Experimental Study on Delamination Migration in Composite Laminates

M F Pernice, Nelson V. De Carvalho, James G. Ratcliffe, Stephen R Hallett

Research output: Contribution to journalArticle (Academic Journal)peer-review

48 Citations (Scopus)
602 Downloads (Pure)

Abstract

The transition of delamination growth between different ply interfaces in composite tape laminates, known as migration, was investigated experimentally. The test method used promotes delamination growth initially along a 0/0 ply interface, which eventually migrates to a neighbouring 0/0 ply interface. Specimens with 0=60° and 75° were tested. Migration occurs in two main stages: (1) the initial 0/0 interface delamination turns, transforming into intraply cracks that grow through the 0 plies; this process occurs at multiple locations across the width of a specimen, (2) one or more of these cracks growing through the 0 plies reaches and turns into the 0/0 ply interface, where it continues to grow as a delamination. A correlation was established between these experimental observations and the shear stress sign at the delamination front, obtained by finite element analyses.

Overall, the experiments provide insight into the key mechanisms that govern delamination growth and migration.
Original languageEnglish
Pages (from-to)20-34
Number of pages15
JournalComposites Part A: Applied Science and Manufacturing
Volume73
Early online date27 Feb 2015
DOIs
Publication statusPublished - 2015

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