Mode I interlaminar fracture of carbon/epoxy multidirectional laminates

A.B. Pereira, A.B. de Marais

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    117 Citations (Scopus)

    Abstract

    This paper reports an experimental study on the mode I interlaminar fracture of carbon/epoxy multidirectional specimens with 0°/° delaminating interfaces. The suitability of the double cantilever beam (DCB) specimens was first evaluated in three-dimensional (3D) finite element (FE) analyses, which addressed possible elastic couplings associated problems. In the DCB tests, extensive fibre bridging occurred as a result of transverse cracking of -oriented plies. This complex damage morphology caused pronounced R-curves with artificially high final values of the critical strain energy release rate, GIc. In these circumstances, GIc values of initiation from the film generated starter crack were considered the only true interlaminar properties. Moreover, they were found to be fairly independent of the delaminating interface, a result that could be interpreted in additional FE analyses concerning the interlaminar stress field ahead of the crack tip
    Original languageEnglish
    Pages (from-to)2261-2270
    JournalComposites Science and Technology
    Volume64
    Issue number13-14
    DOIs
    Publication statusPublished - 2004

    Keywords

    • stress intensity factors
    • cantilever beam specimens
    • cross-ply composites
    • dcb
    • cracks
    • growth

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