wire　surface　fluctuate,　with　damage　at　the　loaded　end　face　being　significantly　higher　than　at　the　vertically　loaded　end　face.　©　2024　Elsevier　Ltd