02961nam 2200409 450 991079547630332120230803211624.03-8325-9534-1(CKB)4340000000244131(MiAaPQ)EBC523122058a1c68d-7ce0-4116-9cd7-3edeb0dd2d03(EXLCZ)99434000000024413120180523d2014 uy 0engurcnu||||||||txtrdacontentcrdamediacrrdacarrierAnalysis of the mechanical response of impact loaded composite sandwich structures with focus foam core shear failure /Tim Berend BlockBerlin :Logos Verlag Berlin,[2014]©20141 online resource (238 pages)Science-Report aus dem Faserinstitut BremenPublicationDate: 201412203-8325-3853-4 Long description: Sandwich structures are an economically and structurally efficient way of designing large integral composite parts. In the aerospace industry pre-impregnated face sheets and honeycomb core structures can be considered as industry standard while e.g. naval structures and wind turbine blades typically use vacuum infusion technology with polymer foam cores. Application of the less costly infusion technology in the aeronautical industry requires a thorough understanding of the damage tolerance including low velocity impact as a frequent source of damaging events. At low impact energies damage in composite foam core sandwich structures is limited to core crushing and local face sheet delaminations. Higher impact energies may initiate the competing failure modes face sheet rupture and core shear failure depending on impact, geometric and material parameters. Face sheet rupture leads to severe local damage with typically good visibility, while core shear failure leads to cracks and rear face sheet debonding of the foam core with less visibility. This work investigates the low velocity impact response of sandwich structures with carbon fiber reinforced plastic (CFRP) face sheets and a polymeric foam core using experiments at room temperature and at -55 Grad Celsius. An analytically derived failure mode map is presented as a simple tool for design guidelines while the explicit finite element method is applied for a more detailed description of the sandwich impact process. Both models are used to analyze the impact response and describe relevant sensitivity parameters of sandwich structures.MaterialsTestingMaterialsTesting.620.110287Block Tim Berend1540970MiAaPQMiAaPQMiAaPQBOOK9910795476303321Analysis of the mechanical response of impact loaded composite sandwich structures with focus foam core shear failure3792885UNINA