SYMPOSIA PAPER Published: 01 January 1986

Delamination of Composite Laminates Stimulated by Interlaminar Shear


Although interlaminar shear stresses become very large in composite laminates, in the literature there is no conclusive demonstration of the onset of delamination in composites due to interlaminar shear. The present work addresses the title problem by accurate stress analysis, application of an average stress failure criterion over a predominant stress component, and testing chosen laminates made of T300/1034-C graphite epoxy to the onset of delamination. The stress analysis has been used to define the laminate stacking sequence and the required loading direction to eliminate modes of failure other than that stimulated by interlaminar shear stress. The predicted strains at the onset of delamination are close to experimental values in some of the laminates, and the predicted interfaces of delamination are the same as experimentally observed delaminated interfaces. This work leads to an understanding of validity of average stress failure criterion and probable causes of difference between the predicted and experimental values.

Author Information

Soni, SR
AdTech Systems Research Inc., Fairborn, OH
Kim, RY
AdTech Systems Research Inc., Fairborn, OH
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Developed by Committee: D30
Pages: 286–307
DOI: 10.1520/STP35354S
ISBN-EB: 978-0-8031-4963-2
ISBN-13: 978-0-8031-0447-1