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Öğe Analysis of Angle of Twist of Axially Layered Functionally Graded Circular Hollow Shafts(2018) Evran, SavaşIn this study, the angle of twist of axially layered functionally gradedcircular hollow shafts subjected to a twisting torque at the free end was analyzedunder clamped-free boundary conditions using finite element software ANSYS. Thehollow shafts were made using three layers including various mixtures of ceramicand metal materials. Layer locations on the shafts were performed using L9orthogonal array based on Taguchi Method. The layer combination with optimumlevels was obtained using analysis of the signal-to-noise (S/N) ratio. Significantlayers and their percent effects on the angles of twist were analyzed using analysisof variance (ANOVA). According to results obtained, the increase of the ceramicmaterial in layers leads to the decrease of the angle of twist of the beams. The mostmeaningful layers on response were obtained as first layer with 52.83 % effectratio, second layer with 29.41% effect ratio, and third layer with 17.76 % effectratio.Öğe BENDING STRESS ANALYSIS OF AXIALLY LAYERED FUNCTIONALLY GRADED BEAMS(2018) Evran, SavaşIn this study, the bending stress analysis of axially layered functionally graded beams subjected to their ownweight were evaluated under clamped-free (C-F) boundary condition. The beams have four layers and each layerconsist of different aluminium (Al)/monotungsten carbide (WC) systems based on increasing of the 6% WC. Thelayer positions in the beams were performed based on Taguchi L16 (4*4) orthogonal array design. The layerswere considered as control factors and each layer has four levels. The analysis of signal-to-noise (S/N) ratioswere used to obtain the optimum layer levels. Analyses were performed using finite element software ANSYS.In addition, analysis of variance (ANOVA) was performed to determine the important levels and percentcontributions of the layers on the responses. The numerical results show that the increasing of the layer levelsincreases the bending stress and percent contributions of Layer 1, Layer 2, Layer 3 and Layer 4 on the bendingstress were obtained as 1.12%, 11.83%, 29.54% and 57.48%, respectively.Öğe Buckling Analysis of Cantilever Laminated Hybrid Composite Plates using Finite Element and Statistical Methods(Alanya Alaaddin Keykubat Üniversitesi, 2021) Evran, SavaşIn this study, the critical buckling load of hybrid composite plates with three layers was analyzed using numerical and statistical methods. Laminated hybrid composite plates were designed using glass-epoxy, boron-epoxy, carbon-epoxy, and metal. The outermost layers of the plates were modelled using fiber reinforced composite materials whereas the innermost layer of plates was created using Aluminum material (Al2024-T3). Numerical buckling behavior was calculated using finite element software ANSYS. Analysis of signal-to-noise ratio was utilized to decide the effects and optimal levels of the plates and their fiber orientation angles on buckling load. Analysis of variance at the 95 % confidence level was employed to indicate the control factors which have significant effect on the buckling responsesÖğe BUCKLING TEMPERATURE ANALYSIS OF LAMINATED COMPOSITE PLATES WITH CIRCULAR AND SEMICIRCULAR HOLES(2020) Evran, SavaşThis statistical and numerical study deals with buckling temperature behavior of laminated composite plates with centralcircular and semicircular holes. Numerical buckling temperature analyses were performed using finite element softwareANSYS based on Taguchi L18 orthogonal array. The plates were designed from graphite/epoxy systems. Fiber orientationangles and cutout shapes of the plates were assumed to be the control factors. Analysis of signal-to-noise ratio was used inorder to investigate of the effects of fiber orientation angles and cutout shapes on the critical buckling temperature of the plates.Also, analysis of variance was performed in order to see percentage contribution rates and significance levels of control factors.Öğe Critical Buckling Load Analysis of Layered Functionally Graded Shell Structures(2018) Evran, SavaşIn this study, critical buckling load analysis for first mode of layered functionally graded shell structures made of silicon nitride (Si3N4)/stainless steel (SUS304) systems is studied. The shell structures are considered as three layers and the layer positions are carried out according to L9 (33) orthogonal array. The mechanical properties of the layers are calculated according to a simple rule of mixture of composite materials. The mechanical properties of the layers is assumed to be control factors. Optimum layer levels are obtained using signal to noise (S/N) analysis. Significant layers and their percent contributions on the results are detected using analysis of variance (ANOVA). Maximum buckling load value is carried out based on different arrangements of optimum layer levels.