Person: YAZICI, MURAT
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YAZICI
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MURAT
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Publication Impact behavior of natural rubber based syntactic foam core sandwich structures(Walter, 2021-11-01) Güçlü, Harun; Kasım, Hasan; Türkoğlu, I. Kürşad; Can, Yucel; Yazıcı, Murat; GÜÇLÜ, HARUN; YAZICI, MURAT; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Otomotiv Mühendisliği Bölümü; 0000-0002-5679-313X; 0000-0002-8720-7594; M-4741-2017; Q-8738-2018In this study, the impact behavior of sandwich panels of natural rubberbased syntactic foam cores with aluminum face sheets was investigated experimentally and with the help of finite element analysis (FEA). Syntactic foam cores were produced byadding glass bubbles (GB) to the natural rubber (NR). Natural rubber was dissolved at room temperature with chemical solvents mixed with glass bubbles at 10, 20, and 30 weight percentages. Very low density (similar to 0.8 g x cm(-3)) and high compressible foams were obtained depending on the GB weight percentages. Aluminum face sheets and the NR/GB syntactic foam core developed were joined by adhesive bonding to produce sandwich beam specimens. The sandwich beams manufactured in this way were subjected to impact loading under three-point bending boundary conditions experimentally. The experimental results were compared with finite element simulation results under the same loading and boundary conditions. The damage mechanism of the sandwich panels devised were analyzed. According to the results, natural rubber containing an additive of 20 wt.-% GBs showed better impact resistance than the others.Publication Development of MNO2/PANI/SWCNT nanocomposite supercapacitor electrode and investigation of electrochemical performance(Bursa Uludağ Üniversitesi, 2023-09-25) Özada, Çağatay; Ünal, Merve; ÖZER, HAKKI; YAZICI, MURATIn this study, a manganese dioxide (MnO₂/polyaniline (PANI)/ single-walled carbon nanotube (SWCNT) nanocomposite electrode was prepared for pseudo-supercapacitors. To reduce the internal resistance of the electrode, increase the capacitance stability, and reduce the cost of single-walled carbon nanotubes, SWCNT was subjected to two-step acid etching. The purity of SWCNT was improved from ~95% to 99.98%. In addition, SWCNT was functionalized by this process. Thus, a nanocomposite was formed by coating PANI around SWCNT. MnO₂/PANI/SWCNT were synthesized using the hydrothermal method. Morphological, chemical and thermal analyses of the synthesized nanocomposite structure were carried out. In addition, X-ray diffraction (XRD) was used to determine the crystal structure. Electrochemical analyses were performed using a three-electrode system in a 1 M KOH electrolyte solution. Cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) measurements were performed. The capacitance of the nanocomposite electrode at 400 cycles was314 mF/cm², and the capacitance retention stability was calculated at 73.24%. The results showed that the capacitance stability was high, and the supercapacitor was sensitive to redox reactions.Publication Electrical characterization of deformation behavior of carbon-based conductive filled nanocomposites under constant amplitude fatigue loading(Sage Publications, 2021-11) Kasim, Hasan; Yazıcı, Murat; YAZICI, MURAT; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Otomotiv Mühendisliği Bölümü; 0000-0002-8720-7594; M-4741-2017Elastomer-based nanocomposites(EcNs) were prepared with a novel mixing method to determine the deformation properties under constant amplitude dynamic operating conditions. The fillers of EcNs consists of functionalized(M-FCNTs) and nonfunctionalized carbon-nanotubes(M-NCNTs), graphite(GF) and carbon black(CB). In this study, six different mixtures were prepared using M-FCNT, and M-NCNT fillers in 1, 2, 3 phr ratios, except for a CB-filled reference mixture(C00). Graphite, which has exfoliation and excellent lubricating properties1, was added to six mixtures at the rate of 1 phr to prevent agglomeration of M-CNTs in the mixtures. SEM images show that M-CNTs are homogeneously distributed, interacting strongly with GF, and M-FCNTs have a better interface interaction than M-NCNTs. During crosslinking of M-NCNT filled EcNs, due to the resistance in the direction of the polymer chain's movement, the difference between minimum torque and maximum torque increased by approximately 10% compared to M-FCNTs. The lost energy (Delta W) between the loading and unloading curves of M-NCNT filled EcNs increased compared to the M-FCNT filled mixtures and C00. The resistance properties depending on the samples' strain value showed a more stable and repetitive behavior in M-FCNT filled EcNs with a ratio of 1 and 2 phr, called F-C01 and F-C02, respectively. The semiconductor F-C01 sample showed the most stable behavior due to preserving the conductive filler network's structural order during the fatigue test, although the average resistance change was highest with 1.51E + 07 omega. We discuss ways to use conductive elastomer composites as an effective deformation detection sensor in dynamic applications based on the results.Publication Finite element simulation of rotary shaft lip seals(Polish Acad Sciences Inst Physics, 2019-05-01) Engin, Buğra; Saraç, İsmail; Yazıcı, Murat; YAZICI, MURAT; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi.; 0000-0002-8720-7594; M-4741-2017Radial lip seals operate between stationary machine body and