Yazar "Sulu, Ismail Yasin" seçeneğine göre listele
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Öğe BEHAVIOUR OF BI-ADHESIVE IN DOUBLE-STRAP JOINT WITH EMBEDDED PATCH SUBJECTED TO BENDING(Sciendo, 2015) Temiz, Semsettin; Adin, Hamit; Sulu, Ismail YasinIn this study, behaviour of hi-adhesive used in the repair of damaged parts was analyzed, using the finite element method. In a double-strap joint with an embedded patch, patch is embedded into the adherents for structural requirements. In addition, to increase the strength of the joint, two adhesives are used to bond the adherents. This approach reduces stress concentration at the overlap ends, ad capacity and delays the failure. These effects give rise to strength. For this purpose, a stiff adhesive, FM73 produced by Cytec Fiberite. was applied in the middle portion of the overlap, while a softer adhesive, SBT9211 from 3M, was applied towards the edges, prone to stress concentrations. Non-linear finite element analyses were carried out to predict the failure loads, to assist with the geometric design and to identify effective ratios of sizes to maximize joint strength.Öğe Experimental failure testing and repair of internal pressurized composite pipes using different fracture models(Carl Hanser Verlag, 2016) Sulu, Ismail Yasin; Sahinaslan, Apdul-mutalipThe failure testing and repair of composite pipes using different fracture models and different orientation angles under internal pressure was experimentally investigated. Patches with different dimensions were made from composite material for repair. Fracture models on composite pipes were created for three different angles. These are horizontal crack, vertical crack and inclined crack. Adhesive layers created by using DP 410 for repair and failure testing of the composite pipes with different fractures were carried out. Failure loads were obtained from experimental tests. The shear extension coupling of composite pipe and patch was considered because the lay- up angles with + theta and - theta layers were in different radii. Effects of orientation angles and types of fracture models were investigated regarding interaction between the pipe, the adhesive and the patch. The most effective patch width and orientation angles were determined.Öğe Failure analysis of an adhesively joined composite pipe system under internal pressure(Carl Hanser Verlag, 2018) Sulu, Ismail Yasin; Temiz, SemsettinFailure and stress analyses of adhesively joined composite pipe systems of varied orientation angles under internal pressure have been carried out using the 3-D finite element method (FEM) and experimentally. Composite pipes adhesively joined without sleeves were examined. The composite pipes were produced from E-glass fiber and adhesively joined using the adhesive types DP410 and DP490. The numerical model was created using ANSYS software and the efficiency of the model was verified by the experimental results. The finite element analyses (FEA) and experimental tests were carried out to predict the failure internal pressure. The internal failure pressures were obtained from experimental tests and compared with the numerical results. Radial, tangential, axial and shear stress values were obtained via numerical analyses in composite pipes and in the adhesive layers. In addition, the von Mises stress distributions in the adhesive were obtained. The effects of the orientation angles were investigated in the interface region between the pipes and the adhesive. The most effect parameters were determined for the composite pipe system joined at various pipe radii. It was found that the composite pipes could be used under high internal pressure, a fact that is important for industrial applications.Öğe Failure and stress analysis of internal pressurized composite pipes joined with sleeves(Taylor & Francis Ltd, 2018) Sulu, Ismail Yasin; Temiz, SemsettinFailure and stress analyses were carried out for composite pipes adhesively joined with sleeves subjected to internal pressure. In the study, the composite pipes and sleeves were E glass fiber/epoxy with different fiber orientation angles. Circular pieces cut from four layered composite pipes with different orientation angle were used as sleeves. Composite pipes with different orientation angle were bonded using DP410 and DP490 type adhesives. The codes of a numerical model were generated via ANSYS software package for the numerical analyses, and the numerical results were verified using experimental results. The problems were analyzed by using a calculation method based on finite elements method (FEM). The finite element analyses (FEA) were carried out to predict the failure internal pressure. Radial, tangential, axial and shear stress values were obtained via numerical analyses for composite pipes and adhesive layers in the thickness direction. In addition, Von-Mises stress distributions that develop on the adhesive were obtained as well. The effects of orientation angle, sleeve length and adhesive type on strength of composite pipe and bonded zone were examined. The results showed that the adhesive type has higher effect on the strength of bonded composite pipes when compared with orientation angle and sleeve length. In addition, increase in sleeve length increased the failure internal pressure.