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Effects of ply sequence of adjacent plies on the determination of delamination fracture toughness in carbon/epoxy composites

Ashok Kumar Prodduturi, Ravinder Reddy Pinninti, Gupta AVSSKS

Abstract


The influence of ply sequence on the resistance to delamination fracture of composite laminates can be determined by Double Cantilever Beam (DCB) tests. However, to observe only the effect of delamination interface on the toughness value, both the global and local effects due to ply sequence should be uncoupled. The present work uses four DCB specimens prepared from carbon/epoxy fabric with different stacking sequences by maintaining same global elastic properties. The measured GIc values are higher than that of unidirectional laminates due to fiber bridging occurred between θ - oriented plies.
This paper presents an experimental study on the interlaminar fracture toughness in Mode I of each lay-up under quasi-static condition. Experimental results show that the measured Mode I interlaminar fracture toughness in terms of critical strain energy release rate, GIc at the crack initiation increases with both adjacent and sub-adjacent ply angles. The R-curve plateau values increases with the ply angle of adjacent plies

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References


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