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Materials 2015, 8(11), 7578-7586; doi:10.3390/ma8115410

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
2
Research Laboratory of Innovative Building Structures, Vilnius Gediminas Technical University (VGTU), Sauletekio Av. 11, Vilnius LT-10223, Lithuania
*
Author to whom correspondence should be addressed.
Academic Editor: Javier Narciso
Received: 14 August 2015 / Revised: 12 October 2015 / Accepted: 21 October 2015 / Published: 11 November 2015
(This article belongs to the Section Advanced Composites)
View Full-Text   |   Download PDF [5001 KB, uploaded 11 November 2015]   |  

Abstract

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
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

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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