Bending and lateral crushing behavior of a GFRP and PA6 reinforced aluminum square tube

Seçil Ekşi; Kenan Genel; Akın Oğuz Kaptı; Kenan Acar

doi:10.3139/120.111194

Article

Bending and lateral crushing behavior of a GFRP and PA6 reinforced aluminum square tube

Seçil Ekşi , Kenan Genel , Akın Oğuz Kaptı and Kenan Acar

Published/Copyright: November 15, 2018

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From the journal Materials Testing Volume 60 Issue 6

Abstract

In this study, the bending behavior of a thin-walled aluminum square tube (AST) were analyzed using the finite element (FE) method, and reinforcing arrangements were decided for the composite beams based on the FE results. Accordingly, bending behavior of thin-walled ASTs with internal cast polyamide (PA6) and external glass fiber reinforcement polymers (GFRP) were investigated via a quasi static three-point bending test experimentally. Moreover, bending performance under impact loading was also investigated experimentally. The results revealed that local buckling has a decisive influence on bending performance of the tube, and the contribution of inner reinforcement is more effective than outer reinforcement. The reinforcements provide 575 % and 312 % increases in bending load and impact energy, respectively. The developed plastic-metal hybrid-composite structure is promising especially for critical supporting parts in vehicles. It is thought that the combination of these materials will offer new focus of attention for designers seeking more appropriate composite beams with high bending load and impact resistance.

Kurzfassung

Für den vorliegenden Beitrag wurde das Biegeverhalten eines dünnwandigem quadratischen Aluminiumrohres (aluminum square tube (AST)) mittels der Finite-Elemente-Methode (FEM) analysiert, und es wurden Verstärkungsmaßnahmen für die Kompositträger basierend auf den Ergebnissen der FEM-Berechnungen berücksichtigt. Entsprechend wurde das Biegeverhalten der dünnwandigen ASTs mit internem Gußpolyamid (PA6) und externen glasfaserverstärkten Polymeren (GFRP) mittels des quasi-statischen Dreipunkt-Biegeversuches experimentell untersucht. Darüber hinaus wurde das Biegeverhalten unter Impakt-Beanspruchung ebenfalls experimentell untersucht. Die Ergebnisse zeigen, dass die lokale Beulung einen entscheidenden Einfluss auf das Biegeverhalten des Rohres hat und dass der Beitrag der inneren Verstärkung effektiver als die alleinige äußere Verstärkung ist. Die Verstärkungen ergeben eine entsprechende Zunahme von 575 % und 312 % in der Biegebeanspruchungsbarkeit und in der Schlagenergie. Die entwickelte Kunststoff-Metall-Kompositstruktur erscheint vielversprechend, insbesondere für kritische Teile, die als Unterstützungsglieder in Fahrzeugen dienen. Es wird angenommen, dass die Kombination dieser Materialien einen neuen Schwerpunkt des Interesses von Designern hervorruft, die besser geeignete Kompositträger mit einer hohen Biegebelastbarkeit und Impaktresistenz suchen.

*Correspondence Address, Assistant Professor Seçil Ekşi, Mechanical Engineering Department, Esentepe Campus, Sakarya University, 54187, Sakarya, Turkey, E-mail: eksi@sakarya.edu.tr

Assistant Prof. Dr. Seçil Ekşi works in the Department of Mechanical Engineering at Engineering Faculty, Sakarya University, Sakarya, Turkey. She received a BS degree and MS degree in Mechanical Engineering from Sakarya University, Sakarya, Turkey, in 2004 and 2006, respectively, and a PhD degree in Mechanical Engineering also from Sakarya University, in 2014. Her research interests include materials, composites, mechanical behavior of material, manufacturing, finite element method.

Prof. Dr. Kenan Genel is a Professor in the Department of Mechanical Engineering at Engineering Faculty, Sakarya University, Sakarya, Turkey. He received a BS degree and MS degree in Mechanical Engineering from İstanbul Technical University, İstanbul, Turkey, in 1990 and 1993, respectively, and a PhD degree in Mechanical Engineering also from Istanbul Technical University in 2000. His research interests include materials, mechanical behavior of material, material selection, surface coating and fatigue.

Associate Prof. Dr. Akın Oğuz Kaptı works in the Department of Mechanical Engineering at Engineering Faculty, Sakarya University, Sakarya, Turkey. He received a BS degree and MS degree in Mechanical Engineering from Yıldız Technical University, İstanbul, Turkey, in 1986 and 1989, respectively, and a PhD degree in Mechanical Engineering from Istanbul Technical University, Istanbul, in 2001. His research interests include biomechanics, mechanics, prosthesis and orthotics design, plastic injection mold, composites.

Kenan Acar, is a PhD student in the Department of Mechanical Engineering at Engineering Faculty, Sakarya University, Sakarya, Turkey. He received a BS degree in Mechanical Engineering from İstanbul University, İstanbul, Turkey, in 2008. He received a MS degree in Mechanical Engineering from Sakarya University in 2011. His research interests include materials, composites, computer aided design, Hydraulic and pneumatics.

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Published Online: 2018-11-15

Published in Print: 2018-06-30

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https://doi.org/10.3139/120.111194