Öğe Mechanical analysis of composite plates adhesively joined with different single-lap techniques under bending loading(Walter De Gruyter Gmbh, 2023) Sulu, Ismail YasinIn this study, composite plates adhesively joined using single-lap joint without intermediated material (SLJ) and intermediated material (IM-SLJ) subject to bending loading were investigated via finite element analysis. DP 410 type adhesive was used. Composite parts and intermediate material were preferred as T700 carbon/epoxy. Numerical analyses were carried out using ANSYS 14.5 software package, in which the finite element method was taken into account. Failure situations for adhesive and composites were examined by the von-Mises failure criteria and the Tsai-wu failure criteria, respectively. Firstly, the failure loads for each parameter situation were determined. The equivalent stresses of the critical stress lines on adhesive layers were examined and critical stresses line were determined for length and width of adhesive layers. Shear, normal, and von-Mises stresses were investigated at obtained failure load for each parameter of SLJ and IM-SLJ. The von-Mises on the critical stress lines were compared for different overlap width and length of SLJ and IM-SLJ. The effects of joint techniques, orientation angles, and overlap dimensional were investigated on adhesive layer, and joint techniques were compared about advantages. A different study from the literature was carried out to compare the mechanical behavior of SLJ and IM-SLJ joining techniques.Öğe Mechanical analysis of hybrid structured aircraft wing ribs with different geometric gaps(Walter De Gruyter Gmbh, 2024) Akdogan, Tumay Battal; Sulu, Ismail YasinWing ribs, which play a critical role in aviation, are an important design element, especially for unmanned aerial vehicles. Aircraft wing ribs are structural elements that generally extend from the wing root to the tip, used to maintain the shape of the wing, provide aerodynamic stability and add durability to the wing surface. In this study, the wing root rib of the MQ-1B Predator unmanned aerial vehicle were modeled with cavities with different geometric structures and its mechanical behavior were examined. Wing rib structures were created from circular, elliptical, slot and beam geometry gaps. The hybrid structure was created by considering the combined use of Carbon-Kevlar-Aramid. In the hybrid structure, the thickness of each fiber layer was taken into account as 0.25 mm and the wing rib consisted of six layers. The effects of different fiber angles in hybrid composite structures were also examined. As a result of the analyses, equivalent stress (von-Mises stress) and total deformation results were examined.Öğe Mechanical behavior of composite parts adhesively jointed with the insert double-lap joint under tensile load(Springer Heidelberg, 2018) Sulu, Ismail YasinIn this paper, composite parts jointed with insert double-lap joint (DLJ) subjected to tensile load were analyzed by using 3-D finite element method (FEM). In the analysis, the composite parts were carbon/epoxy (T 700) with different fiber orientation angles and the adhesive was DP 410. The models for the numerical analyses were generated by using the ANSYS 14.5 software package. The finite element analyses (FEA) were carried out to predict the failure loads. Stress at x, y, and z directions; shear stresses; and the von-Mises stresses on adhesive were obtained at the time of the failure for predetermined parameters. Consequently, the effects of orientation angles, overlap widths and length, and adhesive layer were examined. The most effective parameters were determined for composite parts adhesively bonded with the double lap joint.Öğe Mechanical behavior of composite parts joined through different processes(Walter De Gruyter Gmbh, 2021) Sulu, Ismail Yasin; Temiz, SemsettinIn this research, composite parts joined according to different joining methods such as single-lap and double-lap embedded adhesive subjected to tensile load were analyzed via the 3-D finite element method (FEM). The study differed from other studies in terms of joining techniques used and the specified parameter and model design. This study aims to emphasize the advantages of joining techniques in terms of aesthetically and joining methods over each other. In the analysis, composite parts carbon/epoxy (T 700) at varied fiber orientation angles and adhesive DP 410 were used. The models for numerical analyses were created in an ANSYS 14.5 software package. Finite element analysis (FEA) was successful in predicting failure loads. Stress in the x, y, z directions, shear stress and von-Mises stress on the adhesive were obtained at the time of failure for predetermined parameters. As a result, the effects of orientation angles, overlap lengths, adhesive layer and bonding methods were investigated. The maximum effect parameter and joining technique was determined for the composite parts joined through varied joining methods.