Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Kismet, Yilmaz(5)
- Akgül, Melek(4)
- Etli, Serkan(4)
- Taşgın, Yahya(4)
- Çelık, Ertugrul(4)
- Doğan, Akar(3)
- Torgut, Gulben(3)
- Tunç, Büşra(3)
- Dal, Murat(2)
- Furtana, Beyza(2)
- Güneş, Çağdaş(2)
- Kaymaz, Kürşat(2)
- Polat, Berivan Yılmazer(2)
- Somunkıran, İlyas(2)
- Yilmaz, Ersen(2)
- Akın, Erhan(1)
- Arıcı, Erdinç(1)
- Aydin, Handan(1)
- Aydin, Ilhan(1)
- Aydogdu, Burcu(1)
- Aytar, Mehmet(1)
- Ağar, Salih(1)
- Aşkın, Muzaffer(1)
- Boztuğ, Ali(1)
- Celik, Ertugrul(1)
- Cetin, Mehmet(1)
- Cihangir, Salih(1)
- Dehghanpour, Heydar(1)
- Doğan, Fatih(1)
- Doğan, Orhan(1)
- Ergin, Şefika(1)
- Gul, Muhammet(1)
- Gökkoruk, Ali(1)
- Güler, Seval Hale(1)
- Gülmez, Nihan(1)
- Güngör, Hiranur(1)
- Güray, Serhat(1)
- Gürler, Nedim(1)
- Hansu, Osman(1)
- Ince, Ragip(1)
Yayınlar
- MakaleAçık Erişim2026Effect of Temperature on the Fracture Characteristics of Hot Mix Asphalt Mixtures Using the Semi-Circular Bend (SCB) Test
Ince, Ragip; Furtana, Beyza; Yılmaz, Mehmet
This study investigates the temperature-dependent fracture behavior of hot mix asphalt using the Semi-Circular Bend (SCB) test and nonlinear fracture mechanics principles. SCB specimens prepared from gyratory-compacted mixtures were notched at three depths and tested at four different temperatures (23 °C, 0 °C, -11 °C, and -22 °C). The Two-Parameter Model (TPM), the compliance approach, and the J-integral method were employed to determine nonlinear fracture parameters, including fracture toughness, effective crack length, elastic modulus, and critical crack tip opening displacement (CTODc). Load CMOD curves were analyzed to determine elastic modulus from initial compliance values, while nonlinear fracture toughness was calculated based on equivalent crack length at peak load. Results showed that temperature is the most dominant variable influencing fracture behavior, explaining more than 75% of the observed variation. As the temperature decreased, the elastic modulus and fracture toughness significantly increased, indicating stiff and brittle behavior, whereas higher temperatures led to increased CTODc and more ductile fracture characteristics. The findings demonstrate that nonlinear fracture mechanics and TPM provide reliable and physically meaningful fracture characterization for asphalt mixtures. The outcomes highlight the importance of temperature in pavement fracture performance and confirm that nonlinear fracture approaches are useful tools for performance-based asphalt pavement design, particularly in cold climate regions susceptible to thermal cracking.
- MakaleYalnız künye2025The Investigation of the Weldability of Ti6Al4V Alloy with Different Stainless Steel Series Using Copper Interlayer via Friction Welding
Çelık, Ertugrul
Friction welding is a solid-state welding method used for joining metals with different properties, providing minimal thermal deformation in welded joints. Based on this advantageous feature of friction welding, this study investigates the weldability of Ti6Al4V alloy with 316L, 316Ti, 310, 430, and 304 series stainless steels using a Cu powder interlayer. Following the experimental procedures, the microstructures of the materials were analyzed using SEM-EDX, their macrostructures were visually inspected for physical changes, microhardness measurements were taken, and tensile tests were performed. It was observed that the Cu powder interlayer significantly influenced the reactions and bonding between the materials, playing a crucial role in both microstructure and mechanical properties. In this study, successful joining results were achieved using the friction welding method, and the microstructural characteristics and mechanical performance of the welded joints were thoroughly evaluated. Upon examining the microhardness results, no significant variations in hardness values were observed on the Ti6Al4V side.
