Yazar "Unal, Huseyin" seçeneğine göre listele

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    A study of the cell morphology and mechanical properties of bumper material PP-T-EPDM composite foam
    (Sage Publications Ltd, 2023) Yetgin, Salih Hakan; Unal, Huseyin
    In this study, cellular polypropylene based composite foams were prepared using an universal injection moulding machine. The chemical foaming agent was added to neat polypropylene (PP) polymer, talc filled polypropylene (PP-T) composite and talc filled polypropylene/ethylene-propylene-diene blend (PP-T-EPDM) composite materials at the ratio of 1% and 2% by weight. The influence of foaming agent content on the mechanical and cellular properties of both neat PP polymer and PP composites was investigated. The results showed that the tensile strength, tensile modulus, impact strength, hardness, cell diameter, foam density and viscosity values and skin layer thickness decreased while volume expansion ratio increased with the increment in chemical blowing agent content.
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    Analysis of Tribological Properties of Tin Powder Filled Polypropylene Composites with Taguchi Method
    (Polymer Soc Korea, 2022) Gulesen, Mustafa; Kacal, Alaattin; Unal, Huseyin; Yetgin, Salih Hakan
    The tribological behavior of polypropylene polymer composites filled with Tin powder as fillers was studied using a pin-on-disc wear test rig at dry sliding conditions. The influence of wear process parameters like materials type (MT), applied load (AL), and sliding speed (SS) on the coefficient of friction (CoF) and specific wear rate (SWR) were investigated. A plan of experiments based on Taguchi technique performed to acquire data in a controlled way. An orthog-onal array and analysis of variance (ANOVA) employed to investigate the influence of process parameters on the wear of these composites. The results showed that Tin powder's addition as filler materials in polypropylene composites increased the specific wear resistance of the polypropylene composite significantly.
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    Determination of the Effect of Sliding Speed on Tribological Performances of Carbon Fiber Reinforced, Graphite and PTFE Filled Poly-ether-ether-ketone (PEEK) Polymer Composite
    (Konya Teknik Univ, 2022) Maslavi, Ahmet; Unal, Huseyin; Yetgin, Salih Hakan
    Machine elements such as plastic-based bearings, rollers and bushings are used in machines used in different industrial sectors. The sliding speed and carrying loads of the machine elements in these applications determine the life of the material. In this experimental study carbon fiber reinforced and graphite and poly-tetra-flour-ethylene (PTFE) filled poly-ether-ether-ketone (HPV-PEEK) polymer, which is among the high performance engineering plastics used in bearings, rollers and bushings were used to determine tribological performances. AISI 304 stainless steel counter disc was used in the tests, the experiments were carried out under dry sliding conditions and at room temperature. Tribological tests were carried out on a pin-on-disc wear test machine under 3.53 MPa and at low (1.0 m/s) and high (4.0 m/s) sliding speeds. According to the wear test results, the friction coefficient decreased while wear rate values increased with the increase in sliding speed values. In general, the friction coefficient was obtained between 0.14 and 0.19, while the specific wear rate varied between 1.66x10(-6) and 0.48x10(-6) mm(3)/Nm. While abrasive wear mechanism was observed in HV-PEEK polymer at low sliding speed values, adhesive wear mechanism was observed at high sliding speed values.
