Profile URL: https://hdl.handle.net/20.500.13091/11834
Job Title:Arş. Gör. Uzm.
Email Address:actatar@ktun.edu.tr
Main Affiliation:02.10. Department of Mechanical Engineering
Status: Current Staff
ORCID:
0000-0003-4470-7801
0000-0003-4470-7801Scopus ID:
57201269662
57201269662YÖK Akademik: DF65B86B98E867B8
Google Scholar:
HULaPk4AAAAJ
HULaPk4AAAAJWeb of Science ID:
ABF-8771-2021
ABF-8771-2021Name Variants:
Tatar, Ahmet C. Tatar, A. Caner
10 results
Scholarly Output Search Results
Now showing 1 - 10 of 10
Article Citation - WoS: 11Citation - Scopus: 10Selectively Reinforced Functionally Graded Composite-Like Glass/Carbon Polymer Nanocomposites: Designed for Efficient Bending and Impact Performance(KOREAN FIBER SOC, 2021-08-10) Demir, Okan; Tatar, Ahmet Caner; Eskizeybek, Volkan; Avcı, AhmetOffshore wind turbine blades (OWTBs) are exposed to various types of loadings during their service life. Moreover, due to their tremendous size, huge investment costs are established, including advanced engineering materials and production process solutions. To decrease their investment cost without sacrificing their mechanical performances, advanced engineering solutions in the view of material selection and design should be implemented. With this motivation, we aimed to develop a novel laminated composite design considering reducing investment costs without compromising the bending and impact resistance of an OWTB. For this, an efficient and cost-effective design of a functionally graded composite (FGM)-like glass/carbon fibers reinforced hybrid polymer composite with a specific stacking sequence was presented. To evaluate mechanical performance of the composite structure, tensile, flexural, and to simulate environmental conditions, low-velocity impact tests were conducted. Furthermore, multi-walled carbon nanotubes (MWCNTs) were also introduced into the polymer matrix to evaluate their effectiveness in the hybridized composite. Drastic improvements in the bending strength (55.8 %) and strain (39.7 %) were obtained compared to the neat carbon fiber reinforced epoxy composites (CFs), especially with the aid of MWCNTs. According to impact tests, it was pointed out that it is possible to obtain higher impact peak forces (around 15 %) compared to neat CFs. However, MWCNTs contributed with slight increments in impact resistance but effectively restricted the impact damage propagation. This study reveals it is possible to tune the bending performance, the absorbed energy, and the damage extension by utilizing glass and carbon fiber laminates in an FGM-like structure.Article Citation - WoS: 4Citation - Scopus: 5Impact Response of Nanoparticle Reinforced 3d Woven Spacer/Epoxy Composites at Cryogenic Temperatures(SAGE PUBLICATIONS LTD, 2021-08-03) Yildirim, Ferhat; Tatar, Ahmet Caner; Eskizeybek, Volkan; Avcı, Ahmet; Aydın, MustafaFiber-reinforced polymer composites serving in harsh conditions must maintain their performance during their entire service. The cryogenic impact is one of the most unpredictable loading types, leading to catastrophic failures of composite structures. This study aims to examine the low-velocity impact (LVI) performance of 3D woven spacer glass-epoxy composite experimentally under cryogenic temperatures. LVI tests were conducted under various temperatures ranging from room temperature (RT) to -196 degrees C. Experimental results reveal that the 3D composites gradually absorbed higher impact energies with decreasing temperature. Besides, the effect of multi-walled carbon nanotube and SiO2 nanofiller reinforcements of the matrix on the impact performance and the damage characteristics were further assessed. Nanofiller modification enhanced the impact resistance up to 30%, especially at RT. However, the nanofiller efficiency declined with decreasing temperature. The