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Experimental Characterization of the Properties of Double-Lap Needled and Hybrid Joints of Carbon/Epoxy Composites

1
Institute of Polymer Mechanics, University of Latvia, Aizkraukles Str. 23, Riga LV-1006, Latvia
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Research Laboratory of Innovative Building Structures, Vilnius Gediminas Technical University (VGTU), Sauletekio Av. 11, Vilnius LT-10223, Lithuania
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Author to whom correspondence should be addressed.
Academic Editor: Javier Narciso
Materials 2015, 8(11), 7578-7586; https://doi.org/10.3390/ma8115410
Received: 14 August 2015 / Revised: 12 October 2015 / Accepted: 21 October 2015 / Published: 11 November 2015
(This article belongs to the Section Advanced Composites)
The effect of through-thickness reinforcement by thin 1 mm steel needles (z-pins) on the static tensile strength of double-lap joints of a carbon/epoxy composite was investigated. Two types of joints—z-pinned and hybrid (including glued ones)—were considered. The joints were reinforced in the overlap region with 9, 25, or 36 z-pins. Comparing mechanical properties of the double-lap joints with the corresponding characteristics of their unpinned counterparts, the z-pins were found to be highly effective: the strength and stiffness of the pinned joints increased up to 300% and 280%, respectively. These improvements were due to a transition in the failure mechanism from debonding of the joint in the absence of z-pins to pullout or shear rupture of z-pins or to the tensile failure of laminate adherends, depending on the volume content of the pins. View Full-Text
Keywords: carbon/epoxy composite; mechanical properties; joints; z-pins; hybrid carbon/epoxy composite; mechanical properties; joints; z-pins; hybrid
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Arnautov, A.; Nasibullins, A.; Gribniak, V.; Blumbergs, I.; Hauka, M. Experimental Characterization of the Properties of Double-Lap Needled and Hybrid Joints of Carbon/Epoxy Composites. Materials 2015, 8, 7578-7586.

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