- MakaleAçık Erişim2025Investigation of the Effect of Liquid Phase on Hot Pressed Bronze-Nickel-Cobalt Matrices
Çelık, Ertugrul; Tunç, Büşra
In this study, a metal matrix composite material consisting of 80% bronze, 15% nickel (Ni), and 5% cobalt (Co) was produced. Bronze is commonly known as a copper-tin alloy and offers high corrosion resistance and mechanical durability. Nickel enhances corrosion and oxidation resistance in metal matrix composites, while cobalt improves hardness and wear resistance. The composite material was further enriched with AgCd alloy in proportions of 2%, 4%, and 6%. The material production process involved the application of the liquid phase sintering technique using hot pressing. This method enables the achievement of high density and good mechanical properties. Sintering was conducted at different temperatures (650, 700, 750°C), and the effect of temperature on the microstructural characteristics of the material was investigated. During the analysis phase, the microstructure of the material was examined using SEM and elemental analysis was performed using EDS. Hardness testing was employed to evaluate the mechanical durability of the material. Density, defined as the mass-to-volume ratio, provided information about the material's internal structure. Three-point bending tests measured the bending strength of the material, while fracture surface analysis revealed the material's fracture behavior. XRD was used to determine the crystalline structure and phase composition of the material. The results demonstrated the effects of temperature variations and Ag-Cd addition ratios on the microstructure and mechanical properties of the composite material. Significant improvements in the material's durability, hardness, and other physical properties were observed due to the liquid phase sintering and hot pressing processes.
- MakaleAçık Erişim2024Harç atığı ikameli mikro betonlarda sertleşmiş hal ve mikroyapı değerlendirilmesi
Akgül, Melek; Hansu, Osman
İnşaat yıkıntı atığının sürdürülebilirlik ve geri dönüşüm süreçlerine dahil edilme çalışmaları özellikle yıkım gücü büyük depremler ve kentsel dönüşüm stratejileri sonrası hız kazanmıştır. Bu deneysel çalışmada, İnşaat Harç Atığı (HA)’nın CEM-I 42,5R çimentoya hacimce değişken oranlarda ikame edilmesi ile tasarlanan Mikro Beton (MB)’ların fiziksel, mekanik, durabilite ve mikroyapı özellikleri incelenmiştir. HA çimentoya hacimce %0, %5, 10, 15, 20, 25, 30 oranlarında ikame edilmiştir. Referans setinde kullanılan bağlayıcı miktarı 830 kg/m3’tür. Tüm MB karışımlarında su ve Silis Dumanı (SD) miktarı sabittir ve sırasıyla 400 kg/m3 ve 150 kg/m3 olarak tasarımda kullanılmıştır. 20 ± 2 °C sıcaklıkta kirece doygun su kürü 7 ve 28 gün olmak üzere iki farklı periyotta uygulanmıştır. Ayrıca birer takım numune 28 gün su kürü sonrası 56. ve 90. güne kadar laboratuvar ortamında bekletilmiştir. İlgili deney günlerinde sertleşmiş numuneler ile bir dizi fiziksel, mekanik ve durabilite deneyleri gerçekleştirilmiştir. Mikroyapı analizi değerlendirmeleri 28 günlük su kürü sonrası %0, %15 ve %30 HA ikameli numuneler ve karışımda kullanılan HA’nın X-ışını Difraktometresi (XRD) verilerden sağlanmıştır. Tüm veriler karşılaştırmalı grafikler ile sunulmuştur. Sonuç olarak, %10 HA’nın ikame edildiği 7 ve 28 günlük numunelerde mekanik özellikleri iyileşmesine rağmen, bu oran dahil tüm ikame oranlarında ve sonraki yaşlarda mukavemet kayıpları gözlenmiştir.
AtıfOpenAlex2TR Dizin1
İncele - MakaleAçık Erişim2024Comparison of Characteristics and Antimicrobial Activity of Synthesized Zinc Oxide And Magnetite Iron Oxide Nanoparticles Using Four Different Plant Extracts
Aytar, Mehmet; Aydogdu, Burcu; Unal, Ilkay
The aim of this study was to synthesize Zinc oxide (ZnO) and magnetite ıron oxide (Fe3O4) nanoparticles utilizing a precipitation method, employing plant extracts from Ocimum basilica(1), Cinnamomum zeylanicum(2), Lactarius salmonicolor(3) and Paeonia kesrouanensis(4) as reduction and stabilizing agents. Additionally, the antimicrobial activity of these nanoparticles against both gram-positive (S. aureus, ATCC 25923) and gram-negative (E. coli, ATCC 25922; P. aeroginosa, PAO1), bacteria as well as fungus (C. albicans 90028) was evaluated. The nanoparticles (NPs) were characterised by various analyses, including TEM, SEM, XRD, FTIR, DSL, and zeta potential. Based on the TEM image, the ZnONPs exhibited a cluster of flower-like structures, whereas the Fe3O4NPs displayed a spherical shape with a varying size distribution. The zeta potential values for ZnO NPs ranged from -5.35 to -16.9, while for Fe3O4NPs ranged from -7.43 to -20.7. All ZnO nanoparticles exhibited antimicrobial activity exclusively against the S. aureus strain, whereas Fe3O4NPs did not demonstrate any antibacterial effect.
