Determination of Mechanical Properties and Failure Pressure in Composite Cylinders

Semih Benli; Mustafa Özen; Onur Sayman; Mehmet Emin Deniz

doi:10.3139/120.110294

Article

Determination of Mechanical Properties and Failure Pressure in Composite Cylinders

Semih Benli , Mustafa Özen , Onur Sayman and Mehmet Emin Deniz

Published/Copyright: May 26, 2013

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From the journal Materials Testing Volume 54 Issue 1

Abstract

In this study, mechanical properties of cylindrical composite specimens were measured experimentally. Composite cylinders oriented at 0° C and 90° were manufactured by using the hand lay -up technique. The cylinders were loaded axially for measuring the axial tensile strength and compressive strengths. Some specimens were attached to a torsion machine for measuring shear strength and shear modulus. Thus, a close and true measuring was performed in the cylindrical specimens. A finite element solution was performed in closed ended composite cylinders under internal pressure and thermal loading. Thermal stresses occur at low and high temperatures with respect to the room temperature. For a true or close solution in composite cylinders, mechanical properties should be determined in cylindrical composite specimens.

Kurzfassung

Für die diesem Beitrag zugrunde liegende Studie wurden die mechanischen Eigenschaften von zylinderförmigen Proben eines Kompositwerkstoffes experimentell bestimmt. Zur Herstellung der 0° und 90° orientierten Zylinder wurde die so genannte Hand-Lay-up Technik angewendet. Die Zylinder wurden axial belastet, um die axiale Zug- und Druckfestigkeit zu bestimmen. Einige Proben wurden in eine Torsionsprüfmaschine eingespannt, um die Scherfestigkeit und den Schermodul zu messen. Somit wurde eine schlüssige und den wahren Gegebenheiten angepasste Messtechnik angewendet. Anschließend wurde eine Finite Elemente-Simulation unter thermischer und Druckbelastung mit Proben durchgeführt, deren Enden geschlossen waren. Dabei traten thermische Spannungen bei gegenüber Raumtemperatur vergleichsweise hohen und niedrigen Temperaturen auf. Es kann festgestellt werden, dass für eine schlüssige und wahrheitsgetreue Prüfung von Kompositwerkstoffen zylindrische Proben verwendet werden sollten.

Semih Benli, born 1981, is a Research Assistant at the Department of Mechanical Engineering Dokuz Eylul University in Bornova Izmir, Turkey. He received his PhD at The Graduate School of Natural and Applied Sciences from the same university in 2010. His main scientific interests include mechanics of composite materials, impact behavior of composites, and biomechanics. As co-author or author he has published 9 papers in refereed Journals.

Mustafa Özen, born 1977, is a Research Assistant at the Department of Mechanical Engineering, Dokuz Eylül University, Turkey. He received his MS at the Graduate School of Natural and Applied Sciences from the Harran University. His areas of interest are composite materials, finite element method, and biomechanics. As co-author or an author he has published 3 papers in refereed Journals.

Onur Sayman, born 1947, is a Professor at the Department of Mechanical Engineering Dokuz Eylul University in Bornova Izmir, Turkey. He received his PhD at the Graduate School of Natural and Applied Sciences from the Ege University. His main scientific interests include composite materials, mechanics of composite materials, impact behavior of composites, the finite element method and elasto-plastic analysis. As co-author or author he has published 109 papers in refereed Journals.

Mehmet Emin Deniz, born 1981, is a Research Assistant at the Department of Mechanical Engineering Dokuz Eylul University in Bornova Izmir, Turkey. He received his PhD at The Graduate School of Natural and Applied Sciences from the same university in 2011. His main scientific interests include mechanics of composite materials and impact behavior of composites. As co-author or author he has published 5 papers in referered Journals.

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Published Online: 2013-05-26

Published in Print: 2012-01-01

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https://doi.org/10.3139/120.110294