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Öğe Ballistic impact response of hybrid composite plates(Hibetullah KILIÇ, 2024) Örçen, Gurbet; Ateş, FerhatThe behaviors exhibited by materials used in military and civilian daily applications in response to ballistic impacts constitute an important field of study. These behaviors have been investigated experimentally on composite plates with different configurations. For this purpose, Para-Aramid (Kevlar)/epoxy and Para-Aramid (Kevlar)/Glass hybrid composite plates with two different configurations were produced. Specimens obtained from these plates were subjected to tests at velocities corresponding to armor levels IIIA, IIA, and II. As a result of the tests, the effects of the velocities on the target specimens were compared. At the same time, the deformations on the plates were also examined. The study, conducted at three different velocities, yielded positive results from the Para-Aramid (Kevlar)/epoxy composite in the level IIA test, while negative results were obtained from the two hybrid plates. In the levels II and IIIA velocity tests, deformations were observed in the composite plates. Matrix cracks and fiber breakages were detected in the deformations obtained.Öğe Bindirme bağlantılı kompozitlerin hasar davranışları üzerinde sıcak suyun etkisi(Dicle Üniversitesi Mühendislik Fakültesi, 2018) Örçen, GurbetBu çalışmada örgülü cam fiber takviyeli epoksi kompozitlerin hasar davranışları üzerinde sıcak suyun etkisi deneysel olarak araştırılmıştır. Tek ve çift tesirli bindirme bağlantısı yapılmış kompozit numuneler, oda sıcaklığındaki musluk suyu ile 50 0C sıcaklıktaki musluk suyunun içerisinde 7 gün ve 21 gün süre ile bekletilmiştir. Bekleme süresi sonunda numunelerin nem emilim oranları, maksimum hasar yük değerleri ve hasar tipleri tespit edilerek, kendi içinde karşılaştırılması yapılmıştır. Yapılan çalışmada, suda bekleme zamanı ve suyun sıcaklık derecesi arttığı zaman numunelerin nem emilim oranlarının arttığı ancak maksimum hasar yük değerlerinin düştüğü tespit edilmiştir. Ayrıca çift tesirli bindirme bağlantılı numunelerden elde edilen nem emilim miktarlarının ve maksimum hasar yük değerlerinin daha yüksek olduğu deneysel olarak elde edilmiştir. Oda sıcaklığındaki musluk suyunda 7 gün boyunca bekletilen çift tesirli bindirme bağlantılı numunelerin nem emilim miktarlarının, aynı sürede, aynı şartlarda bekletilen tek tesirli bindirme bağlantılı numunelerin nem emilim miktarlarına göre %251.6 oranında artış sağladığı ölçülmüştür. Bunun yanında tek tesirli bindirme bağlantılı numunelerin 50 0C sıcaklıktaki musluk suyunun içerisinde 21 gün bekletildikten sonra elde edilen maksimum hasar yük değerlerinin aynı şartlarda ve sürede bekletilen çift tesirli bindirme bağlantılı numunelerden elde edilen maksimum hasar yük değerlerine göre %104.05 oranında düşük olduğu tespit edilmiştir. Ayrıca bekleme süresi sonunda numunelerden elde edilen hasar tiplerinin genellikle kuru numunelerden elde edilen hasar tipleriyle benzer olduğu görülmüştür.Öğe Direct comparison of low velocity impact performance of nanoclay, boric acid and interlayer hybrid composites(Wiley, 2024) Örçen, Gurbet; Ünal, Hasan Yavuz; Pekbey, YelizIn this study, the low velocity impact effect of glass fiber-reinforced laminated composites reinforced with nanoclay and boric acid was investigated. Nanoclay, boric acid, and interlayer hybrid composites were produced at 0 (pure), 0.5, 1, and 1.5 wt% with respect to epoxy resin. Laminated composites were obtained by the hand lay-up method. Impact tests were applied to the specimens by releasing the weight. Tests were carried out with impact energies of 30, 40, 50, and 60 J to evaluate the behavior of composites under loading result in rebounding. Nano reinforcement generally increases the maximum reaction force while decreasing the impact duration, maximum displacement, and absorbed energy. As a result of all the tests performed, the reaction force increased up to 53% compared to the pure specimen, while the absorbed energy, impact duration, and maximum displacement values decreased up to 21%, 36%, and 12%, respectively. The results of the hybrid specimens in the interlayer sequence provided more changes compared to the mono-reinforced specimens (i.e., nanoclay or boric acid). The hybrid specimen with a reinforcement ratio of 1.5 wt% impact face boric acid exhibited the greatest enhancement in impact resistance among all the tested specimens. The reaction force, which is an indicator of resistance, increased by 44%, 35%, 51% and 34% from energy level 30 to 60 J, respectively. Furthermore, the specimen exhibited the lowest values for absorbed energy, maximum displacement and impact duration.