Tribological Behaviors of Natural Fiber Reinforced Nanofilled Polyurea Matrix Composites at High Temperatures

The 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°C, 125°C, and 150°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 µm. 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

VAKUM İNFÜZYON YÖNTEMİ İLE ÜRETİLEN KAYISI ÇEKİRDEĞİ KABUĞU TOZU KATKILI TABAKALI KOMPOZİTLERİN KIYASLANMASI

DergiPark: 571471klujesVakum infüzyon yöntemi, son yıllarda endüstride uygulanan üretim yöntemiolmanın yanında, uçak parçalarının onarımında, özel olarak tasarlanan tabakalıkompozit malzemelerin ve hibrit tabakalı kompozit malzemelerin üretimindekullanılan kompozit malzeme üretim yöntemidir. Bu çalışmada, vakum infüzyonmetodu ile üretilen farklı kürleşme sıcaklıklarında üretilen sade ve kayısıçekirdeği kabuğu tozu katkılı tabakalı kompozitlerin üretimi yapılmıştır.Ayrıca çalışmada, tarımsal atıkların kompozit malzemelerle olan ilişkileriincelenmiştir. Farklı kürleşmesıcaklıklarında elyaf ağırlığının farklı yüzde değerlerinde uygulanaraküretilen kayısı çekirdeği kabuğu tozu katkılı numunelerin çekme deneyine tabitutularak farklı kürleşme sıcaklıklarındaki sade numunelere göre dayanımkayıpları incelenmişti

A research on the fatigue strength of the single-lap joint joints bonded with nanoparticle-reinforced adhesive

Saraç, İsmail ( Aksaray, Yazar )Nano-technological developments, which have made significant progress in recent years, have significant impact on the science of adhesives. Therefore, in our study, the static and fatigue strengths of single-lap joints (SLJs) incorporating nanoparticles were compared to those without nanoparticles. Steel plates were used in the adhesive joints. The results revealed that average damage load increased significantly in nanoparticle-reinforced adhesive joints. The highest damage load was obtained with 4 wt% nano-Al2O3 in epoxy adhesive. As the average damage load increased, the locus of damage changed from interfacial to the mixture of interfacial and cohesive. Also, fatigue strengths of the joints increased when the adhesive joint had nano-Al2O3 and nano-SiO2, and decreased when the adhesive joint had nano-TiO2

Investigation of the effect of use of Nano-Al2O3, Nano-TiO2 and Nano-SiO2 powders on strength of single lap joints bonded with epoxy adhesive

WOS: 000467349000044In this study, single lap joints were formed by adding nano-Al2O3, nano-TiO2 and nano-Al2O3 powders in various proportions to the epoxy adhesive and using the additive-free epoxy adhesive; and also the mechanical properties of the connections were experimentally investigated at 20, 25, 30, 50 and 70 mm overlap lengths under shear load. In the experimental work, DP460 epoxy adhesive was used as adhesive and AISI 304 stainless steel plate as adherent material. When the results obtained from the experiments were examined, it was revealed that the average damage load in connection with the use of nanoparticle-added adhesives increased considerably in general. As a result of the experiments, the most effective nanoparticle in increasing the failure strength of the adhesive joints with nano-Al2O3 particles and the maximum failure strength increase rate was 20 mm in overlap length and 97% in 4 wt% nano-Al2O3 reinforced specimens. It was also found that the nanoparticle strain was an important parameter in the tensile strength of the adhesive joints. In addition, it has been found that the addition of nanoparticles into the adhesive increases the elongation of the joints. When the adhesion surfaces of the samples were examined as in the case of plain adhesives, damage was observed as adhesion separation while nanoparticle reinforcement was observed as a mixture of adhesion and cohesion.Batman University Scientific Research Projects (BAP) [BTUBAP-2016-PhD-2]We are grateful to Batman University Scientific Research Projects (BAP) Coordinator for providing financial support for the realization of our work (Project number: BTUBAP-2016-PhD-2)