AtıfOpenAlex4TR Dizin1İncele - MakaleAçık Erişim2024Effect of Ground Diatomite on Early Strength of Self-Compacting Mortars
Karabulut, Büşra; Yon, Merve Sahin; Karataş, Mehmet
Portland cement fabrication is a significant factor that increases the amount of carbon dioxide released into nature. For this reason, it is very important to use natural and waste materials with pozzolanic properties instead of portland cement. In this article, the usability of diatomite rock, a natural pozzolanic material that can be substituted with portland cement, in the manufacture of self-compacting mortar was studied. In the experimental study, prismatic specimens with dimensions of 40 × 40 × 160 mm were used to examine the impact of ground diatomite on the early age mechanical properties of self-compacting mortar; it was produced by replacing 0%, 5%, 10%, 15%, 20% of diatomite with portland cement, respectively. The slump-flow test to obtain self-compacting mortar was conducted according to the European Federation of Specialized Construction Chemicals and Concrete Systems guidance. Specimens prepared using 0%, 5%, 10%, 15% and 20% diatomite were cured in water at 23±2 ̊C temperature for 3 days. 3-day (early age) flexural and compressive strength worths were gained for the samples whose curing period was completed. As a result of this experimental study, it was specified that the highest strengths were in the series containing 5% diatomite, exceeding the reference samples. Additionally, it has been determined that mechanical strength decreases when the diatomite ratio in mixtures is more than 5%.
AtıfOpenAlex1İncele - MakaleAçık Erişim2023Saman Takviyeli Yüksek Yoğunluklu Polietilen Kompozitlerin Mekanik Özellikleri ve Su Emme Kapasitelerindeki Değişimlerin İncelenmesi
Kismet, Yilmaz; Doğan, Akar
Bu çalışmada, poliolefinler grubunun önemli bir üyesi olan yüksek yoğunluklu polietilen ile saman bitkisinden oluşan kompozitler üretilmiştir. Kompozit malzemeler, yüksek yoğunluklu polietilen içerisine saman takviyesi ağırlıkça %5, %10 ve %20 oranlarında takviye edilerek üretilmiştir. Bu karışımlar öncelikle mekanik olarak karıştırılmış daha sonra homojen bir karışım oluşturabilmek için 160 ila 180 oC sıcaklıklar arasında ekstrüzyondan geçirilmiştir. Ekstrüzyon sonrası elde edilen karışım önce soğutma havuzunda soğutulmuş daha sonra kırıcıdan geçirilerek granül hale getirilmiştir. Elde edilen bu granüller plastik enjeksiyon makinasında kalıplara basılarak standart test numuneleri üretilmiştir. Üretilen kompozitlerin takviye malzemesi oranı ile mekanik özelliklerindeki ve su emme kapasitelerindeki değişimler incelenmiş ve sonuçlar grafik ve tablo olarak verilmiştir. Kompozit malzemlerin çekme mukavemtleri, üç nokta eğilme mukavemetleri ve izod darbe dayanımları analiz edilmişdir. Malzemelerin çekme ve izod darbe dayanımları azalırken, eğilme mukavemetinde iyileşme gözlenmiştir.