rotating shaft during relative motion under continuously contacting to provide the sealing mechanism. Therefore, the complete modeling of a radial lip seal is very complicated. In this study, a hyperelastic elastomer based radial shaft lip seal mechanical simulations were performed using nonlinear explicit finite element analysis. The finite element analysis results under complex boundary and nonlinear material behavior conditions were obtained and compared with the experimental and theoretical results. According to obtained results, the radial force between the shaft and lip seal of finite element analysis simulation results fully confirms the experimental measurements and the theoretical calculations. perfectly. the obtained differences were less than 1.5%.Publication Impact loading performance of polymer foam core aluminium sandwich panels(Polish Acad Sciences Inst Physics, 2019-04-01) Can, Yücel; Türkoğlu, I. K.; Güçlü, H.; GÜÇLÜ, HARUN; Kaşar, I.; Yazıcı, M.; YAZICI, MURAT; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Otomotiv Mühendisliği Anabilim Dalı.; 0000-0002-5679-313X; 0000-0002-8720-7594; Q-8738-2018; M-4741-2017In this study, two different foam core aluminum face sheets sandwich panels were developed. The core materials were selected as expanded polypropylene (EPP) and extruded polystyrene (XPS) foams. Two aluminum face sheets and foam cores were combined with flexible epoxy-based adhesives, under 20 N static compression load. The average density of the produced sandwich panels was 0.39 g/cm(3) for EPP foam core sandwich and 0.33 g/cm(3) for XPS foam core sandwich panel. Produced specimens were subjected 3-point bending experiments under impact loading. Damage behavior of the sandwiches was observed using post-mortem pictures. The results show that the produced sandwiches damaged perfectly plastic deformations with face sheets and core. There was not any adhesive and cohesive failure in the core and face sheets interfaces.Publication Investigation of the crack propagation behavior of the multiwalled carbon nanotube/graphite/natural rubber hybrid nanocomposites using digital image correlation technique(Amer Scientific Publishers, 2019-12-01) Can, Yücel; Kasım, Hasan; Aldeen, Ahmad Naser; Yazıcı, Murat; YAZICI, MURAT; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi; 0000-0002-3024-5207; 0000-0002-8720-7594; AAS-6413-2021; AAE-6361-2021; M-4741-2017In the presented study, a hybrid Natural Rubber (NR) based semiconductive nanocomposites was examined to obtain better electrical and mechanical properties. The hybrid nanocomposite produced by incorporation of the Multiwalled Carbon Nanotube (MWCNT) and graphite nanoparticles into the NR. The conventional curing additives also included in the compound. A functionalized MWCNT (1, 2 and 3 phr's) with 3 phr graphite quotas were studied to produce the NR nanocomposites. The MWCNT/Graphite and NR mixed homogeneously to advance the interfacial interaction with the matrix. The graphite nano-particulates added to obtain 3D electrical connectivity network in the hybrid nanocomposites by becoming bridging points between multiwalled carbon nanotubes. Nanocomposites were produced as 3 mm sheets in a steel mold by vulcanizing at 165 degrees C for 10 min under pressure. The single-edge notched tension specimens were subjected to estimate crack propagation and electrical resistance relation. Digital Image Correlation (DIC) technique was used to observe the crack resistivity function. The results evaluated to clarify the relationship between crack length, MWCNT filler ratio, and electrical conductivity properties. MWCNTs are generally preferred as the reinforcements for their very high aspect ratio and excellent specific surface area properties. However, the electrical conductivity of the nanocomposites is owing to the constitution of a continuous conductive 3D network of MWCNT and Graphite in the NR matrix.Publication Experimental investigation of 3d-printed auxetic core sandwich structures under quasi-static and dynamic compression and bending loads(Sage Publications Ltd, 2022-03-27) Türkoğlu, I. Kurşad; Kasım, Hasan; Yazıcı, Murat; YAZICI, MURAT; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Otomotiv Mühendisliği Anabilim Dalı.; 0000-0002-3024-5207; 0000-0002-8720-7594; M-4741-2017Auxiliary metamaterials designed according to the Negative Poisson's Ratio (NPR) property are exciting structures due to their high impact strength, impact energy absorption abilities, and different damage mechanisms. These good mechanical features are suitable for aviation, automotive, and protective construction applications. These structures, whose most significant disadvantages are production difficulties, have become easier to produce with the development of 3D production technology and have been the subject of many studies in recent years. In this presented study, two conventional core geometries and three different auxetic geometries, commonly used in sandwich structures, were designed and produced with 3D printer technology. The strength and energy absorption capabilities of prototype sandwich structures investigated experimentally under bending loads with static and dynamic compression. Except for the re-entrant (RE) type core, the auxetic core foam sandwich structures demonstrate higher rigidity and load-carrying capacity than classical sinusoidal corrugated (SC) core and honeycomb (HC) core sandwich structures under both quasistatic and impact-loaded compression and three-point bending experiments. Double arrowhead (DAH) and tetrachiral (TC) auxetic cores outperformed honeycomb core in terms of specific quasistatic and impact load-bearing performance under compression by 1.5 +/- 0.25 times. In three-point bending experiments under both quasi-static and impact loading conditions, the load-carrying capacity of the double arrowhead and tetrachiral auxetic cores was found to be more than 1,86 +/- 0.38 times that of the honeycomb core sandwich panels.Publication A modular training project for vocational education and improvement in Turkey(Sage Publications Ltd, 2009-04-01) ARSLAN, RİDVAN; TEKİN, YÜCEL; Yazıcı, Murat; YAZICI, MURAT; Kuş, Abdil; KUŞ, ABDİL; Kaynak, Z. Gökay; Bursa Uludağ Üniversitesi/Ziraat Fakültesi; Bursa Uludağ Üniversitesi/Fen Edebiyat Fakültesi; 0000-0002-0111-6879; 0000-0002-8720-7594; J-3560-2012; M-4741-2017; V-1754-2018; AAG-9412-2021Various vocational training methods, most of which overlap with lifelong learning programmes, are being used to address the problem of unemployment - an issue of vital importance, especially for developing countries. This article examines the introduction of a modular certification project in Turkey supported by EU training funds. The objective of the project is to enable people who are unemployed to find work and people in employment to improve their professional skills and competences, and therefore their opportunities. The researchers observed the employment status and development of the 245 people who received a certificate. They found that 89% either had found work in a sector consistent with their training, thanks to their participation in the project, or had to taken up a different position in their current field of employment.Publication An easy-to-implement self-healing smart design for increasing impact strength and crashworthiness resistance of honeycomb sandwich structures(Sage Publications Ltd, 2022-09-13) GÜÇLÜ, HARUN; Güçlü, Harun; Osmanoğlu, Serhat; Hayırkuş, Aslıhan; Taş, Oğuzhan; Yazıcı, Murat; YAZICI, MURAT; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Otomotiv Mühendisliği Bölümü.; 0000-0002-5679-313X; 0000-0002-8720-7594; Q-8738-2018; M-4741-2017In this paper, the dynamic compression impact response of an aluminum honeycomb core filled with open-cell foams impregnated with self-healing liquid agents was investigated experimentally. Samples were subjected to a variety of impacts in order to determine healing time and self-healing performance. Three different sandwich specimens were developed to evaluate the effectiveness of self-healing. The sandwich specimens are designated as B (empty honeycomb core cells), S (only open-cell soft polyurethane foam-filled honeycomb core cells), and self-healing agent (SHA) (open-cell soft polyurethane foams impregnated with liquid self-healing agents). The test results were presented by considering the crashworthiness and healing efficiency criteria, and the impact characteristics of the samples were compared related to these criteria. After testing, the results demonstrated that the self-healing agent specimens had much fewer buckling deformation and displacement than their counterparts. Significant improvements were achieved in healing efficiencies and crashworthiness evaluation criteria. The peak load and the energy needed to attain peak load are considered healing efficiency criteria. Self-healing agent specimens reached 29.7% and 12.9% more peak loads, and in the energy absorbed up to peak loads 140% and 34.9% higher values than the B and S sandwiches. In the same samples, crushing strain features were acquired as 50% versus 66%, indicating less displacement in self-healing agent specimens than counterparts. The results indicated that an aluminum honeycomb sandwich structure that can heal itself after damage and recover impact characteristics remarkably could be produced practically.Publication A sandwich panel that autonomously repairs sudden large holes and defects for tankers and pipelines carrying hazardous matter(Sage Publications Ltd, 2022-04-12) Özer, Hakkı; Kuzu, Eslem; Özada, Çağatay; Ünal, Merve; Kasım, Hasan; Yazıcı, Murat; ÖZER, HAKKI; Kuzu, Eslem; Özada, Çağatay; Ünal, Merve; YAZICI, MURAT; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Otomotiv Mühendisliği Bölümü.; 0000-0003-1503-1232; 0000-0002-8720-7594; AAC-5342-2021; M-4741-2017; AAG-9987-2021; FOL-7608-2022; FFS-9528-2022; AAG-9987-2021The self-healing of micro and macro cracks is vital for eliminating defects such as damage progression and loss of strength in structures. In this study, a polyurethane (PU) based geometrically self-healing sandwich structure was developed. The geometric healing agent, PU resin and activator, were filled into macrocapsules, and these capsules were filled into the Aluminum (Al) honeycomb cells. Self-healing of structural strength, large holes and cracks in developed sandwich structures were investigated by performing quasi-static compression and impact penetration tests. The sandwich structure with a self-healing capsules-filled core was damaged by subjecting it to quasi-static and penetration impact loads, and the healing agents in the broken capsules were mixed. The damage in the specimen was removed by geometric self-healing. Liquid and air permeability tests were applied to the PU foam used as a healing agent. No liquid permeability was observed in the structure. In addition, significant reductions in air permeability were obtained. Scanning electron microscope images were used to explore the characterization of the PU foam structure cells.