Effect of seawater on pin-loaded laminated composites

Ramazan Karakuzu; Halit Kanlıoğlu; Mehmet Emin Deniz

doi:10.3139/120.111121

Article

Effect of seawater on pin-loaded laminated composites

Ramazan Karakuzu , Halit Kanlıoğlu and Mehmet Emin Deniz

Published/Copyright: December 28, 2017

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From the journal Materials Testing Volume 60 Issue 1

Abstract

The aim of this study was to investigate the effect of seawater on bearing strength of glass-epoxy laminated composites. The ratio of the edge distance to pin diameter (E/D) was changed from 1 to 5 and that of the specimen width to pin diameter (W/D) was selected as 3 and 4 for this study. The hole of the specimen was subjected to a traction force induced by a pin. Laminated composite plates were manufactured at the Company Izoreel Composites. Tension tests were performed on pinned joint specimens with a stacking sequence of [0/90]_3S. The specimens were immersed in seawater of the Aegean Sea having a salinity of about 3.5 wt.-% in a glass aquarium at laboratory for 1, 3, 6, 9 and 12 months. For each period of immersion time, failure modes and maximum failure loads of the specimens were found experimentally. The maximum reduction of the bearing strength was obtained as 38% for E/D = 3 and W/D = 3 due to the seawater effect.

Kurzfassung

Das Ziel der diesem Beitrag zugrunde liegenden Studie bestand darin, die Auswirkungen von Meerwasser auf die Lagerfestigkeit von Glas-Epoxid-Laminat-Kompositen zu untersuchen. Das Verhältnis der Kantendistanz zum Stiftdurchmesser (E/D) wurde hierzu zwischen 1 und 5 variiert und ein Verhältnis zwischen Probenweite zum Stiftdurchmesser von 3 und 4 in der Studie gewählt. Das Loch in der Probe wurde einer Traktionskraft durch den Stift ausgesetzt. Für die Versuche wurden Laminat-Komposite von Izoreel Composites gefertigt. Es wurden Zugversuche mit den verstifteten Proben durchgeführt, die eine Stapelfolge von [0/90]_3S hatten. Im Labor wurden die Proben in Meerwasser der Ägäis mit einem Salzgehalt von 3,5% in einem Glasbehälter für 1, 3, 6, 9 bzw. 12 Monate getaucht. Für jede Immersionsdauer wurden die Versagensarten und die maximalen Versagenslasten experimentell ermittelt. Die maximale Reduktion der Lagerfestigkeit von 38% durch die Wirkung des Meerwassers wurde für E/D = 3 und W/D = 3 ermittelt.

*Correspondence Address, Prof. Dr. Ramazan Karakuzu, Department of Mechanical Engineering, Dokuz Eylul University, Tinaztepe Campus, 35397 Buca-Izmir, Turkey, E-Mail: ramazan.karakuzu@deu.edu.tr

Prof. Dr. Ramazan Karakuzu, born in 1964, received his BSc degree in 1986, his MSc degree in 1988 and PhD degree in 1992 in Mechanics from the Department of Mechanical Enigneering of the Graduate School of Natural and Applied Sciences, Dokuz Eylul University, Izmir, Turkey. He is currently Professor of Mechanics in the Department of Mechanical Engineering, Engineering Faculty of Dokuz Eylul University, Izmir, Turkey. Research areas are the impact and post impact behaviors of laminated composite plates and composite pressure vessels, failure analysis of pinned joint composite structures and elasto-plastic stress analysis of composite plates. He is a member of the Turkish Sciences Academy (TUSA) and Turkish Society of Mechanical Engineers (TSME) and founding member of the Association of Biomechanics, Biomaterial, Tissue Engineering Research and Development (2008).

Halit Kanlıoğlu, born in 1982, received his BSc degree from the Department of Mechanical Engineering in 2007, and in 2009, the MSc degree in Mechanical Engineering from Dokuz Eylul University, Izmir, Turkey.

Assist. Prof. Dr. Mehmet Emin Deniz, born in 1981, received his BSc degree in Mechanical Engineering in 2002 and MSc degree in Mechanics from Harran University, Şanlıurfa, Turkey in 2005. He finished his PhD degree in Mechanics at the Graduate School of Natural and Applied Sciences, Dokuz Eylul University, Izmir, Turkey. He is currently Assistant Professor of Mechanics in the Department of Mechanical Engineering, Engineering Faculty of Batman University, Batman, Turkey. He has published thirteen international journal articles and participated in one national and eight international conferences. In addition, he is a researcher of a scientific project supported by “The Scientific and Technological Research Council of Turkey (TÜBİTAK)”. Furthermore, he is a member of the Turkish Society of Mechanical Engineers (TSME).

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Published Online: 2017-12-28

Published in Print: 2018-01-04

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https://doi.org/10.3139/120.111121