Yazar "Feyzullahoglu, Erol" seçeneğine göre listele
Listeleniyor 1 - 4 / 4
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe Estimation of adhesive wear behavior of the glass fiber reinforced polyester composite materials using ANFIS model(SAGE Publications Ltd, 2021) Yilmaz, Serhat; İlhan, Recep; Feyzullahoglu, ErolGlass fiber reinforced polyester (GFRP) composite materials are widely used in various applications. The prediction of wear values for composite materials is very complex and nonlinear phenomena. Artificial intelligence methods (AI) and expert systems such as artificial neural networks (ANNs) and fuzzy inference systems (FIS) have a series of properties on modeling nonlinear systems. In some situations, ANNs are insufficient under abrupt changes in input variables. Adaptive Neuro Fuzzy Inference System (ANFIS) is capable of integrating the linguistic expressions of FIS with the adaptation and learning skills of the ANNs. The aim of this study is to determine the optimum material content and working conditions in terms of wear resistance. This study proposes an ANFIS sub-clustering based prediction model for estimation of wear behavior of GFRP composites within various concentrations of materials and under diverse loads and speeds. Proposed ANFIS model extracted optimum concentrations and operating parameters to obtain the minimum wear rate. Due to the wear rate estimation model, optimum wear rate value is reached to 25.0013 (mm(3)/Nm)*10(-6) at CaCO3, polystyrene, glass fiber, glass bead, alumina, load and speed values of 49%, 0%, 11%, 10%, 0.8%, 10 N and 100 rpm respectively. A high estimation capability (R-2 = 0.964) has been achieved using ANFIS Model.Öğe Farklı Türlerde Polyester ve Çekme Katkısı İçeren Cam Elyaf Takviyeli Polyester Kompozit Malzemelerde Çevresel Koşulların Aşınma Davranışlarına Olan Etkilerinin İncelenmesi(2024) Korku, Mihriban; Feyzullahoglu, Erol; İlhan, RecepKompozit malzemeler, gelişen teknoloji ile birlikte günümüzde birçok alanda başarıyla kullanılmaktadırlar. Elyaf takviyeli polimer kompozitler, yüksek dayanım ve düşük maliyet özelliklerinden dolayı en sık tercih edilen kompozit malzemelerdir. Cam elyaf takviyeli polyester (CTP) kompozitler kullanım alanlarına göre istenilen mekanik ve tribolojik özellikleri karşılayan polimer matrisli ve cam elyaf takviye malzemeli bir kompozit türüdür. Cam elyaf takviyeli polyester kompozit malzemeler farklı türlerde polyester ve çekme katkıları içerebilmektedir. Çevresel koşullar cam elyaf takviyeli polyester kompozitlerin aşınma dayanımı üzerinde etkili olmaktadır. Bu çalışmada, iki farklı türde polyester (ortoftalik ve izoftalik) ve çekme katkısı (polistiren ve plastifiyen) içeren cam elyaf takviyeli polyester kompozit malzemelerin farklı çevresel koşullar (UV ışıma, asit ortamı, tuzlu su ortamı, hızlandırılmış yaşlandırma, hidrotermal yaşlandırma ve termal çevrim) altındaki aşınma davranışları incelenmiş ve farklı türlerde polyester ve çekme katkısı içeren numunelerde çevresel koşulların malzemelerin aşınma davranışları üzerine olan etkileri araştırılmıştır. CTP kompozit numunelerin aşınma dayanımına çevresel koşulların etkileri dikkate alındığında her iki numunede de UV ışıma ortamına ve hidrotermal yaşlandırmaya maruz kalan numunelerin aşınma dayanımının arttığı gözlemlenmiştir. CTP kompozit malzemelerin içerisinde polistiren çekme katkısının kullanılması malzemenin aşınma dayanımını iyileştirmektedir. Ortoftalik polyester reçine içeren CTP kompozit numunelerin, izoftalik reçine içeren numunelere kıyasla aşınma dayanımları daha iyidir.Öğe Investigation of adhesive wear properties of glass fiber reinforced polyester composites having different chemical compositions(SAGE Publications Ltd, 2021) İlhan, Recep; Feyzullahoglu, ErolGlass fiber reinforced polyester composite materials are widely used in various areas due to their high specific strength, low weight, excellent elasticity, high corrosion resistance, and high thermal stability. This study aims to investigate the effects of resin materials and various fillers and wear parameters such as different loads and speeds on the tribological properties of glass fiber reinforced polyester composite materials. In this experimental study, various resins (tensile additive orthophthalic polyester and plain orthophthalic polyester), fillers (alumina and glass beads), and reinforcing materials were used during the sample preparation. The samples were subjected to an adhesive wear test at two different speeds (n = 100 r/min and n = 200 r/min) and different loads (F = 10 N and F = 20 N) at 150 m sliding distance. The friction coefficient and friction force were measured by the tribometer. The thickness of the wear trace was later measured and the wear rate was calculated. Wear surfaces of samples were visualized with a three-dimensional laser profilometer in order to obtain surface topographies and surface roughness values. The sample surfaces were examined by scanning electron microscopy in order to understand the wear mechanisms and to characterize the morphology of worn surfaces. Experimental results have shown that alumina or glass beads fillers can reduce the average friction coefficient when used in the correct amounts. The use of glass bead filler in orthophthalic polyester resin with tensile additive is more effective than reducing the wear rate compared to alumina filler. The load on the wear behavior of glass fiber reinforced polyester composite materials is more effective than the speed.Öğe Investigation of effects of environmental conditions on wear behaviors of glass fiber reinforced polyester composite materials(Wiley, 2025) Korku, Mihriban; Ilhan, Recep; Feyzullahoglu, ErolGlass fiber reinforced polymer (GFRP) composites can be subjected to different environmental conditions such as temperature, humidity, ultraviolet radiation, hydrothermal cycle, acidic and alkaline solution in environments where they operate. These environmental conditions cause different damage mechanisms in composites such as pore formation, micro-cracks, delamination, fiber breakage, fiber/matrix interface separation, plasticization, swelling and surface color change. In this study, wear properties of hybrid glass fiber reinforced polymer composites exposed to various environmental conditions for constant load (60 N), speed (500 rpm) and 2 h were examined comprehensively, depending on material content and environmental conditions. In this experimental study, the service conditions in glass fiber reinforced composites were simulated using different artificial aging environments such as acidic environment, hydrothermal cycle and UV radiation. In addition to the material content, it appears that the environmental conditions to which composites are exposed has a significant effect on friction coefficient. Considering environmental conditions, it is seen that the acid environment and hydrothermal cycle have reduced wear resistance of GFRP composites, while UV radiation improved wear resistance of the composites. In C2 sample, the wear rates under different conditions are 1.87 x 10-14 m3/Nm in non-treated sample, 6.05 x 10-14 m3/Nm in acid environment, 4.79 x 10-14 m3/Nm in hydrothermal cycle and 0.59 x 10-14 m3/Nm in UV radiation.Highlights Friction coefficient of glass fiber reinforced polyester (GFRP) is higher under aged condition compared to non-treated. Glass fibers used in correct proportions can reduce friction coefficient in GFRP. GFRP exposed to environmental conditions has an important effect on wear. Acid environment and hydrothermal cycle has reduced wear resistance of GFRP. UV radiation improved wear resistance of GFRP composite. Glass fiber reinforced polymer composites subjected to different environmental conditions. image
