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Delamination R-curve as a material property of unidirectional glass/epoxy composites
Highlights ► The R-curve behavior of a unidirectional laminate as a material property is investigated. ► Effect of initial crack length and thickness on R-curve is experimentally shown. ► A mathematical relation is proposed to model the R-curve behavior of any unidirectional laminated composite.
Abstract It is still questionable to think of delamination resistance of a double cantilever beam (DCB) as a material property independent of the specimen size and geometry. In this research, the effects of initial crack length and DCB specimen thickness on the mode I delamination resistance curve (R-curve) behavior of different unidirectional glass/epoxy DCB specimens are experimentally investigated. It is observed that the magnitudes of initiation and propagation delamination toughness (G Ic-init and G Ic-prop) as well as the fiber bridging length are constant in a specific range of the initial crack length to the DCB specimen thickness ratios of 8.5< a 0/h <19. Finally, a mathematical relationship is proposed for prediction of mode I delamination behavior (from the initiation to propagation) of E-glass/epoxy DCB specimens.
Delamination R-curve as a material property of unidirectional glass/epoxy composites
Highlights ► The R-curve behavior of a unidirectional laminate as a material property is investigated. ► Effect of initial crack length and thickness on R-curve is experimentally shown. ► A mathematical relation is proposed to model the R-curve behavior of any unidirectional laminated composite.
Abstract It is still questionable to think of delamination resistance of a double cantilever beam (DCB) as a material property independent of the specimen size and geometry. In this research, the effects of initial crack length and DCB specimen thickness on the mode I delamination resistance curve (R-curve) behavior of different unidirectional glass/epoxy DCB specimens are experimentally investigated. It is observed that the magnitudes of initiation and propagation delamination toughness (G Ic-init and G Ic-prop) as well as the fiber bridging length are constant in a specific range of the initial crack length to the DCB specimen thickness ratios of 8.5< a 0/h <19. Finally, a mathematical relationship is proposed for prediction of mode I delamination behavior (from the initiation to propagation) of E-glass/epoxy DCB specimens.
Delamination R-curve as a material property of unidirectional glass/epoxy composites
Shokrieh, M.M. (author) / Heidari-Rarani, M. (author) / Ayatollahi, M.R. (author)
2011-08-02
8 pages
Article (Journal)
Electronic Resource
English
Delamination R-curve as a material property of unidirectional glass/epoxy composites
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