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Influence of mesoscopic foam structure on face sheet debonding in CFRP foam core sandwich panels

: Schlimper, R.; John, M.; Rinker, M.; Schäuble, R.

Quaresimin, M. ; University of Padova, Department of Management and Engineering -dtg-; European Society for Composite Materials -ESCM-:
15th European Conference on Composite Materials, ECCM 2012. Proceedings : June 24-28, 2012, Venice, Italy
Padua: University of Padova, 2012
ISBN: 978-88-88785-33-2
8 S.
European Conference on Composite Materials (ECCM) <15, 2012, Venice>
Fraunhofer IWM ()
sandwich structures; fracture mechanics; face sheet debonding; foam structure

The face sheet debonding of CFRP foam core sandwich structures under quasi-static loading is investigated by the Single Cantilever Beam test where the initial crack is loaded under global Mode I condition. The influence of the foam structure on the mesoscopic scale is studied by the use of several grades of Polymethacrylimid (PMI) foam cores varying in density and cell size. The morphological characterization of the foam structure is done by XRay computed tomography and 3d image analysis. The measured fracture toughness increases on increasing cell size of the foam core material and indicates enhanced damage tolerance concerning local debonding damages. Unfortunately the structural weight also increases on increasing cell size and related resin absorption of the foam core.