AtıfOpenAlex1İncele - MakaleAçık Erişim2023Comparative Analysis of Composite Buildings Produced in National and International Standards
Etli, Serkan; Akgül, Melek
Composite moment resisting frame buildings with 5-, 10-, 15- and 20-story concrete filled steel tube columns and composite beams were modelled. The buildings are designed according to Turkish Code for Design and Construction of Steel Structures-2016 (TCDCSS-2016) and Türkiye Building Earthquake Code-2018 (TBEC-2018) regulations at high ductility levels. The design of the DCH structures was designed in ZC ground for a 0.79 g PGA. While choosing the design location, it is assumed that the construction will be made in a region between the North Anatolian fault line and the East Anatolian fault line, that is, in a region with high earthquake risk. Within the scope of the study, SeismoStruct [1] software was used during the design and performance evaluation of the structures. Nonlinear static push and incremental dynamic analyses were used. Uniform and triangular load distributions were adopted in the PO analysis, and 16 earthquake ground motions were used in the dynamic analysis. The effect of story number on the seismic behavior of CMRFs was investigated using nonlinear analysis results. Accordingly, variation in lateral response, overstrength factors, ductility, and section capacity change of members for CMRF structures were presented. In addition, a mutual evaluation was made with the performance parameters obtained from previous studies with similar geometries.
AtıfOpenAlex3TR Dizin2İncele - MakaleAçık Erişim2023Investigation of Structural, Morphological and Magnetic Properties of Equi-molar Fe-Si-Cu/Nb (at.%) Nanocrystals Synthesized by Mechanical Alloying
Simsek, Tuncay; Güler, Seval Hale
In this study, equimolar nanocrystalline Fe-Si-Cu (at.%) and Fe-Si-Nb (at.%) alloys were synthesized under an Argon atmosphere by a mechanical alloying method. Experimental parameters were determined as 350 rpm, 10:1 BPR, 120 hours. Phase structures of the synthesized alloys were investigated by X-Ray diffractometry, morphology and elemental analyzes were investigated by SEM-EDS, and magnetic properties were investigated by vibrating sample magnetometer (VSM) technique at room temperature. The crystallite size of the Fe-Si-Cu alloy was found to be 102.3, 22.5, 15.9 and 8.6 nm at the beginning of grinding, after 30, 60 and 120 hours grinding, respectively, and the lattice strains were 0.164%, 0.510%, 0.672% and 1.165%, while the Fe-Si-Cu alloy For the Nb alloy, the crystallite sizes were calculated as 140.8, 42.9, 16.8 and 7.8 nm, and the lattice strains were calculated as 0.134%, 0.301%, 0.639% and 1.271%. According to the magnetism results, the saturation magnetization (Ms) of the Fe-Si-Cu (at.%) alloy was found to be 3146 emu/g, while the saturation magnetization of the Fe-Si-Nb (at.%) alloy was found to be 8.91 emu/g. It was determined that Nb addition to the Fe-Si alloy system caused an increase in the coercivity values.
- MakaleAçık Erişim2023Experimental investigation and numeric modelling of the impact performance of basalt fiber reinforced geopolymer concrete
Polat, Berivan Yılmazer; Güngör, Hiranur
Geopolymer concrete (GC) has been found to have better results than Portland cement concrete (PCC), including lower carbon dioxide emissions, higher compressive strength, and greater durability. The study aims to determine the effects of basalt fiber on GC due to the impact caused by the sudden loading effect. Samples were prepared with different mixing ratios for the experimental process, with PCC used as the control sample. Basalt fibers were added to the samples in three different ratios based on optimal mixing ratios determined through physical and mechanical tests, such as UPV (Ultrasonic Pulse Velocity), compressive strength, and flexural strength. Subsequently, fibrous samples were analyzed using SEM (scanning electron microscopy) and EDS (energy dispersive spectroscopy). A drop-weight experiment was conducted on GC plates measuring 50×50×5 cm, which contained two different fiber ratios that yielded the best mechanical and physical properties. The results were analyzed using numerical modeling methods. No changes in content were made. The sample with the highest impact resistance was found to be the 2% basalt fiber-reinforced GC, with a displacement value 21.21% lower than PCC. The language used is clear, concise, and objective, with a formal register and precise word choice. The text follows a logical structure with causal connections between statements and adheres to conventional academic formatting and citation styles. The ANSYS modeling results indicated an 89.63% similarity with the experimental data regarding the displacement values. Additionally, the study demonstrated that the inclusion of basalt fiber additives enhances the impact resistance of geopolymer concrete. Furthermore, numerical modeling can predict the impact behavior of concrete to a significant extent, eliminating the need for experimental processes.