Öğe The effect of hot water ageing on the glass fiber reinforced epoxy composite(INESEG Yayıncılık, 2019) Örçen, GurbetIn the present study, the effects of hot water ageing on the glass fiberreinforced epoxy woven composites were experimentally examined. Thespecimens in three groups which undamaged, damaged, and single patchrepaired ones were kept in tap water at 50°C and 70°C temperature for 8days and 16 days. At the end of those periods, the moisture absorption rateswere calculated, the maximum failure loads at the end of period of keepingin hot water were determined and the failure modes occurring on thesespecimens were observed and compared. As a result of experimental study, itwas found that the moisture absorption rates increased but the failure loadvalues decreased together with the increase in water temperature andduration of hot water ageing.Öğe Effect of Humidity and Temperature on Composite Plates With Different Fiber Orientations(2021) Çiftçi, Taha Emre; Örçen, Gurbet; Koyun, EnginIn this study, the effect of humidity and temperature on glass fiber reinforced epoxy composite plates with different fiber reinforcement angles and different widths were experimentally investigated. For this purpose, composite plates with fiber reinforcement angles of [0°]8 and [45°/-45°/0°/90°]s were prepared in 25 mm and 30 mm dimensions and kept in hot water at 40 °C, 60 °C and 80 °C for 15, 30 and 45 days. At the end of the duration, the moisture absorption rates and strengths of the specimens were obtained. The obtained data were compared among themselves and with that of dry specimens. In addition, the morphologies of the specimens were visualized with the help of Scanning Electron Microscope (SEM) and the effects of humidity and temperature on failure behavior were examined. It was determined that the strength of the [45°/-45°/0°/90°]s fiber orientations specimens was lower than the strength values obtained from the [0°]8 fiber orientations specimens. It has been determined that when the waiting time and temperature increase, the matrix/fiber structure of the specimens deteriorates and the strength values decrease accordingly.Öğe Effect of nanoclay on the mechanical and thermal properties of glass fiber-reinforced epoxy composites(Springer, 2024) Örçen, Gurbet; Bayram, DuyguThe efects of nanoclay (NC) addition on the thermal and mechanical properties of glass fber-reinforced epoxy composites were investigated experimentally in this study. Nanocomposite plates were produced for this purpose using three diferent NC ratios (0.5%, 1%, and 1.5% by weight). Thermal characteristics of nanocomposites were investigated using dynamic mechanical analysis, diferential scanning calorimetry, and thermogravimetric analysis. The mechanical and thermal results obtained from composites with three diferent NC ratios were compared with the results obtained from pure composites. The structures of nanocomposites were investigated with the help of SEM–EDS analyses. Furthermore, the efect of nanoclay on the failure behavior of composites was also investigated. In this study, the highest values in all mechanical properties were obtained from samples with a 1% NC-added. Obtained from 1% NC-added samples: tensile, compressive, shear strengths, elasticity modulus, shear modulus, and Poisson’s ratio values were 31.06%, 4.25%, 14.30%, 7.35%, 11.94%, and 12.5% higher, respectively, than the values obtained from pure samples. Maximum loss modulus and maximum storage modulus were obtained from samples with 1.5% and 0.5% NC-added, respectively. In samples with 1.5% NC-added, the highest Tan δ value was obtained. Glass transition temperatures increased with the added NC. It was observed that the fber–matrix interfaces were more clearly separated in the samples with 1.5% NC-added.