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Determining Springback Behavior of High-Strength Steels via Channel Forming Process

100%
Esener E., Sönmez E., Özsoy M., Firat M.
Acta Physica Polonica A
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2017
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vol. 132
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issue 3
1010-1012
EN
The increasing use of high-strength steels in sheet metal automotive parts usually brings about the springback problems that can not be easily solved, compared to stamping the parts of conventional steel grades. Prediction and compensation of springback at the design stage is very important from both, the academic and the industrial perspectives. For this purpose, finite element analysis and simulative tests are used to understand formability properties of the material. In this study, springback behaviour of high-strength steels was investigated. Angular channel forming process is used as a simulative test with the DP600, DP1000, and DP1400 materials. Channel forming die tools were designed using a shallowly curved geometry for investigating springback behaviour of materials. Die tools were manufactured and forming process was performed at a hydraulic press machine. Sample surfaces were scanned using optical scanning. Then, experimental springback surfaces were compared with reference geometry by shape deviation analysis. It is observed that springback amount of DP1400 is much greater than those of DP600 and DP800 steels. The DP600 steel has minimum springback amount in the flange region and it has shown the smallest deviation from the reference forming surface, as a result of shape deviation analysis.
2
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Tribological Behaviors of SiO_2 Added Polyester Matrix Thermosetting Composites

100%
Akinci A., Ozsoy M., Firat M., Sen U.
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vol. 125
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issue 2
560-562
EN
In this study, the tribological behavior of polyester matrix composites filled with silicon dioxide (SiO_2) particles is investigated. The tribological characteristics of pure polyester and 10, 20, 30 and 40 wt% SiO_2 filled polyester composites were comparatively evaluated under dry sliding conditions. Wear tests were carried out at room temperature under the loads of 10, 20, and 30 N at the sliding speed of 1 m/s. The wear test results showed that the SiO_2 particles could improve the wear resistance. The friction coefficient of the polyester was getting increased from 0.228 to 1.1052 with an increase in SiO_2 content depending on applied loads. The results showed that the wear rates of pure polyester and SiO_2 filled polyester composites increased with increase in loads. The wear rates of the SiO_2 filled polyester composites were significantly affected from the SiO_2 content. The wear rate of the polyester changed from 8.0 × 10^{-7} mm^3/m to 1.72 × 10^{-5} mm^3/m depending on SiO_2 contents and applied loads.
3
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Determination of the Fatigue Behavior of a Wheel Rim Using Finite Element Analysis

100%
Esener E., Ercan S., Firat M.
Acta Physica Polonica A
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2017
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vol. 132
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issue 3
617-619
EN
Automobile wheel rims are critical elements that work under fatigue loading. For this reason, it is very important to determine fatigue damage of the wheel rims. Today, finite element analysis is used to make accurate predictions. In this study, it is aimed to determine Chaboche damage model parameters for an aluminium alloy wheel rim. Msc Marc software is used for finite element analysis. First, Chaboche damage model parameters are obtained using simple Holloman equation for finite element analysis. Model parameters are validated by single element tests. Then, fatigue behaviour of an automobile wheel rim is analysed with verified Chaboche parameters. At last, critical areas under fatigue loading are identified on the wheel rim.
4
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Structural Strength and Fatigue Life Calculation of Y32 Bogie Frame by Finite Element Method

88%
Ozsoy M., Pehlivan K., Firat M., Ozsoy N., Ucar V.
Acta Physica Polonica A
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2015
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vol. 128
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issue 2B
B-327-B-329
EN
In this study structural strength and fatigue life estimation of Y32 bogie frame were examined by finite element method. A static structural and fatigue life simulation were performed according to TS EN 13749 standard. The results of the static structural and fatigue life simulations depicted that Y32 bogie manufactured by Tuvasas achieved the regulations.
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