- MakaleAçık Erişim2023Numerical Analysis of Double Geopolymer Concrete Layer with Different Properties
Polat, Berivan Yılmazer
Researchers have been working to find alternatives to conventionally produced concrete in recent years. Geopolymer concretes are also the focus of these studies. There are not enough studies on modelling geopolymer concretes, which are the subject of many experimental studies. In this study, which is believed to close the gap in the literature, stress and strain analyses of geopolymer concrete with two different properties under load in two different systems were performed. The locations of the concrete with different properties were also changed in the model, and the results obtained in both cases were compared. It was observed that when the geopolymer concrete with a lower modulus of elasticity and 100% slag content was on top, the stress values decreased, and the strain rates increased.
- MakaleAçık Erişim2023Nadir Toprak Elementlerinin Karbon Elyaf Tozu Takviyeli Poliolefinlerin Akışkanlığına Etkileri
Kismet, Yilmaz; Güray, Serhat
Bu çalışmada, poliolefinler grubuna ait ticari birer termoplastik olan alçak yoğunluklu polietilen (AYPE), yüksek yoğunluklu polietilen (YYPE) ve polipropilenin (PP) akışkanlığı üzerine karbon elyaf tozunun ve nadir toprak elementlerinin etkileri incelenmiştir. Öncelikle mekanik olarak karıştırılan ağırlıkça %5, %10 ve %15 oranlarında karbon elyaf tozu içeren termoplastiklere ait karışımların eriyik akış analizleri yapıldı. Daha sonra AYPE, karbon elyaf tozu ve %90’nın üzerinde zenginleştirilmiş lantan ve seryum ile çözeltiler hazırlandı ve bunların akışkanlıkları incelendi. Bu çözeltiler hazırlanırken AYPE sentetik tinerde, lantan ve seryum ise su da çözündü ve sonra karbon elyaf tozu takviye edildi. Hazırlanan bu çözeltiler saf termoplastikler (AYPE, YYPE, PP) ile ayrı ayrı ağırlıkça %10, %20, %30, %40 ve %50 oranlarda karıştırılarak akışkanlık ve yoğunluk analizleri gerçekleştirildi. Bu şekilde hem karbon elyaf tozu hem de lantan ve seryum emdirilmiş karbon elyaf tozlarının termoplastiklerin akışkanlık ve yoğunluğu üzerine olan etkileri belirlenerek elde edilen sonuçlar grafiklerle açıklandı.
AtıfOpenAlex1İncele - MakaleAçık Erişim2023Behaviour of Composite Buildings Designed with TBDY 2018 in Main and Aftershocks
Etli, Serkan; Akgül, Melek
Within the scope of the study, the designs of the structures consisting of 5, 10, 15 and 20 story moment resisting composite frames were carried out for TBDY 2018 and ZA group soils. The behavior of the designed structures was evaluated by using dynamic analysis in the time history domain. The earthquakes used were selected in series consisting of the main earthquake and aftershocks. The results obtained were evaluated in terms of roof displacements, base shear coefficients, interstory drift and base accelerations. The structures examined within the scope of the study show excellent behavior under the influence of the main and aftershocks.
AtıfOpenAlex1TR Dizin2İncele - MakaleAçık Erişim2023Experimental investigation of engineering properties of silica sand filled mortars containing high doses of SWCNT
Subaşı, Serkan; Dehghanpour, Heydar; Maraşlı, Muhammed; Doğan, Fatih
Recently, great efforts have been made by researchers on the mixture of electrically conductive concretes that have been developed for different purposes. In this study, an experimental research was carried out on electrically conductive mortar mixtures especially for shell elements produced for building facade cladding. Six different mixtures were produced, including the non-conductive reference mixture. Single-walled carbon nanotube (SWCNT) was used as nano-sized conductive additive material. SWCNT was added at 0.2% and 0.3% of cement weight. SF was added to the same mixtures as another group at the rate of 4% by total weight. 2, 14, 28, 90 and 180 days electrical resistivities of the obtained conductive mortar samples were measured. As a non-destructive method, dynamic resonance testing was performed and the 28-day damping rates of the samples were determined. Ultrasonic pulse velocity (UPV) and Leeb hardness tests were performed, respectively, by using other non-destructive testing methods to obtain information about the internal structure voids and surface hardness of the samples. SWCNT, which causes low machinability and therefore internal structure voids, caused a decrease in compressive strength and flexural strength, as well as a significant increase in electrical conductivity.