apparent damages were visually examined by scanning electron microscopy to address the damage formation. Significant outcomes have been achieved with the nanofiller modification regarding the new usage areas of 3D woven composites.Article Citation - WoS: 29Citation - Scopus: 26An Experimental Evaluation on the Dynamic Response of Water Aged Composite/Aluminium Adhesive Joints: Influence of Electrospun Nanofibers Interleaving(ELSEVIER SCI LTD, 2022-01-01) Ulus, Hasan; Kaybal, Halil Burak; Berber, Nihat Erdem; Tatar, Ahmet Caner; Ekrem, Mürsel; Ataberk, Necati; Avcı, Ahmet; Erdem Berber, Nihat; Burak Kaybal, Halil; Caner Tatar, AhmetThe impact response of adhesives is a critical design parameter considering their lifetime. Additionally, environmental effects such as water or moisture may cause to degrade of the polymer-based adhesive and shorten its service life. This study aimed to investigate the impact response of water-aged aluminium-composite adhesively bonded single lap joints (SLJs). Nylon 6.6 nanofibers modified with graphene nanoplatelets (GNPs) were introduced in the adhesion areas to increase adhesive performance. The water aging resulted in decreased impact resistance in all cases. However, nanofiber-modified SLJs exhibited comparatively higher impact performance under both non-aged and water-aged conditions. Further, the GNP reinforced nylon 6.6 nanofibers increased the maximum impact load by 15 and 19% compared to neat nanofibers before and after aging, respectively. The fracture surfaces were examined via scanning electron microscopy (SEM) to understand damage and toughness mechanisms. A schematic model has been developed to explain the mechanisms leading to improved bonding performance by applying N6.6 nanofiber reinforcement to the adhesion zone.Article Citation - WoS: 28Citation - Scopus: 29The Effect of Halloysite Nanotube Modification on Wear Behavior of Carbon-Aramid Fiber Reinforced Hybrid Nanocomposites(WILEY, 2021-11-18) Çetin, Mehmet Emin; Baştosun, Yusuf; Tatar, Ahmet Caner; Çetin, Muhammet Hüseyin; Demir, Okan; Önal, Gürol; Avcı, AhmetIn this study, the carbon-aramid fiber reinforced hybrid composites are fabricated using a vacuum-assisted hand lay-up method using halloysite nanotubes (HNTs) modified epoxy matrix. Ball-on-disk wear tests are performed to analyze the tribological effect of neat and HNTs-added specimens at 10, 15, and 20 N loads and 1 m/s sliding speed. Additionally, the wear rate and friction coefficient results are obtained to investigate the effect of the HNTs on the tribological behavior of hybrid composites. The wear mechanism of neat and nanocomposite specimens is specified by scanning electron microscopy (SEM) images, and the elemental analysis of worn surfaces is performed using EDX. Finally, the surface morphology is evaluated with 3D topography images. Additionally, thermal camera images are used to identify the thermal conductivity effect of HNTs on wear. The wear test results show that HNTs-addition to composite decreased the friction coefficient by 9%, 10%, and 11% for 10 N, 15 N, and 20 N loadings, respectively. The wear rate is also decreased average by 75% for wear loadings. Surface form images acquired from 3D topography support the enhancement in the friction coefficient and wear rate values. Furthermore, thermal camera images show that thermal conductivity improvement on the contact region is attributed to well thermal properties of HNTs. Furthermore, the solid-lubricant characteristic of HNTs as forming tribofilm is determined as the main reason for the enhanced tribological performance of nanocomposites. Finally, a detailed wear mechanism is proposed to explain the wear behavior of HNTs-added carbon-aramid hybrid composites based on SEM images.Article Citation - WoS: 24Citation - Scopus: 