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1
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Three-Dimensional Finite Element Analysis of Mixed Adhesive Bonded Joints under In-Plane Shear Loading

100%
Uysal M.
Acta Physica Polonica A
|
2016
|
vol. 129
|
issue 4
448-450
EN
The main objective of this work is to evaluate the buckling capacity of a mixed adhesively lab joint panel when subjected to in-plane shear loading. In the plate joints, two types of adhesive were used in the overlap region and the stiff adhesive was located in the middle. This technique proposes to modify the mechanical properties of adhesive along the overlap. The adherents used in the investigation are made up from homogeneous isotropic material and laminated composite. Three-dimensional finite element models were developed for mixed adhesively bonded isotropic and orthotropic panel pairs. Linear finite element models have been developed to understand how variable modulus bond line affected the buckling loads. Finite element analyses were performed to predict buckling loads for different adhesive Young's modulus ratios and different adherent material types in the first five modes.
2
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Joint Strength Optimization of Bi-Adhesively Bonded Composite-Aluminum Sandwich Structure

100%
Uysal M.
Acta Physica Polonica A
|
2016
|
vol. 129
|
issue 4
445-447
EN
Adhesively bonded joint strength optimization can be obtained through the modification of the overlap length and bi-adhesively bonded technique. In this technique, the joints have two different types of adhesive in the overlap length. In the present paper, the effects of bi-adhesively bondline on the shear stress, peeling stress and von-Mises stress of tongue and groove joints were investigated by using finite element analysis. The joint models were consisted of thick woven E-glass/vinyl ester laminate composite groove geometry together with aluminum 5083 tongue geometry. Finite element analyses were performed for three different tongue lengths (75, 150, 225 mm). The distribution of shear and peeling stresses were investigated on adhesively bonded tongue and groove joints subjected to longitudinal tensile loads. The results indicated that the joint strength can be improved by selecting appropriate design parameter values with bi-adhesive bonded technique.
3
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Buckling Behaviour of Short Cylindrical Functionally Gradient Polymeric Materials

64%
Uysal M., Kremzer M.
Acta Physica Polonica A
|
2015
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vol. 127
|
issue 4
1355-1357
EN
In the present study, the buckling behavior of short cylindrical Functionally Gradient Polymeric Materials (FGPMs) was studied. Besides, the structure and graphite distributions of the FGPMs were investigated. Epoxy resin was used as polymeric matrix component and two types of graphite powder materials, PAM96/98 and PV60/65, were selected. Graphite powders were added in quantities of 3, 6, 9, and 12% of volume respectively. Short cylindrical FGPMs samples were manufactured by centrifugal casting method. The structure and graphite distribution of FGPMs samples were investigated by light microscope and image processing program. It was observed that the graphite distribution had varied between the inner and outer diameter. The buckling behavior of short cylindrical FGPMs was analyzed by finite element analysis. The buckling loads of FGPMs samples were predicted.
4
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Reciprocating Wear Behavior of Ni-Co Alloys Produced by Pulse Current Electrodeposition

51%
Karslioğlu R., Uysal M., Alp A., Akbulut H.
Acta Physica Polonica A
|
2013
|
vol. 123
|
issue 2
424-426
EN
In the present work, Ni-Co alloy coatings were prepared from a modified Watt type electrolyte by direct current. For this purpose, current density was investigated for optimization to obtain high quality coatings on the steel copper substrates. The depositions were controlled to obtain specific thickness (between 50 and 200 μm). The characterization of the coatings was investigated by scanning electron microscopy and X-ray diffraction facilities. The hardness of the resultant coatings was also measured. The effects of the current density on the tribological properties of Ni-Co coatings were investigated. The results showed that although increasing current density showed increasing coating thickness, the wear resistance of the Ni-Co alloys was decreased due to Co depletion in the deposited layer.
5
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Tribological Behavior of Copper/MWCNT Nanocomposites Produced by Pulse Electrodeposition

51%
Gül H., Uysal M., Akbulut H., Alp A.
Acta Physica Polonica A
|
2014
|
vol. 125
|
issue 2
254-256
EN
Copper coatings containing well-distributed multiwalled carbon nanotubes were obtained by pulse electrodeposition in acidic sulfate bath in order to improve the microhardness and wear resistance of coatings. Multiwalled carbon nanotubes concentration was determined as the most significant factor for the incorporation of multiwalled carbon nanotubes in copper based electrolyte. The amount of embedded multiwalled carbon nanotubes and the microhardness of nanocomposites were found to increase with the increase of multiwalled carbon nanotubes in the electrolyte. The tribological properties of nanocomposites deposited by pulse electrocodeposition technique were studied by reciprocating ball on-disk method. The characterization of the coatings was investigated by scanning electron microscopy and X-ray diffraction facilities. The experimental results indicated that the wear resistance of copper composite is superior to that of pure copper. The friction coefficient and wear rates decreased with the increase in the concentration of multiwalled carbon nanotubes in the electrolyte.
6
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The Preparation of Core-Shell Al_2O_3/Cu Composite Powders by Electroless Plating in the Alkaline Solution