AtıfOpenAlex1İncele - MakaleAçık Erişim2023Reclaim of Wrecked Bi-Te Based Materials In Peltier Modules In Thermopower Properties By Mechanical Milling
Yüzüak, Ercüment; Cetin, Mehmet; Yüzüak, Gizem Durak
We thoroughly evaluated the effects of various treatments on the structural and electrical properties of the two as-cast materials, “Sb-doping Bi-Te (p-type)” and “Se-doping Bi-Te (n-type)” which are frequently present in abandoned Peltier modules. To investigate the thermoelectric properties of Bi2Te3-based materials, waste alloys characterized by electrical conductivity using the hot-end method. Alloys were purified by performing arc melting on a water-cooled copper crucible in a vacuum of at least 10-3 mbar, with five times melting sessions to assure homogeneity. A single and long milling period of 144 hours is applied. After the compressing operation, the resulting discs with nanostructures were annealed for an hour at 600 K under vacuum conditions. The discs' structural properties were characterized using X-ray diffraction (XRD) and their surfaces and stoichiometries were determined using scanning electron microscopy with an energy dispersive feature. The Seebeck coefficient of the nanoparticle formed n-type Bi-Te based sample is -35.3 μV.K-1 and p-type Bi-Te based sample is 100 μV.K-1 (15% of mean error margin). It was found that a notable improvement was attained in comparison to the initial state with the addition of nanoparticles.
- MakaleAçık Erişim2023Effect of Longer Waiting Time During OCP and Pre-Applied Cleaning Potential In Corrosion Analysis of Zinc Metal
Cihangir, Salih
Tafel analysis is a widely accepted technique for corrosion studies in electrochemistry. A general literature search for one of the electronegative metals, zinc, revealed serious deviations in corrosion results. In order to understand the reasons behind these deviations, zinc metal was investigated at macro and micro levels during and after the Tafel corrosion analysis. In-situ macro surface investigation during the OCP period and Tafel analysis were performed, and it was found that the zinc surface undergoes proceeding corrosion attack following the immersion in 3.5 wt.% NaCl solution. In-situ macro surface analysis exhibited that the pre-oxidation of the surface proceeds as nonuniform at local regions. SEM-EDS and XRD analysis proved that the particular crystal planes of the zinc form ZnO with increasing immersion time. A linear sweep voltammetry (LSV) technique was applied to detect the oxygen removal and starting hydrogen evolution potentials. Three identical Tafel experiments were performed on samples without any treatment, and another three consecutive Tafel experiments were performed on the samples which applied pre-reduction potential. Obtained results revealed that in-situ pre-applied reduction potential just before the Tafel analysis cleaned the surface and allowed uniform oxide formation, resulting in the lowest standard deviation of the calculated Tafel elements.
AtıfOpenAlex8TR Dizin1İncele - MakaleAçık Erişim2023Doğal Elyaf Takviyeli (Jüt-Keten-Kenevir) Kompozit Malzemelerin Mekanik ve Metalografik Olarak İncelenmesi
Taşgın, Yahya; Kandemir, Seçkin
Teknolojinin gelişmesiyle birlikte özellikle polimer esaslı saf haldeki malzemelerin yetersiz kalmasından dolayı kompozit malzemeler geliştirilmiş ve zamanla kullanım alanları çoğalmıştır. Son yıllarda artan çevre bilincinin getirdiği üretimde sürdürülebilirlik ve yenilenebilir, çevre dostu kompozitlerin kullanımını giderek yaygınlaşmaktadır. İçeriğindeki malzemelerden en az birisinin doğal olması ile tanımlanan biyokompozitlerin, alternatiflerine kıyasla çok daha çevre dostu olmalarına karşın, hidrofilik yapıda olmaları ve mekanik özelliklerinin zayıf olması sebebiyle sanayide kısıtlı alanda kullanılmaktadır. Bu çalışmada takviye malzemesi olarak kullanıla bilirliğini ortaya koymak için jüt, keten ve kenevir den oluşan doğal lif takviyeli epoksi kompozitlerin (NFRC) mekanik ve metalografik açıdan ortaya koyduğu farkındalıklar incelenmiştir. Üretim yöntemi olarak vakum destekli reçine transfer kalıplama (VDRTK) metodu kullanılmıştır. Metalografik olarak incelediğimizde; doğal liflerin yapı içerisinde yer alması ve epoksinin ara yüzeylere nüfuziyeti açısından problem oluşturmadığı görülmüştür. Çekme testleri, kompozitler arasında farklı mekanik davranışları ortaya çıkarmıştır; keten kompoziti en yüksek çekme mukavemetini (75,56 MPa) jüt ve kenevirin ise ketene kıyasla düşük çekme mukavetine sahip olduğu görülmektedir. Endüstriyel olarak üretilen yapay elyaflara (Cam elyafı) kıyasla mekanik ve mikro yapı açısından zayıf görünse de özellikle karmaşık yapılı parçaların üretiminde nüfuziyet ve ara bölgelere yerleşebilecek olmasından kaynaklı daha kullanışlı olduğu ortaya çıkmıştır.
