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Ply drop-off effects in CFRP/honeycomb sandwich panels: experimental results

par Thomsen, Ole Thybo;Rits, Willy;Eaton, David;Dupont, Olivier ;Queeckers, Patrick
Référence Composites science and technology, 56, 4, page (423-437)
Publication Publié, 1996

Article révisé par les pairs

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Résumé :

The results of a combined experimental and theoretical investigation of local bending effects induced by ply drop-off in CFRP/honeycomb sandwich panels are presented. The objective of the investigation was to validate a simple model for engineering analysis of sandwich panels with tapered face laminates presented in a previous paper. The experimental investigation was conducted by using electronic speckle pattern interferometry (ESPI), which provides very accurate out-of-plane surface displacement measurements. Six CFRP/honeycomb sandwich test specimens of three different configurations were manufactured, each configuration being characterised by different elastic response properties. The CFRP/honeycomb sandwich test specimens were loaded in compression, and comparison of the theoretically predicted and measured out-of-plane deflection profiles revealed a good match with respect to the local bending response induced by the ply drop-offs. However, the experiments also revealed the presence of a significant local bending response caused by the discrete support of the face laminates provided by the honeycomb core cells. © 1996 Elsevier Science Limited.