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Öğe Effect of graphene nanoplatelet filling on mechanical properties of natural fiber reinforced polymer composites(Walter De Gruyter Gmbh, 2021) Erdogdu, Yusuf Eren; Korkmaz, Engin Eren; Temiz, SemsettinIn this study, the mechanical properties of plain woven jute-epoxy composite materials were investigated after filling graphene nanoplatelets (GNPs) in different proportions. The time dependent changes in the viscosity and temperature of unfilled epoxy resin, with 0.5, 1 and 2 wt.-% graphene nanoplatelets filled epoxy resins were observed. Woven jute reinforced unfilled, 0.5 wt.-% GNPs filled and 1 wt.-% GNPs filled epoxy composite plates were produced by using vacuum assisted resin transfer molding (VARTM) at the same waiting and processing times. Specimens were prepared and subjected to tensile and flexural tests according to ASTM D 3039 and ASTM D 790 standards, respectively. Images were taken and evaluated with a scanning electron microscope (SEM) in areas where tensile damage occurred. It was observed that the gap amount between the fiber and the matrix increased and the interface adhesion decreased as the fill amount increased in the composites produced. The testing results indicated that the tensile and flexural properties of composites decreased at 0.5 wt.-% and 1 wt.-% during the GNPs loading as compared to unfilled composites.Öğe Microstructure and mechanical properties of a semi-centrifugal compression processed Al6013 and Cu bimetal(Walter De Gruyter Gmbh, 2021) Avci, Ugur; Erdogdu, Yusuf ErenIn this study, aluminum Al6013 and copper (Cu) cylindrical bimetal was manufactured by means of an original production method. The optical microscope and scanning electron microscope (SEM) images of the bimetal material produced through this approach, semi-centrifugal compression, were used in microstructural investigations following which metallurgical transition zones were defined. Through an energy dispersive X-ray (EDX) analysis of the defined regions, the chemical content of the regions were determined. Micro hardness values of the regions were determined and comparisons were made with the chemical content and hardness values of the materials used in the bimetal production before the manufacturing process. In addition, the mechanical properties of the materials were compared by applying tensile tests to the bimetallic components Cu and Al6013 and to the bimetal material produced. In the light of the values obtained, the general properties of the bimetal material produced through this new approach were presented.Öğe Tribological Behaviors of Natural Fiber Reinforced Nanofilled Polyurea Matrix Composites at High Temperatures(Taylor & Francis Inc, 2023) Erdogdu, Yusuf Eren; Temiz, SemsettinThe properties of natural fibers such as poor ultraviolet (UV) resistance and hydrophilicity that reduce the durability of composites limit their usage as reinforcements in polymer matrix composites. To compensate this, new types of composites are proposed in the present study. The tribological behaviors of multiphase composites with polyaspartic polyurea matrix produced by vacuum assisted resin transfer molding (VARTM) technique with jute reinforced, filled by graphene nanoplatelets (GNPs) and titanium dioxide (TiO2) nano-fillers at high temperatures are investigated. The wear tests were performed under 10, 20, and 30 N loads, at 60% humidity and temperatures of 100 degrees C, 125 degrees C, and 150 degrees C using a heat moduled pin-on-disc tribotester with an AISI 4140 counter-surface disc having an average surface roughness value of 1.033 mu m. The tests were carried out under dry friction conditions along 6000 m sliding distance at a sliding speed of 2 m/s. The results show that the wear damage types changed according to the nano-filler type. Wear loss and specific wear rate increased with increasing temperature and load in almost all types of composites. Using nano-filler caused irregularities in the change of the friction coefficient.