Öğe Elasto-plastic stress analysis in laminated thermoplastic composite plates with an elliptic hole(Association for Scientific Research, 2013) Örçen, Gurbet; Gür, MustafaIn this paper, elasto-plastic stress analysis in laminated thermoplastic composite plates having an elliptic hole in the middle is examined by using finite element method. Composite plates consist of four orthotropic laminations and bonded symmetrically [θ0/-θ0]. Uniform loadings in vertical direction are applied to the selected composite plates. The loading and reinforcement angle are gradually increased from the yield point of the plate. The load steps increased as 0.0001 MPa at each iteration. Iteration numbers are chosen 25, 50, 75 and 100. A quarter of the plate is taken into consideration due to symmetry. Elasto-plastic stresses are obtained according to load steps and orientation angles.Öğe ELASTO-PLASTIC STRESS ANALYSIS IN LAMINATED THERMOPLASTIC COMPOSITE PLATES WITH AN ELLIPTIC HOLE(2013) Örçen, Gurbet; Gür, MustafaIn this paper, elasto-plastic stress analysis in laminated thermoplastic composite plates having an elliptic hole in the middle is examined by using finite element method. Composite plates consist of four orthotropic laminations and bonded symmetrically [?0/-?0]. Uniform loadings in vertical direction are applied to the selected composite plates. The loading and reinforcement angle are gradually increased from the yield point of the plate. The load steps increased as 0.0001 MPa at each iteration. Iteration numbers are chosen 25, 50, 75 and 100. A quarter of the plate is taken into consideration due to symmetry. Elasto-plastic stresses are obtained according to load steps and orientation angles.Öğe Eliptik delikli termoplastik tabakalı kompozit levhalarda plastik gerilme analizi(2009) Gür, Mustafa; Örçen, Gurbet; Solmaz, M. YavuzBu çalışmada, ortasında eliptik delik bulunan termoplastik (Polyvinyl Chloride) tabakalı kompozit levhalarda plastik bölgelerin yayılışı ve gerilme analizi yapılmıştır. Dokuma şeklinde çelik fiber takviyeli kompozit levhalar $[teta^0/-teta^0]_2$ simetrik olarak birleştirilmiş dört ortotropik tabakadan meydana gelmiştir. Levhalara düşey doğrultuda üniform yükleme yapılmıştır. Yükleme, seçilen her takviye açısı için levhanın akma noktasından başlayarak 0.0001 MPa’lık artışlarla 25, 50, 75 ve 100 iterasyonda gerçekleşmiştir. Yükleme adımlarına ve farklı takviye açılarına göre, kompozit plakta meydana gelen plastik gerilmelerin değerleri sonlu elemanlar metoduyla elde edilmiştir. Kompozit plakta plastik bölgeler alt ve üst yüzeylerde meydana gelmiş, ara yüzeylerde oluşmamıştır. Ara tabakalardaki gerilme bileşenlerinin alt ve üst yüzeylerdekilerden daha düşük değerlerde olduğu görülmüştür. İterasyon sayısına bağlı olarak plastik gerilme bileşenlerinde artış gözlenmiştir.Öğe Mechanical properties of composite plates at different conditions(INESEG Yayıncılık, 2020) Örçen, Gurbet; Turan, Kadir; Bingöl, SedatIn this study; the effects of thermal aging on the mechanical properties of composite materials were investigated. In study, eight layered woven glass fiber reinforced epoxy composite plates were used. Thermal aging was performed in an electric furnace using time and temperature change parameters. The time changes were 1, 3 and 5 hours, and 50 0C, 100 0C, and 150 0C were used for temperature changes. Thermally aged composite plates, at specified time and temperature values; modulus of elasticity, poisson ratio, tensile strength, compression strength, shear modulus and shear strength were determined in fiber reinforcement direction. The results obtained were compared with the results obtained from the specimens waited at room temperature. At the end of the study, it was determined that the mechanical properties of the composite plates changed when the thermal aging temperature and temperature increased.
