SYMPOSIA PAPER Published: 01 January 1986

Improvement of Edge Delamination Strength of Composite Laminates Using Adhesive Layers


A thin but tough adhesive inner layer placed in laminates at the proper interface has been found to give improved delamination strength. Static tension tests of laminates with (±302/˙903/∓302)T and (±35/0/90)s layups of graphite/epoxy show that the added adhesive inner layer effectively suppresses delamination until final failure. The effects of adhesive layers on interlaminar stresses and strain-energy release rate have been studied analytically using a finite-element method. It was found that the introduction of adhesive layers reduced the interlaminar stresses. Although there was no significant change in total strain-energy release rate, there was a significant decrease in the G1 (tension mode) percentage of the total strain-energy release rate.

Author Information

Chan, WS
Bell Helicopter Textron Inc., Fort Worth, TX
Rogers, C
Bell Helicopter Textron Inc., Fort Worth, TX
Aker, S
Bell Helicopter Textron Inc., Fort Worth, TX
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Developed by Committee: D30
Pages: 266–285
DOI: 10.1520/STP35353S
ISBN-EB: 978-0-8031-4963-2
ISBN-13: 978-0-8031-0447-1