25Effects of Extreme Low Temperatures on the Impact Behavior of Boron Nitride Nanofillers Added Carbon Fiber/Epoxy Composite Tubes(Sage Publications Ltd, 2022-10-28) Kara, Memduh; Tatar, Ahmet Caner; Kırıcı, Muhammed; Kepir, Yusuf; Günöz, Alper; Avcı, AhmetThis study aims to investigate the low-velocity impact response of boron nitride nanoparticles (BNNPs) added carbon fiber reinforced pipes (CFRPs) at various temperature values. Carbon fiber/epoxy composite specimens with (+/- 55 degrees)(3) winding angles were manufactured with the filament winding method. Low-velocity impact tests were performed with a 15 J energy level at five different temperatures between -196 degrees C and 23 degrees C ranges to understand the cryogenic environment effect on BNNP added carbon fiber reinforced tubes and neat carbon fiber reinforced tubes. The force-displacement and contact force-time graphs were attained in consequence of low-velocity impact tests. The damage areas, their size and characteristics were scrutinized both visually and with the aid of a Microscope. The test results showed that when ambiance temperatures decreased, the damage areas considerably increased both filled with BNNP and without BNNP filament wound carbon fiber reinforced tubes.Article Citation - WoS: 20Citation - Scopus: 27Effects of Cryogenic and Warm Temperatures on Quasi-Static Penetration Resistance of Carbon-Aramid Hybrid Nanocomposites Reinforced Using Halloysite Nanotubes(ELSEVIER, 2021-04-01) Çetin, Mehmet Emin; Tatar, Ahmet Caner; Demir, Okan; Önal, Gürol; Avcı, AhmetThe quasi-static penetration test of a composite structure aims to measure impact behavior under the out-of plane loadings without dynamic and rate effects. In this study, carbon-aramid reinforced nanocomposites were manufactured by vacuum-assisted resin transfer molding and hand lay-up techniques and characterized by quasi-static penetration tests. Halloysite nanotubes (HNTs) were added to epoxy resin as nanofillers. Quasi-static punch shear test (QS-PST) was performed using a 12.7-mm cylindrical punch with a 50.8-mm support span. QSPSTs tests were carried out at-50 degrees C,-25 degrees C, 0 degrees C, 25 degrees C, and 50 degrees C to determine the effect of temperature on quasi-static penetration behavior of neat and HNT-reinforced carbon-aramid nanocomposites. Absorbed energy values and penetration force-displacement curves were acquired from QS-PSTs for each sample. Photographs of the front and rear sides of the samples were taken and analyzed. Moreover, the samples were cut from the middle, and the damage throughout the thickness of the composite samples were examined. It was observed that for all test samples, damages increased when the temperatures decreased. For the same temperature, nano particle addition to the samples resulted in higher penetration force and less damage. We confirmed the possibility of increasing penetration resistance and energy absorption capacity by adding HNT to carbon-aramid fibers at cryogenic and warm temperatures.Article Citation - Scopus: 4Influence of Seawater on Mechanical Properties of Sio2-Epoxy Polymer Nanocomposites(2019) Kaybal, Halil Burak; Ulus, Hasan; Tatar, Ahmet Caner; Demir, Okan; Avcı, Ahmet; Avcie, AhmetIn this study, dispersion of nano SiO2 in epoxy composite aged in seawater and its effect on mechanical properties were studied. The SiO2-epoxy polymer nanocomposite materials were kept in seawater for a total of six months to be tested every two months. Tensile and bending tests were applied to composite materials as a mechanical test. According to the mechanical test results, there was less decrease in strength in SiO2-epoxy polymer nanocomposite material compared to unmodified material. In usage of seawater, the mechanical properties were observed to be the best in 3 % added