Öğe Effects of Fiber Type and Number of Layers on Modal Analysis of Laminated Composite Plates(Alanya Alaaddin Keykubat Üniversitesi, 2022) Evran, Savaş; Yılmaz, YasinThe goal of this study is to examine the effects of fiber type and number of layers on modal analysis oflaminated composite plates using finite element and Taguchi methods. Modal analysis was carried out byfinite element software ANSYS in accordance with L9 orthogonal array which has two control factors suchas fiber types and number of layers. Optimal levels of fiber types and number of layers were determinedusing analysis of Signal-to-Noise ratio, while importance levels and percentage effects of control factorswere performed using analysis of variance at 95% confidence level. According to results obtained from thisstudy, the maximum fundamental natural frequency value was calculated using boron-fiber-reinforcedlaminated composite plates with three layers. Numerical and statistical results obtained from this study canbe useful to select the appropriate fiber types and number of layers for laminated composite platesÖğe Eigenvalue Buckling Analysis of Beams with Different Width and Square Cutout(Aksaray Üniversitesi, 2022) Evran, Savaş; Yıldır, Salih ZekiIn this study, effect of square cutout and beam widths on eigenvalue buckling analysis of beams is evaluated using finite element and Taguchi methods. ANSYS software is used to perform the finite element analyses and the analyses were conducted Taguchi L9 orthogonal array with three control factors. Each control factor has three levels. The first control factor is considered as position of square cutout whereas the second control factor was assumed as beam widths. The influence of levels of the beam widths and square cutouts on responses is determined using analysis of signal-to-noise ratio whereas variance analysis was operated to notice the effect of each control factor on the buckling behavior of the beams. According to results obtained from the study, the buckling value of the beams increase as the square cutout get closer to the free edge. Increase of the beam widths leads to an increase on buckling result of the beams. The effect of beam width on the buckling analysis is higher than square cutout.Öğe Eksenel yönde tabakalı kirişlerin temel frekansı üzerinde tabaka dizilişinin etkileri(2017) Evran, Savaş; Yılmaz, YasinBu çalışmada eksenel yönde tabakalara sahip kirişlerin serbest titreşim davranışı üzerinde tabaka dizilişininetkisi Timoshenko kiriş teorisine göre sonlu elemanlar programı (ANSYS) kullanılarak incelenmiştir. Hertabaka Alüminyum/Alüminyum oksit, Alüminyum/Zirkonyum ve Alüminyum/Nikel gibi farklı sistemleresahiptir. Tabaka dizilişi Taguchi Metodunda L9 orthogonal dizi kullanılarak yürütülmüştür. Optimumtabaka dizilişini elde edebilmek için Taguchi Metodu ve optimum tabaka kombinasyonu kullanıldı. Yanıtlarüzerinde önemli tabakaları ve katkı yüzdelerini gerçekleştirebilmek için Varyans Analizi (ANOVA)kullanıldı. Sonuçlara göre yanıtlar üzerinde en etkili parametreler sırasıyla %67.94 ileAlüminyum/Alüminyum oksit, %31.08 ile Alüminyum/Nikel ve %0.95 ile Alüminyum/Zirkonyum içinelde eddilmiştir. İlk mod olarak da bilinen temel frekans değerleri tabakalardaki Alüminyum/Alüminyumoksit ve Alüminyum/Zirkonyum içeriklerinin artmasıyla artmış ve Alüminyum/Nikel içeriğinin artması ileazalmıştır.Öğe Finite element analysis of thermal stress of laminated composite plates using Taguchi method(2019) Evran, SavaşIn present study, thermal stress behavior of laminated composite plates subjected to constanttemperature load was investigated using Taguchi method according to von Mises stress.Numerical thermal stress analyses were conducted based on L8 orthogonal array including fourcontrol factors with two levels. Fiber orientation angles of laminates for the plates were used tobe control factors. Finite element analysis of the plates was carried out using ANSYS software.Fiber angles with optimum levels and their effects on thermal stress of plates were detectedusing analysis of signal to noise (S/N) ratio. Level of importance of laminates and percentageeffect ratio of each laminate on von Mises stress were determined according to analysis ofvariance (ANOVA).