Effect of drawing strain on fatigue behavior of steel tire cord filaments

Huseyin Koymatcik; Hayrettin Ahlatci

doi:10.3139/120.111267

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Effect of drawing strain on fatigue behavior of steel tire cord filaments

Huseyin Koymatcik und Hayrettin Ahlatci

Veröffentlicht/Copyright: 18. Januar 2019

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Abstract

The experimental and numerically predicted fatigue strength of steel tire cord filaments used as reinforcing elements in automobile tires has been determined in this study by means of the pure bending test. The filaments had diameters of 0.20 and 0.25 mm and were produced under three distinct conditions of cold drawing strain quantified as 3.37, 3.68, and 3.71 %. All the fatigue tests were conducted at room temperature and at a frequency of 10 Hz via a custom manufactured pure bending tester with a fully reversible alternating strain value, R = ∊_min/∊_max, is −1. As the drawing strain value increased, the fatigue deformation limit increased parallel to an improvement in the mechanical properties. One can expect that an increase in drawing strain through a decrease in filament diameter will provide an improvement in the light weight design of cars.

Kurzfassung

Für die diesem Beitrag zugrunde liegende Studie wurden experimentell und numerisch vorhergesagte Ermüdungsfestigkeiten von Filamenten für Stahlgürtelreifen, die als Verstärkungselemente in Automobilreifen verwandt werden, mittels des reinen Biegetestverfahrens bestimmt. Die Filamente hatten einen Durchmesser von 0,2 und 0,25 mm und wurden unter drei verschiedenen Dehnungen, 3,37, 3.68 und 3,71 %, beim Kaltziehen hergestellt. Alle Ermüdungsversuche wurden bei Raumtemperatur bei einer Frequenz von 1 Hz mittels einer vom Kunden hergestellten reinen Biegeprüfmaschine mit einem voll-reversiblen Wechseldehnungswert von R = ∊_min/∊_max = −1 ausgeführt. Mit Zunahme des Wertes der Kaltziehdehnung nahm das Ermüdungsverformungslimit parallel mit einer Verbesserung der mechanischen Eigenschaften zu. Es lässt sich ableiten, dass eine Erhöhung der Dehnung beim Ziehen durch Herabsetzen des Filamentdurchmessers eine Verbesserung in Richtung des Leichtbaus bei Automobilen mit sich bringt.

*Correspondence Address, Prof. Dr. Hayrettin Ahlatci, Department of Metallurgical, and Material Science Engineering, Karabuk University, Karabuk, Turkey, E-mail: hahlatci@karabuk.edu.tr

Huseyin Koymatcik, born in 1985, is a PhD student at the Department of Metallurgical and Materials Engineering, Karabuk University, Karabuk, Turkey. He received his Master's degree in Heat Treatment Rail from that university in 2012. His field of research is the fatigue of steel cord.

Prof. Dr. Hayrettin Ahlatci, born 1969, obtained his Bachelor's degree from the Department of Metallurgical and Material Engineering, Istanbul Technical University (ITU), Turkey, in 1994. He completed his MSc and PhD degrees at the Institute of Science at ITU. Presently, he is Professor and Head of the Department of Metallurgical and Materials Engineering, Faculty of Engineering, Karabuk University, Turkey.

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Published Online: 2019-01-18

Published in Print: 2018-12-04

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https://doi.org/10.3139/120.111267