AtıfOpenAlex1TR Dizin1İncele - MakaleAçık Erişim2022Karışmaz PMMA/PS harmanlarının optik özelliklerine uyumlulaştırıcı etkisi
Yilmaz, Ersen
Karışmayan polimetil metakrilat/polistiren (PMMA/PS) harmanları değişik maleik anhidrit-stiren-metil metakrilat (MAStMMA) uyumlaştırıcı oranı (0, 2, 4, 6, 8 ve 10) eklenerek çözeltiden döküm yoluyla elde edilmiştir. Spektral sonuçlar, kırılma indisi (n), sönüm katsayısı (k) ve absorpsiyon katsayısı (µ) gibi optik sabitlerin terpolimer bazlı uyumlaştırıcı ilavesiyle arttığını göstermiştir. Diğer yandan optik enerji boşluğu Eg, anılan optik sabitlere göre zıt bir eğilim göstermiştir. Gözlenen en düşük enerji boşluğu %8 ila %10 uyumlaştırıcı oranı arasında belirlenmiştir.
AtıfOpenAlex2İncele - MakaleAçık Erişim2022Sıcak Presleme Yöntemi İle Üretilen Fe Esaslı Matriste Ni Esaslı Süper Alaşımların Katkı Oranlarının Etkisi
Somunkıran, İlyas; Çelık, Ertugrul; Tunç, Büşra; Güneş, Çağdaş
Doğal taş kesme işlemlerinde kullanılan elmaslı kesici takımlar da matris dizaynı; takımların kesme performansı açısından oldukça önem arz etmektedir. Bu çalışmada toz metalurjisi yöntemiyle Fe-Ni-Cu metal tozlarına ağırlıkça farklı oranlarda (%10-20-30) 9062 ve 9045 ticari kodlu nikel esaslı süper alaşımlar ilave edildi. Üretilen numunelerin mikro yapı ve bazı mekanik özellikleri incelendi. Deney numuneleri 920ºC sıcaklıkta 35 MPa basınç altında dört dakika süre boyunca sıcak preslendi. Elde edilen numunelerin sertlik, yoğunluk, üç noktalı eğilme testleri yapıldı. Mikroyapı incelemeleri için SEM (taramalı elektron mikroskobu), ve XRD kullanıldı. Numunelerin SEM görüntülerinde 9045 ve 9062 ticari kodlu Ni esaslı alaşım ile takviyelendirilmiş düzgün küresel tozların yapı içerisinde homojen dağıldığı ve en yüksek sertlik değeri 9062 grubu numunelerde olduğu gözlenmiştir.
AtıfOpenAlex1TR Dizin1İncele - MakaleAçık Erişim2022Viscometric Investigation of Compatibilizer Effect on Polyvinyl chloride/Polystyrene Blends
Yilmaz, Ersen; Boztuğ, Ali
In this study, polyvinyl chloride (PVC) and polystyrene (PS) polymers, which do not form a compatible blend with each other in certain concentration ranges and are widely used on an industrial scale, were used. The concentration range in which these two polymers do not form a compatible blend were determined viscometrically, and maleic anhydride-styrene (MAS) copolymer was added as a compatibilizing agent in this concentration range. The concentration range in which the polymer pair did not form a compatible blend was determined as 1.5 and 2.0 g dL-1. In this concentration range, 5.0 and 10.0 % MAS copolymer was added to the polymer couple and its compatibilizing effect was investigated. It was determined by viscometric method that the MAS copolymer was a good compatibilizer in the range where the polymer pair did not form a compatible blend.
AtıfOpenAlex1İncele