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Title: Mixed mode I + II interlaminar fracture of carbon/epoxy laminates
Author: Pereira, A.B.
Morais, A.B. de
Keywords: Polymer-matrix composites (PMCs)
Fracture toughness
Finite element analysis (FEA)
Issue Date: 2008
Publisher: Elsevier
Abstract: This paper reports a study of the mixed mode I + II fracture of carbon/epoxy unidirectional and multidirectional specimens with symmetric, quasi-symmetric and markedly asymmetric legs. A beam model was developed for predicting the compliance and total strain energy release rate, G. Its predictions agreed well with three-dimensional finite element models and with experimental data of double cantilever beam, end-notched flexure and mixed-mode bending tests. The mode mix was determined from a virtual crack closure technique limit value analysis, in order to overcome ambiguity for delaminations between differently oriented plies. Initiation Gc values versus mode II ratio GII/G plots had practically identical shapes, showing a linear Gc increase with GII/G >= 25 %. Multidirectional specimens with quasi-symmetric and markedly asymmetric legs had similar Gc values.
Peer review: yes
DOI: 10.1016/j.compositesa.2007.10.013
ISSN: 1359-835X
Appears in Collections:DEM - Artigos

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