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Investigation of skin-core debonding in sandwich structures with foam cores

Bragagnolo, G., Crocombe, A. D., Ogin, S. L., Mohagheghian, I., Sordon, A., Meeks, G. and Santoni, C. (2019) Investigation of skin-core debonding in sandwich structures with foam cores Materials & Design.

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Debonding between the skins and the core in a sandwich structure is a critical failure mode in automotive applications; once debonding occurs, the load carrying capacity of a sandwich structure drastically decreases. In the present paper, the effect of using three core materials, with different cell characteristics, on the interfacial strength between the foam cores and a CFRP skin is investigated through mechanical testing and numerical modelling. A key finding is that foams with a coarse cellular structure favour a high resin uptake at the interface during the manufacturing process, which results in a stronger interfacial bonding between the foam and the CFRP. During Mode I loading, the thick resin layer at the interface postpones crack initiation and kinking in the core, whilst under Mode II, this resin layer delays the collapse in compression of foam cells under the crack tip. Thus, the importance of including this thick resin layer in the FE modelling was demonstrated. Finally, as the CZM was shown to be unable to predict the unstable crack propagation within the core, an alternative approach was suggested which has the significant benefit of not requiring experimental testing of the interface between the skin and the core.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
Crocombe, A.
Ogin, S.
Sordon, A.
Meeks, G.
Santoni, C.
Date : 25 October 2019
Funders : EPSRC - Engineering and Physical Sciences Research Council, McLaren Automotive Ltd
Uncontrolled Keywords : Debonding; Interface; FEA; Sandwich structures; Foam core
Depositing User : Diane Maxfield
Date Deposited : 12 Nov 2019 11:08
Last Modified : 12 Nov 2019 11:08

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