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Interlaminar/interfiber failure of unidirectional glass fiber reinforced composites used for wind turbine blades

Leong, M., Overgaard, L.C.T., Daniel, I.M., Lund, E. and Thomsen, O.T. (2012) Interlaminar/interfiber failure of unidirectional glass fiber reinforced composites used for wind turbine blades Journal of Composite Materials, 47, (3), pp. 363-368. (doi:10.1177/0021998312440132).

Record type: Article


A unidirectional glass fiber/epoxy composite was characterized under multi-axial loading by testing off-axis specimens under uniaxial tension and compression at various angles relative to the fiber direction. Iosipescu shear tests were performed with both symmetric and asymmetric specimens. Tests were performed on both 1-2 and 1-3 material coordinate planes. Strain gauges and Digital Image Correlation were used to record the stress–strain responses. A new approach was used to define a ‘failure initiation strength’ by analyzing the recorded stress–strain curves. The experimentally determined failure stresses were compared with the predictions of the maximum stress, Tsai-Wu and Northwestern University failure criteria. It was found that using the approach of analyzing the stress–strain curve to define a point of material failure initiation, it was possible to obtain good correlation between the experimental data and predictions by both the Tsai-Wu and the NU failure criteria.

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Published date: 22 March 2012
Keywords: glass fiber reinforced composites, material characterization, off-axis testing, failure criteria
Organisations: Faculty of Engineering and the Environment


Local EPrints ID: 339260
ISSN: 0021-9983
PURE UUID: 5646b0c0-bee4-4db6-a8cd-20159fccee0c

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Date deposited: 25 May 2012 09:27
Last modified: 18 Jul 2017 05:53

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

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