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    Effect of carbon content and drawing strain on the fatigue behavior of tire cord filaments
    (Elsevier - Division Reed Elsevier India Pvt Ltd, 2018) Koymatcik, Huseyin; Ahlatci, Hayrettin; Sun, Yavuz; Turen, Yunus
    In this work we aim to investigate fatigue strengths of the steel filaments in diameter of 0.25 mm with three different Carbon (0.70%C, 0.80%C and 0.90%C) and with four different drawing strains (3.25, 3.37, 3.71 and 3.76) by the pure bending test method. All fatigue tests have been carried out at room temperature and at a frequency of 10 Hz via a custom manufactured pure bending testing machine of which the fully reserved strain value, R = epsilon(min)/epsilon(max), is -1. The applied value of cyclic deformation, epsilon, has been chosen from the range 0.20%-1.07% as bending strain. The plots of S-N (Strain-Cycle) curves are based on high cycle fatigue (HCF) life is greater than or equal to 10(4) cycles. The fatigue deformation limit values have been determined as 0.55% units and 0.20% units for the steels of the 0.25NT-70C and 0.25UT-90C quality, respectively. The increase in hardness resulting from the microstructural thinning (due to drawing strain) increases the fatigue deformation limit of the steels containing 0.80%C. Despite the increase in the drawing strain, carbon content and hardness, the fatigue deformation limit decreased with increasing inclusion content. Fractured surfaces of the samples, which have been broken at both high fatigue life and fatigue deformation limit values, are inspected via SEM. The SEM inspection has demonstrated that the fatigue fracturing of the steel filaments are similar to that of baseball bat cracking. (C) 2018 Karabuk University. Publishing services by Elsevier B.V.
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    Effect of drawing strain on fatigue behavior of steel tire cord filaments
    (Carl Hanser Verlag, 2018) Koymatcik, Huseyin; Ahlatci, Hayrettin
    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 = epsilon(min)/epsilon(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.
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    Pure Bending Fatigue Crack Propagation in Deep-Drawn Steel Cord Filaments
    (Springer, 2020) Koymatcik, Huseyin; Ahlatci, Hayrettin; Sun, Yavuz; Turen, Yunus
    Wires with diameter 0.25 mm from a carbon steel with 0.70 and 0.90% C for tire cords are studied. The effect of the treatment modes, of the carbon content and of the morphology of pearlite on the fatigue resistance of the wires under pure bending tests at a frequency of 10 Hz is determined. The fracture mechanism of the wires is considered. The influence of the microstructure and of the composition of the wires on the trajectory of fatigue cracks is determined with the help of scanning electron microscopy.