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Investigation of failure mechanisms in GFRP sandwich structures with face sheet wrinkle defects used for wind turbine blades

Investigation of failure mechanisms in GFRP sandwich structures with face sheet wrinkle defects used for wind turbine blades
Investigation of failure mechanisms in GFRP sandwich structures with face sheet wrinkle defects used for wind turbine blades
Wrinkle defects can be formed during the production of wind turbine blades consisting of composite monolithic and sandwich laminates. Earlier studies have shown that the in-plane compressive strength of a sandwich panel with wrinkle defects may decrease dramatically. This study focuses on the failure modes of sandwich specimens consisting of thick GFRP face sheets with a wrinkle defect and a balsa wood core subjected to in-plane compression loading. Three distinct modes of failure were found, and the strain distributions leading up to these failures were established by use of digital image correlation (DIC). Finite element analyses were subsequently conducted to model the response of the test specimens prior to failure, and generally a very good agreement was found with the DIC measurements, although slight differences between the predicted and measured strain fields were observed in the local strain values around the wrinkle defect. The Northwestern University (NU) failure criterion was applied to predict failure initiation, and a good correlation with the experimental observations was achieved.
GFRP sandwich structures, wrinkle defects, digital image correlation (DIC), finite element analysis (FEA), failure criteria
0263-8223
768-778
Leong, M.
3f7951cf-50cf-4201-9495-230583082dbe
Overgaard, L.C.T.
7a39e1eb-2afd-4f49-900b-8732c8013697
Thomsen, O.T.
f3e60b22-a09f-4d58-90da-d58e37d68047
Lund, E.
c663d217-9333-4b98-b59c-06c93cf4ba81
Daniel, I.M.
5583fd5e-dc04-4f50-966f-826fe18780fb
Leong, M.
3f7951cf-50cf-4201-9495-230583082dbe
Overgaard, L.C.T.
7a39e1eb-2afd-4f49-900b-8732c8013697
Thomsen, O.T.
f3e60b22-a09f-4d58-90da-d58e37d68047
Lund, E.
c663d217-9333-4b98-b59c-06c93cf4ba81
Daniel, I.M.
5583fd5e-dc04-4f50-966f-826fe18780fb

Leong, M., Overgaard, L.C.T., Thomsen, O.T., Lund, E. and Daniel, I.M. (2012) Investigation of failure mechanisms in GFRP sandwich structures with face sheet wrinkle defects used for wind turbine blades. Composite Structures, 94 (2), 768-778. (doi:10.1016/j.compstruct.2011.09.012).

Record type: Article

Abstract

Wrinkle defects can be formed during the production of wind turbine blades consisting of composite monolithic and sandwich laminates. Earlier studies have shown that the in-plane compressive strength of a sandwich panel with wrinkle defects may decrease dramatically. This study focuses on the failure modes of sandwich specimens consisting of thick GFRP face sheets with a wrinkle defect and a balsa wood core subjected to in-plane compression loading. Three distinct modes of failure were found, and the strain distributions leading up to these failures were established by use of digital image correlation (DIC). Finite element analyses were subsequently conducted to model the response of the test specimens prior to failure, and generally a very good agreement was found with the DIC measurements, although slight differences between the predicted and measured strain fields were observed in the local strain values around the wrinkle defect. The Northwestern University (NU) failure criterion was applied to predict failure initiation, and a good correlation with the experimental observations was achieved.

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More information

Published date: January 2012
Keywords: GFRP sandwich structures, wrinkle defects, digital image correlation (DIC), finite element analysis (FEA), failure criteria
Organisations: Faculty of Engineering and the Environment

Identifiers

Local EPrints ID: 339251
URI: http://eprints.soton.ac.uk/id/eprint/339251
ISSN: 0263-8223
PURE UUID: a23853ff-ee7f-4dfd-88f3-00748c3ac2aa

Catalogue record

Date deposited: 25 May 2012 10:01
Last modified: 16 Jul 2019 22:02

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Contributors

Author: M. Leong
Author: L.C.T. Overgaard
Author: O.T. Thomsen
Author: E. Lund
Author: I.M. Daniel

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