51%
Uysal M., Karslioğlu R., Alp A., Akbulut H.
Acta Physica Polonica A
|
2013
|
vol. 123
|
issue 2
238-240
EN
In this study, Cu-coated Al_2O_3 composite powders were synthesized by using electroless plating method. The influence of the plating bath composition and ceramic powder concentration on the Cu plating was characterized by scanning electron microscopy, energy dispersive spectroscopy, and X-ray diffraction techniques. The results showed that the electroless bath composition plays an important role for the structure of nano core-shell Al_2O_3/Cu composite powders. The content of copper in the composite powders could be effectively controlled by adjusting the content of copper sulfate and formaldehyde in the plating solution. Furthermore, the pretreatment of the Al_2O_3 powders is also a key factor to form a uniform shell copper layer coating on Al_2O_3 particles.
7
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Characteristics Bronze/Al_2O_3(Ni) Reinforcement Metal Matrix Composite Produced by Current Activated Sintering

51%
Uysal M., Karslioğlu R., Akbulut H., Alp A.
Acta Physica Polonica A
|
2013
|
vol. 123
|
issue 2
235-237
EN
In this study, a bronze matrix (90 wt% Cu + 10 wt% Sn) was reinforced with Al_2O_3 particles using mechanical alloying and then produced by a subsequent rapid current sintering technique. The mechanically ball milled bronze powders were reinforced with electroless Ni coated 20 vol.% Al_2O_3 particles with three different particle sizes of 90, 70, and 50 μm. Microhardness testing, and scanning electron microscopy were used for the structural characterization of the composites. The tribological behavior of the resultant composites was tested by the ball-on-disk method at 1.0 N applied load with 0.3 m/s sliding speed for determination the wear loss and friction coefficient features against a counterface steel ball.
8
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Electrochemical Performance of Pulse Electrodeposited Sn-Ni/MWCNT Composite Anode for Lithium-Ion Batteries

45%
Uysal M., Görmüş H., Karslıoğlu R., Alp A., Akbulut H.
Acta Physica Polonica A
|
2014
|
vol. 125
|
issue 2
353-356
EN
Grain size, and MWCNT content in the electrolyte of nanocrystalline Sn-Ni/MWCNT composite deposits produced from a solution containing nickel chloride and tin chloride at constant electrodeposition conditions (pulse on-time T_{on} at 2.5 ms and pulse off-time T_{off} at 7.5 ms) but with different peak current densities were investigated. The structure of the electroplated thin film Sn-Ni/MWCNTs composite electrode is investigated by X-ray diffraction, scanning electron microscopy. Galvanostatic charge/discharge measurements were performed in the assembled CR2016 cells designed by using anode composite material produced by pulse electro co-deposition. These cells discharge capacities were cyclically tested by a battery tester at a constant current in voltage range between 0.02 and 1.5 V. The electrochemical results showed that the increase in the discharge capacity of the assembled cell was produced when compared with conventionally used graphite lithium-ion batteries.
9
Content available remote

Si/Mo/MWCNT Nanocomposites for Lithium Ion Battery Applications

45%
Cetinkaya T., Uysal M., Tokur M., Kartal M., Akbulut H.
Acta Physica Polonica A
|
2015
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vol. 127
|
issue 4
1048-1051
EN
In this study, silicon/multi-wall carbon nanotube (Si/MWCNT) and silicon/molybdenum/multi-wall carbon nanotube (Si/Mo/MWCNT) composites were produced by high speed planetary ball milling. Produced Si/MWCNT composite containing 50 wt.% Si and 50 wt.% MWCNT and dispersingdifferent amount of molybdenum nanopowders (1 wt.%, 3 wt.% and 5 wt.%) Si/Mo/MWCNT composites were produced by high speed planetary ball milling. Surface morphology of produced composite electrodes was characterized using scanning electron microscopy (SEM) and EDS dot-map analyze was performed to investigate dispersion of MWCNT and molybdenum powders in the composite structure. X-ray diffraction (XRD) technique was carried out to investigate structure of produced Si/Mo/MWCNT composites. Electrochemical performance of the electrodes were tested between 50 mV and 1.5 V in CR2016 test cell.
10
Content available remote

