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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 828Fatigue Properties of Aerospace Z-Pinned...

Fatigue Properties of Aerospace Z-Pinned Composites

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Abstract:

This paper presents an experimental study into the effect of through-thickness z-pin reinforcement on the in-plane and out-of-plane (delamination) fatigue properties of carbon-epoxy composites used in aerospace structures. The in-plane fatigue strength and fatigue life (load cycles-to-failure) of aerospace composite materials are reduced by z-pins. The in-plane compressive fatigue properties decrease when the volume content of z-pins is increased. Reductions to the in-plane fatigue properties are due to microstructural damage caused by the z-pins. However, the out-of-plane (delamination) fatigue properties of composites are increased greatly by z-pins. The mode I, mode II and mixed mode I/II delamination fatigue properties increase rapidly with increasing volume content of z-pins. The improvement is due to the z-pins forming a large-scale bridging zone along the delamination which resists fatigue crack growth. The work clearly reveals that a trade-off exists between the in-plane and out-of-plane fatigue properties of z-pinned composites. Improvements to the delamination fatigue properties come at the expense of lower in-plane fatigue performance, and this is a key consideration for the design of z-pinned aerospace composite structures.

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Periodical:

Applied Mechanics and Materials (Volume 828)

Pages:

67-75

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.828.67

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Online since:

March 2016

Authors:

Adrian P. Mouritz*, Fabio Pegorin, Mohd Dali Isa, Khomkrit Pingkarawat

Keywords:

Composite, Delamination, Fatigue, Strength, Z-Pins

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© 2016 Trans Tech Publications Ltd. All Rights Reserved

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* - Corresponding Author

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