Öğe Impacts of Valve Angle and Fluid Velocity on Pressure Drop in Pipe Flow(Nişantaşı Üniversitesi, 2022) Evran, SavaşThe aim of this study is to evaluate the effects of valve angle and fluid velocity on pressure drop in pipe flow using ANSYS Fluent software. Flow analyses were conducted using Taguchi L8 orthogonal array with two control factors. The valve angle in the pipe was chosen as the first control factor, while the fluid velocity was selected as the second control factor. The optimum levels of each control factor and its effect on the results were determined using Signal-to-Noise ratio analysis. The significance level and contribution rates of each control factor on the responses were determined using analysis of variance. As a result of this study, the increase of fluid velocity and valve angle causes an increase in pressure drop. Maximum pressure and velocity changes were observed on the valve. It was determined that the effect of the fluid velocity in the pipe on the pressure drop was lower than the effect of the valve angle.Öğe INVESTIGATION OF PEAK POWER AND TECHNOLOGY OF PHOTOVOLTAIC IN ENERGY OUTPUT ACCORDING TO SYSTEM LOSS(Ahmet Ali SÜZEN, 2020) Evran, Savaş; Deniz, OzanThe aim of this study is to evaluate the effects of peak power and technology of photovoltaic (PV) in energy output from fix-angle PV system according to system loss. The maximum efficiency tests were conducted using L8 orthogonal array with three control factors including two levels based on Taguchi method. Control factors consist of Peak PV power, PV technology, and system loss. In order to organize the optimum levels and effects of the control factors in the energy output, signal-to-noise (S/N) ratio analysis was implemented. The most effective control factors in the energy output were found by analysis of variance (ANOVA). According to results obtained, , the most control factors in energy output were detected as peak PV power with 65.60 % contribution, PV technology with 19.37 % contribution, and system loss with 14.94 % contribution, respectively. The increase of levels of peak PV power and PV technology leads to the increase of energy output data while increase of level of system loss causes the decrease of energy output.Öğe NATURAL FREQUENCY ANALYSIS OF LAYERED FUNCTIONALLY GRADED BEAMS(2018) Evran, SavaşIn this numerical study, natural frequency analysis of the layered functionally graded beams in the thickness direction forclamped-clamped and clamped-free boundary conditions was investigated using finite element software ANSYS and the effectsof the layers on natural frequency analysis for first mode were evaluated under clamped-free boundary condition. The layerarrangements of the beams were performed according to Taguchi L9 (3x3) orthogonal array. Mechanical properties of thelayers made of different volume fractions of Ti-6Al-4V and ZrO2 materials was assumed as control factors. In order todetermine the optimum layers and their levels, signal-to-noise (S/N) ratio analysis was used. Significant layers and their percentcontributions on the first mode natural frequency were carried out using Analysis of Variance (ANOVA). In addition, theeffects of the boundary conditions (B.C.) such as clamped-free (C-F) and clamped-clamped (C-C) and positions of the optimumlayers were evaluated. According to results observed, maximum first mode natural frequency for C-F boundary condition usingoptimum layers were found using the FG beams with top and bottom layers with ceramic-rich and middle layer with metalrich.The most effective layers on the responses was obtained as L1 with 48.4523%, L2 with 16.1547% and L3 with 34.9839%.Layer arrangements for C-F boundary condition play important role on the natural first mode frequency.Öğe Numerical and Statistical Aerodynamic Performance Analysis of NACA0009 and NACA4415 Airfoils(Gazi Univ, 2024) Evran, Savaş; Yıldır, Salih ZekiIn this numerical and statistical study, lift and drag coefficient performances of NACA-0009 and NACA-4415 airfoils were evaluated in accordance with various attack angle at constant velocity of wind. Lift and drag coefficients of airfoils was numerically determined by computational fluid dynamics code ANSYS FLUENT. Analysis design of numerical calculations was implemented using L16 orthogonal array based on Taguchi method. Angles of attack and airfoil types were considered as control factors. The optimum level and effect of each control factor on responses was statistically implemented using analyses of Signal-to-Noise ratio and variance. As a result of this study, maximum lift and minimum drag coefficient were achieved by using NACA4415 airfoil compared to NACA0009 airfoil. The increase of the angle of attack leads to the increase on the lift and drag coefficients for both airfoils.