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    Investigation of tribological performance of PAI and PAI/graphite/PTFE composites under different mediums and working conditions
    (Emerald Group Publishing Ltd, 2025) Unal, Huseyin; Yetgin, Salih Hakan; Yilmaz, Yasin; Findik, Fehim
    PurposeThis study aims to investigate the tribological performance of neat polyamide-imide (PAI) and PAI composite (PAI + 12% graphite + 3% polytetrafluoroethylene [PTFE]) under varying mediums and conditions, including dry sliding, distilled water and seawater lubrication, to determine their suitability for high-stress applications.Design/methodology/approachTribological tests were conducted using a pin-on-disc setup with AISI 316 L stainless steel (SS) as counterface. Experiments were carried out under loads of 150 and 300 N and sliding speeds of 1.5 and 3.0 m/s. Values of temperatures, friction coefficients and wear rates were recorded to analyze the effect of fillers and lubrication mediums.FindingsThe PAI composite outperformed the neat PAI under all conditions, showing significant reductions in friction coefficients and wear rates. Seawater lubrication yielded the best results, achieving friction coefficients of 0.05 and 0.01 and specific wear rates of 18.10-16 m(2)/N and 1.10 -15 m(2)/N, for neat PAI and PAI composite, respectively. Graphite and PTFE fillers enhanced lubrication, reduced surface temperatures and mitigated abrasive and adhesive wear mechanisms. Superior cooling and lubrication effects of the seawater contributed to these improvements.Originality/valuePrevious studies mainly focused on dry sliding and distilled water lubrication for the PAI and its composites, with no research on the seawater conditions. This study compares the tribological behaviors of the neat PAI and PAI composite against AISI 316 L SS under dry sliding, distilled water and seawater lubrication.Peer reviewThe peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-08-2024-0302/
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    Mechanical and Tribological Performance of Polypropylene/Tin Powder Composites
    (Natl Inst Science Communication-Niscair, 2022) Gulesen, Mustafa; Yetgin, Salih Hakan; Unal, Huseyin
    In this study, the effect of Tin powder filler content on the mechanical and tribological performance of Tin filled Polypropylene (PP) composites were investigated. Polypropylene composites were prepared in a Brabender kneading chamber. The melt was transferred to a laboratory hot press and compression molded into samples for tests. The mechanical performances of the polymer based composites were determined by tensile and notched izod impact tests. The tribological tests were carried out in dry condition using pin-on-disc at 0.5-1.5 m/s Sliding Speed (SS) and 10-30 N loads. The mechanical test results demonstrated that the incorporation of Tin powders increased the Tensile Strength (TS) (5.6%), tensile modulus (TM) (19.8%) and izod Impact Strength (IS) (41.8%) while decreased the Elongation at Break (EB) (80%) values of Tin powder filled PP composites. The Friction Coefficient (COF) and Specific Wear Rate (SWR) decreased with the increase in filler content. The COF of unfilled PP, PP-8% Tin powder, PP-16% Tin powder and PP-24% Tin powder composites decreased about 20%, 23.4%, 21.8% and 29.3% with the increase in applied load from 10 N to 30 N. The SWR of the Tin powder filled PP composites decreased by 91% compared to unfilled PP polymer at 1.5 m/s speed and 30 N load value.
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    The effect of nanoclay filler addition on the foaming and mechanical properties of polypropylene
    (Wiley, 2024) Yetgin, Salih Hakan; Unal, Huseyin; Ermis, Kemal
    In this study, onium-ion-added nanoclay (NC)/microcellular polypropylene (PP) composites were created using a conventional injection molding machine. A chemical foaming agent was utilized to facilitate mixing. The primary focus was to analyze how altering the NC content affects the mechanical characteristics and the properties of the endothermic chemical foaming agent added PP/NC composites. The composites were created using a chemical foaming agent at a weight ratio of 1 wt% and NC at weight ratios of 0 wt%, 2.5 wt% and 5 wt%. The findings indicated that an increase in the NC ratio led to higher cell count and cell density, along with a reduction in cell diameter. Additionally, the outcomes demonstrated that the foaming of PP/NC composites resulted in decreased modulus of elasticity and tensile strength while enhancing impact strength. (c) 2024 The Authors. Polymer International published by John Wiley & Sons Ltd on behalf of Society of Industrial Chemistry. The addition of nanoclay to polypropylene polymers resulted in an increase in tensile strength, modulus of elasticity, cell number and density, and a decrease in impact strength, skin layer thickness and cell diameter. image