SiO2-epoxy nanocomposite material.Article Citation - Scopus: 9Evaluation of Low-Velocity Impact Behavior of Epoxy Nanocomposite Laminates Modified With Sio2 Nanoparticles at Cryogenic Temperatures(2019) Tatar, Ahmet Caner; Kaybal, Halil B.; Ulus, Hasan; Demir, Okan; Avcı, AhmetEpoxy based fiber reinforced composites are widely utilized in aerospace applications due to mechanical properties, thermal stability and, chemical resistance. However, it is known that materials become brittle and due to the poor crack resist restricts their applications in cryogenic engineering applications. The purpose of this paper is to experimentally investigate the cryogenic temperatures’ effect on the low-velocity impact (LVI) test of composite laminates. In addition, the effect of matrix modification in the studied composites was investigated. The LVI tests were conducted at RT (room temperature), 0 °C, -50 °C, -150 °C and -196 °C (liquid nitrogen temperature) on the composite laminates to measure influence on their energy absorption capacity. LVI tests performed according to ASTM-D-7136 standard under 10, 20 and 30 J impact energy levels. The results show that the contact forces and energy absorption capacities are improved by adding SiO2 nanoparticles into the epoxy matrix. The absorbed energy at cryogenic temperatures is increased by 24.87% from 18.1 J of pure epoxy resin to 22.7 J of modified epoxy. For the purpose of comparison, the LVI properties of composites at room temperature (RT) are also investigated. It is noted that the energy absorption capacity is not higher at cryogenic temperatures than that at RT for the modified and neat epoxy composites. Moreover, the peak contact forces are reduced in low-temperature conditions.Master Thesis Saf Suyun Alüminyum-kompozit Levhaların Yapıştırma Bağlantılarındaki Naylon 6.6 Nanofiber Takviyeli Yapıştırıcılara Etkisi(Konya Teknik Üniversitesi, 2019) Tatar, Ahmet Caner; Avcı, AhmetBu yüksek lisans tez çalışmasında, birçok endüstriyel sektörde kullanılmakta olan epoksi yapıştırıcıların geliştirilmesi hedeflenmiştir. Cıvata veya kaynak bağlantısının uygun olmadığı Alüminyum 2024-T3 malzemesi ile karbon elyaf takviyeli kompozit malzemelerin yapıştırılmasında kullanılan epoksi yapıştırıcılar, saf naylon 6.6 ve grafen ilave edilmiş naylon 6.6 nanoelyaflar ile güçlendirilmiş ve saf suyun bu yaptırıcılar üzerine etkisi araştırılmıştır. Deney Numunelerinin hazırlanmasında ilk olarak saf naylon 6.6 ve ağırlıkça %1, %3 ve %5 grafen nano partiküller (GNP) içeren naylon 6.6 nanoelyaflar elektro-eğirme yöntemiyle üretilmiştir. Üretilen nanofiberler fourier dönüşümlü infrared spektrometre (FT-IR), diferansiyel taramalı kalorimetri (DSC), taramalı elektron mikroskobu (SEM) ve geçirmeli elektron mikroskobu (TEM) ile karakterize edilmiştir. Nanopartiküllerin nanofiberler içerisindeki dağılımları görüntülenmiştir. Yapıştırma bağlantılarında kullanılacak olan karbon fiber levhalar ve Alüminyum 2024-T3 levhalar uygun ölçülerde kesilmiş ve yapıştırma işlemi için yüzeyleri uygun hale getirilmiştir. Yüzey hazırlama işlemlerinden sonra nanofiberler, karbon elyaf kompozit ve Alüminyum 2024-T3 yapıştırma numunelerinin yapıştırma bölgelerine ilave edilerek tek taraflı bindirmeli deney numuneleri ASTM D1002-10 standartına göre hazırlanmıştır. Üretilen deney numuneleri farklı sürelerde (1,7,14 ve 21 gün) saf su içerisinde bekletilmiş ve çekme testleri yapılmıştır. Elde edilen numuneler hiç suda şartlanmamış numunelerle kıyaslanmıştır. Kırılma yüzeyleri taramalı elektron mikroskobu (SEM) ile incelenerek naylon 6.6 nanofiberlerin ve grafen nano partikül (GNP) takviyeli nanofiberlerin yapıştırma bağlantıları üzerindeki etkileri, detaylı olarak açıklanmıştır.Doctoral Thesis Tuzlu Su Ortamınında Bazalt Elyum Kompozitlerin Düşük Hızlı Darbe Darvranışının