MEHMET EMİN DEMİR

Dr. MEHMET EMİN DEMİR

orcid

Research Focus & Metrics

Academic Career Length

8Years (2019-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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7 November 2022 in Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering
Verified
Journal Article
Closed access
EÇEdip Çetkin
Edip Çetkin
MDMEHMET EMİN DEMİR
MEHMET EMİN DEMİR
RERaşit Koray Ergün
Raşit Koray Ergün
In this study, adhesive wear of woven E-Glass fabric reinforced composites filled with aramid, B 4 C and mica particles at 0.5% wt. and 1.5% wt. ratios were carried out under dry sliding conditions. The effects of filler type, applied loads (5, 10 and 15 N) and sliding distances (250, 500 and 750 m) on the tribological behavior of the composites were investigated on the pin-on-disc device. As a result of the studies, it was determined that the friction coefficient in aramid reinforced composites was lower than the other reinforced composites. In wear volume due to wear, it was observed that the aramid wear volume was less. In addition, Wear volume increased with increasing load for all particle reinforcements. But, the highest wear volume occurred in the neat wear sample at 15 N load conditions. For the wear rate and wear volume, the fillers have shown improvement up to 1.5% wt. in the composite. 1.5% wt. aramid-filled glass fiber woven composites showed the lowest wear rate: 2.82 × 10 −4 mm 3 /N-m (at 15 N normal load). In addition, in the scanning electron microscope images taken, it was observed that there were breaks in the size of 15.07 µm in the epoxy and 61.11 µm in the fibers. The use of aramid with particle reinforcement rather than fiber is important for wear. In addition, the lowest wear volume was 65% more resistant at 1.5% wt aramid reinforcement and at 15 N load compared to the unreinforced composite in the abrasion tests.

13 November 2022 in Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering
Verified
Journal Article
Closed access
MDMEHMET EMİN DEMİR
MEHMET EMİN DEMİR
YÇYahya Hışman Çelik
Yahya Hışman Çelik
EKErol Kilickap
Erol Kilickap
AKAli Kalkanli
Ali Kalkanli
Aluminum and its alloys have become the most popular materials in applications aiming to provide lightness due to their low density. However, the low mechanical properties compared to other competitors are among the disadvantages of aluminum and its alloys. This is an important motivation factor in researching strength increasing mechanisms in aluminum and its alloys. In this study, the effects of reinforcement ratio and type on the microstructure, mechanical properties, and wear behavior of the AA7075/B4C composite produced by squeeze casting method were investigated. Two types of materials were produced and compared—non-reinforced AA7075 alloy and AA7075 allo matrix composite reinforced by 4, 8, 10, and 12 wt% B4C. Microstructures of two materials were analyzed by optical microscope, scanning electron microscope and energy distribution spectrometer. In addition, the mechanical and tribological properties of these materials were investigated. Microstructure and scanning electron microscope analysis reveals that the increasing B4C reinforcement ratio increased the tendency of agglomeration in the matrix. Although B4C reinforcement tends to agglomerate, B4C reinforcement positively affected the AA7075 alloy's hardness, tensile and bending strengths, elasticity modules, and wear resistance.

25 October 2024 in Advanced Engineering Materials
Verified
Journal Article
Open access
MDMEHMET EMİN DEMİR
MEHMET EMİN DEMİR
MOMustafa Okumuş
Mustafa Okumuş
The shift from traditional, single‐component metals and alloys continues, and researchers are currently investigating alternative materials. This evolution has led to the creation of innovative materials, including hybrid metal‐matrix composites. The present study aims to investigate the microstructural, surface morphological, and thermal properties of a novel Al7075/TiO2/Kaoline hybrid metal‐matrix composite prepared using high‐energy ball milling and sintering methods. In this study, phases related to the composite components are formed depending on the milling time, no undesirable phase is formed, but the peak intensities decreas as the milling time increases. Particle size increases from 63 to 215 μm with increasing milling time. Increasing the kaoline reinforcement ratio and sintering temperature increases the microhardness from 62.27 ± 2 to 75.83 ± 2 HV, and reduces the friction coefficient from 0.82 ± 0.01 to 0.62 ± 0.01. The wear rate of the composite without kaoline addition is 2.1 (mm3 m−1) × 10−3, while with 6 wt% kaoline addition, it decreases to 1.5 (mm3 m−1) × 10−3. There are no cracks in the composite other than plastic deformation due to sintering and wear. Peaks indicating endothermic and exothermic reactions during continuous heating occurr in the 635–750 °C temperature range.

9 May 2022 in Arabian Journal for Science and Engineering
Verified
Journal Article
Closed access
PDF file
MDMEHMET EMİN DEMİR
MEHMET EMİN DEMİR
YÇYahya Hışman ÇELİK
Yahya Hışman ÇELİK
AKAli Kalkanlı
Ali Kalkanlı

1 April 2025 in Polymer Composites
Verified
Journal Article
Open access
MDMEHMET EMİN DEMİR
MEHMET EMİN DEMİR
The application of natural fiber‐reinforced composite (NFRC) is growing rapidly in various industrial sectors, such as automotive, packaging, and construction materials, because of its affordability and excellent mechanical properties. This study investigates the effects of tungsten carbide (WC) and zinc oxide (ZnO) filler content on the mechanical and wear performance of jute/flax‐reinforced hybrid composites. WC filler enhanced the tensile stress of composites more effectively than ZnO filler. Adding 1% WC and 1.5% ZnO enhanced the tensile strength of the unfilled composite by 41% and 24%, respectively. Wear tests conducted under various parameters revealed that increasing the load reduced the coefficient of friction (COF) but increased the wear rate and mass loss for both neat and filled composites. The lowest COF values were observed in WC‐filled composites. It was observed that ZnO and WC‐filled composites exhibited less matrix deformation, pitting, and porosity compared to neat composites. Impact resistance improved with the addition of ZnO and WC fillers, with the impact strength of 1.5% WC‐filled hybrid composites increasing from 4.5 to 10.3 J/m2. The experimental wear rate and COF closely matched the predicted values acquired from the model, demonstrating the success of the artificial neural network (ANN) model in precisely estimating COF and wear rate values.Highlights: The addition of fillers improved the mechanical properties of hybrid composites. Exceeding optimum filler ratio negatively affects the mechanical properties. Adding fillers has improved the wear resistance of jute/flax composites. Artificial neural network model strongly correlates with experimental results. Infrared spectroscopy analysis validated the interaction between filler and epoxy.

26 November 2019 in Journal of the Brazilian Society of Mechanical Sciences and Engineering
Verified
Journal Article
Closed access
PDF file
YÇYahya Hışman Çelik
Yahya Hışman Çelik
MDMEHMET EMİN DEMİR
MEHMET EMİN DEMİR
EKErol Kilickap
Erol Kilickap
AKAli Kalkanli
Ali Kalkanli