The Effect of Inorganic Nano Powder Additives in TEGDME for Lithium Air Batteries

45%
Kartal M., Uysal M., Cetinkaya T., Alp A., Akbulut H.
Acta Physica Polonica A
|
2015
|
vol. 127
|
issue 4
1016-1018
EN
SiO₂ and Al₂O₃ nano fillers were added to an electrolyte composed of a solution 1 M LiPF₆ in tetra ethylene glycol dimethyl ether (TEGDME) and the effects of these nano powders on capacity and cycling performances were investigated. Galvanostatic charge/discharge (GC) measurements were performed in the assembled Li-air cells by using the nanocomposite electrolytes. The discharge capacities of these cells were cyclically tested by a battery tester at a constant current in the voltage range between 2.15 V and 4.25 V. Discharge products of nanocomposite electrolytes were characterized by SEM and XRD spectroscopies. The electrochemical results demonstrated that Al₂O₃ reinforced electrolyte showed higher discharge capacity and cyclability than those of SiO₂ reinforced electrolyte.
11
Content available remote

Cr and V Substitution in the LiMn₂O₄Spinel Positive Electrode Li-Ion Batteries

45%
Akbulut A., Cetinkaya T., Guler M., Uysal M., Akbulut H.
Acta Physica Polonica A
|
2015
|
vol. 127
|
issue 4
1019-1022
EN
In this study, LiCr_{0.2}V_{0.4}Mn_{1.4}O₄ cathode active electrode materials were produced via a facile sol-gel method at 800°C. The surfaces of the LiCr_{0.2}V_{0.4}Mn_{1.4}O₄ cathode active electrode materials were then coated with Cu in order to increase the conductivity and suppress the manganese ion dissolution into the electrolyte. The structure and electrochemical properties of the obtained Cr and V substituted LiMn₂O₄ powders were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), galvanostatic charge- discharge test and electrochemical impedance spectroscopy (EIS). The improvement in the cycling performances attributed to stabilization of spinel structure by bication ion substation and Cu coating on the spinel particles. EIS analysis confirmed that bication doping and conductive Cu coating contributed stability of the spinel electrodes and provided stable electrolyte/electrode interface due to the suppression of electrolyte decomposition
12
Content available remote

Evaluation of Li-Air Batteries With EC-DEC Based Nanocomposite Electrolytes

45%
Akbulut A., Guler M., Cetinkaya T., Uysal M., Akbulut H.
Acta Physica Polonica A
|
2015
|
vol. 127
|
issue 4
1023-1025
EN
Electrolytes based on organic carbonate solvents of ethylene carbonate (EC) and diethyl carbonate (DEC) were prepared by using LiPF₆ as the Li-source. Nano sized Al₂O₃ (50 nm) was used as a reinforcing component in order to control corrosion and Li₂CO₃ formation. Corrosion of the Li foil anode and electrochemical tests were performed by using EC/DEC/LiPF₆ and nanocomposite EC/DEC/LiPF₆/5wt.% Al₂O₃ electrolytes. Electrochemical tests were performed in the swagelok cells by using Li foil anode and carbon air cathode electrodes. Structural tests were carried out by using scanning electron microscopy (SEM), x-ray diffraction (XRD) and Raman spectroscopy. Results revealed that incorporation of nano Al₂O₃ leads to a decrease of corrosion rate of Li anode and a small decrease in the capacity of the air cells.
13
Content available remote

Preparation and Characterization of Copper Powders with Sn Coating by the Electroless Plating

33%
Uysal M., Cetinkaya T., Gul H., Kartal M., Algul H., Tokur M., Alp A., Akbulut H.
Acta Physica Polonica A
|
2015
|
vol. 127
|
issue 4
1106-1108
EN
In this work, Sn-Cu composite powders were produced using an electroless process. The tin content on the surface of copper powders was varied by using different concentrations of SnSO₄ in the plating bath. The surface morphology of the produced Sn-Cu composite powders was characterized using scanning electron microscopy (SEM). Energy dispersive spectroscopy (EDS) was used to determine the elemental surface composition of the composites. X-ray diffraction (XRD) analysis was performed to investigate the structure of the Sn-Cu composite powders. The electrochemical performance of Sn-Cu nanocomposites was studied by charge/discharge tests.
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