Araştırılması(2026) Tatar, Ahmet Caner; Önal, GürolBu çalışmada; kompozit malzemelerde termoset reçinelere alternatif olarak geliştirilen Fransız Arkema Firmasının ilk kez 2015 yılında tanıttığı elium reçinesi ile hazırlanmış bazalt elyaf takviyeli kompozit malzemelerin mekanik özellikleri ve tuzlu suda şartlandırmanın bu kompozitler üzerine etkisi incelenmiştir. Öncelikle, el yatırma ve vakum infüzyon tekniği beraber kullanılarak, elium matrisli bazalt fiber takviyeli kompozit plakalar üretilmiştir. Daha sonra üretilen bu bazalt/elium kompozitler yapılacak olan mekanik testlere uygun ölçülerde kesilmiştir. Bir grup numune oda şartlarında test için bekletilirken diğer grup numuneler %3.5 tuz ihtiva eden tuzlu su içerisinde 1,2,4 ve 6 ay süreyle bekletilmiştir. Bu süre zarfında numunelerin ağırlıkları ölçülerek ne kadar su emdikleri tesit edilmiştir. Kompozitler eksenel çekme, 3 nokta eğme ve düşük hızlı darbe testlerine maruz bırakılmıştır. Sonuçlar tuzlu suda bekleyen kompozitlerin su emme oranlarıyla doğrudan bağlantılı olarak mekanik özelliklerinin azaldığını göstermiştir. Tuzlu suya maruz bırakılan kompozit numunelerin eksenel çekme dayanımı, zamana bağlı olarak azalmış ve bir ayda %18,27, iki ayda %24,09 oranında düşüş göstererek ilerleyen aylarda da benzer zayıflama eğilimini sürdürmüştür. Üç nokta eğilme deneyleri, bazalt elyaf kompozitlerin maksimum eğilme gerilmesinin tuzlu suda şartlandırma ile yaklaşık %45–49 oranında azaldığını ve bu düşüşün ilk aydan itibaren belirginleştiğini göstermiştir. Düşük hızlı darbe deneyleri, tuzlu suda şartlandırılmamış Elium/bazalt kompozitlerin en yüksek tepki kuvvetini verdiğini, tuzlu suda bekletme süresi arttıkça tepe kuvvetinin azaldığını ve bu azalmanın 4. aydan sonra yaklaşık sabitlendiğini göstermiştir. Numunelerin bekletildiği tuzlu suların FTIR grafikleri incelendiğinde kompozit matrisinin tuzlu su içerisinde çözündüğü tespit edilmiştir. Testleri gerçekleştirilen numunelerin hasar analizleri makro ve mikro düzeyde gerçekleştirilirken hasar bölgelerinden alınan elektron mikroskobu görüntülerinde tuzlu suda bekleyen numunelerin içerisine tuzlu suyun nüfuz ettiği gözlemlenen tuz kristalleri ile ispatlanmıştır. Tuzlu suyun fiber- matris arayüzeyini zayıflatarak kompozitlerin mekanik özelliklerinin azalmasına neden olduğu anlaşılmıştır. Sonuçlar elium matrisli kompozitlerin ve elium/bazalt kompozitlerin denizcilik sektöründe kullanılabilirliği konusundaki araştırmalara ışık tutmaktadır.
Research Topics
Domains
Physical Sciences
Fields
EngineeringMaterials Science
Subfields
Mechanics of MaterialsPolymers and PlasticsMechanical Engineering
Specific Research Areas
Mechanical Behavior of Composites
Tribology and Wear Analysis
Polymer Nanocomposites and Properties
Natural Fiber Reinforced Composites
Fiber-reinforced polymer composites
Similar Researcher Profiles
Sustainable Development Goals
7AFFORDABLE AND CLEAN ENERGY
1
Research Products
Documents
10
Citations
218
h-index
7
Documents
7
Citations
207
Publication Collaboration
| Affiliation Name | Count |
|---|---|
| Necmettin Erbakan University | 5 |
| Konya Technical University | 5 |
| Çanakkale Onsekiz Mart Üniversitesi | 2 |
| Selçuk University | 2 |
| Mersin Üniversitesi | 2 |
1 / 2
Data obtained from OpenAlex
| Journal | Count |
|---|---|
| Research on Engineering Structures and Materials | 2 |
| FIBERS AND POLYMERS | 1 |
| Journal of Composite Materials | 1 |
| COMPOSITE STRUCTURES | 1 |
| MECHANICS OF MATERIALS | 1 |
Current Page: 1 / 2
Scholarly Output
10
Articles
8
Views / Downloads
35/42
Supervised MSc Theses
1
Supervised PhD Theses
1
WoS Citation Count
116
Scopus Citation Count
135
Patents
0
Projects
0
WoS Citations per Publication
11.60
Scopus Citations per Publication
13.50
Open Access Source
3
Supervised Theses
2
Scopus Quartile Distribution
Competency Cloud