Öğe Numerical and statistical buckling analysis of laminated composite plates with functionally graded fiber orientation angles(Sage Publications Ltd, 2020) Evran, SavaşThe aim of this numerical and statistical study was to investigate the buckling analysis of laminated composite plates containing functionally graded fiber orientation angles. The laminated composite plates had functionally graded fiber orientation angles based on Taguchi's L18 (2(1)x 3(2)) orthogonal array. The fiber orientation angles were considered to be control factors. Numerical analyses were performed using finite element software ANSYS. The optimum critical buckling load and the effects of fiber orientation angles for maximum data were determined using the analysis of the signal-to-noise ratio. The importance levels of laminates and their percent contribution on the buckling characteristics were calculated using analysis of variance. Regression analysis was employed to investigate the effects of control factors on buckling responses mathematically. The effects of laminate stacking sequence, mesh size, element type, mode number, and boundary condition were carried out using laminates with the optimum levels.Öğe NUMERICAL FIRST MODE FREQUENCY ANALYSIS OF AXIALLY LAYERED FUNCTIONALLY GRADED TAPERED BEAMS(2018) Evran, SavaşThe purpose of this numerical work is to evaluate the first mode frequency analysis of the tapered beams withthree layers, modelled using functionally graded materials (FGM) in the axially direction, under clampedclamped (C-C) boundary condition based on finite element software named ANSYS V13. Analyses wereconducted using L16 Taguchi orthogonal array design consisting of three control factors and four levels. Thelayers were determined as the control factors and were considered to be made from aluminum(Al)/monotungsten carbide (WC) systems. The optimum layer combination was carried out according to theanalysis of signal-to-noise (S/N) ratio. The importance levels and contribution ratios of the layers on the firstmode frequency of the axially layered FG tapered beams were observed by using analysis of variance(ANOVA). Layer 1 and Layer 3 have positive effects on the first mode frequency values. However, Layer 2 hasnegative influence. In addition, the most effective layers are Layer 1 with 82.17%, Layer 2 with 16.36% andLayer 3 with 1.45%, respectively.Öğe THERMAL STRESS ANALYSIS OF AXIALLY LAYERED FUNCTIONALLY GRADED BEAMS USING FINITE ELEMENT AND TAGUCHI METHODS(2018) Evran, SavaşThe aim of this paper is to investigate the thermal stress analysis of axially layered functionally graded beams under clampedclamped(C-C) boundary conditions using finite element software which named ANSYS V13 parametric design language(APDL). The beams were made as three layers using functionally graded materials with Zirconia (ceramic) and Aluminum(metal) systems. The order of the layers of the beams was designed using L9 orthogonal array depending on Taguchi Method andthus nine different beam configurations were used. Analysis of signal-to-noise (S/N) ratio was performed to determine the effectsof optimum levels of layers on the thermal stress characteristic. Analysis of Variance (ANOVA) was evaluated to carry out themeaningful layers and the percentage contributions of the layers on the thermal stress response. According to the results, themost effective layers on responses were found to be Layer 1 with 75.70 % contribution, Layer 2 with 21.05 % contribution, andLayer 3 with 3.23 % contribution respectively. In addition, the increase of Young's modulus and thermal expansion values of thelayers lead to the thermal stress results of axially layered functionally graded beams. This paper can be determined as a referencefor thermal stress analysis of the axially layered beams produced functionally graded materials consists of ceramic and metalcontents under clamped-clamped boundary conditions.Öğe THREE-DIMENSIONAL MODAL ANALYSIS OF BEAMS WITH TRIANGULAR AND HEXAGONAL CROSS SECTIONS USING DIFFERENT CERAMIC MATERIALS(Ahmet Ali SÜZEN, 2020) Evran, SavaşThis study deals with investigation of effects of cross sections and ceramic materials on the fundamental vibration behavior of beams. Fundamental frequency analyses were performed using finite element software ANSYS based on Taguchi’s L8 orthogonal array with two control factors. Ceramic material types were used as the first control factor consisting of four levels such as Zirconia (ZrO2), Silicon nitride (Si3N4), Alumina (Al2O3), and Silicon carbide (SiC) while cross-sections of beams were considered as the second control factor including two levels such as triangle and hexagon. To optimize the ceramic materials and cross sections, analysis of signal-to-noise (S/N) ratio was used. Important control factors and their percent contributions on numerical fundamental free vibration response were performed using analysis of variance (ANOVA).