Öğe Mechanical behavior of composite pipes joined with non-embedded and embedded adhesive layers(Carl Hanser Verlag, 2020) Sulu, Ismail Yasin; Temiz, SemsettinIn this study, the mechanical behavior of composite pipes joined with embedded and non-embedded adhesive layers is investigated. Due to their high resistance, corrosion resistance, repair and lightness, composite materials have been used in industry increasingly. In general, composite pipes are used for the transport of pressurized liquids and gases. Joining processes are performed using many different methods. This study is intended to facilitate the joining process of composite pipes and to increase their applicability. In this study, the development of various bonding methods were investigated using composite pipes and double reinforced structural adhesives. Likewise stress behavior was analyzed. Generally, models with patch and patch quality are found in the literature.In this study by contrast, joining operations will be made easier by means of composite pipe joining models designed using glue without a patch. As a result, time and extra cost savings can be achieved.Öğe Mechanical behavior of internal pressurized composite pipes jointed with embedded tubular sleeves(Carl Hanser Verlag, 2017) Sulu, Ismail YasinIn this paper, composite pipes bonded with embedded tubular sleeve subjected to internal pressure were analyzed by using the three dimensional finite element method (FEM). In the analysis, the composite pipes and sleeves are made of carbon/epoxy (AS4/3501-6) with different fiber orientation angles and DP 410 is the adhesive. The shear extension coupling of composite pipe and patch was considered because the lay-up angles with +theta and -theta layers were in different radii. The models for the numerical analyses were generated by using the ANSYS software package. The finite element analyses (FEA) were carried out to predict the failure loads. Radial, tangential, axial and shear stress values were obtained via numerical analyses on composite pipes and adhesive l ayers. In addition, the von Mises stress distributions on the adhesive were obtained. Consequently, the effects of orientation angles, overlap widths and adhesive layer were examined. The most effective parameters were determined for composite pipes adhesively bonded with embedded tubular sleeve.Öğe Mechanical behavior of mode-I crack propagation between composite adhesive joints(Carl Hanser Verlag, 2018) Sulu, Ismail YasinFailure testing and an analysis of mode-I crack propagation between composite parts joint with adhesive was the object of this investigation. We offer a finite element analysis (FEA) for calculating failure loads when simulating crack growth between three-dimensional composite parts joint with adhesive as well as an analysis of the effect of crack length on adhesive joint performance. Likewise, we have examined the effects of orientation angles on crack length and failure load. For this analysis, composite parts are made of carbon/epoxy (AS4/3501-6) with different fiber orientation angles. DP 410 was the adhesive used. The models for the numerical analyses were generated by using an ANSYS software package. The finite element analyses were carried out in order to predict failure loads. Stress at x, y, z directions, shear stress and von-Mises stress on adhesive were obtained at the time of failure for predetermined parameters. Lastly, we examined the effects of orientation angles, crack length, and adhesive layer.Öğe Mechanical behavior of pressurized composite pipes made of various materials(Carl Hanser Verlag, 2020) Sulu, Ismail Yasin; Temiz, SemsettinIn this study, multi-layered composite pipes with varied orientation angles and subjected to internal pressure were investigated by using the 3-D finite element method (FEM) and through experimental tests. The composite pipes were made of E-glass and T300/934 carbon fiber. The studies were carried out experimentally, analytically and numerically. The T300/934 carbon fiber reinforced composite pipes and E-glass reinforced composite pipes were given numerical model codes via ANSYS 14.5 software. These models were then compared with analytical results in the literature and with the experimental results. Finite element analyses (FEA) were carried out to predict failure loads. Each layer of the composite pipes was numerically examined from various orientation angles. Hoop and shear stress wereobtained numerically for each layer. Radial strain and radial stress were achieved in the radial direction of the composite pipes. Shear extension coupling was considered because the layup angles with + theta and - theta layers were in varied radii. Subsequently, the effects of the orientation angles were examined for all models. Moreover, it was found that an embedded adhesive joint is important for industrial applications.Öğe Mechanical behavior of single-lap and double-lap adhesive joined composite parts(Carl Hanser Verlag, 2017) Sulu, Ismail YasinThe composite parts bonded with embedded single lap joint (SLJ) subjected to tensile load were analyzed previously. The embedded adhesive was applied between two composite parts and the mechanical behavior of the joint was examined. In this study, composite parts bonded with single-lap joint (SLJ) and double-lap joint (DLJ) subjected to tensile load were analyzed by using 3D finite element method (FEM). The advantages of two different joint methods were investigated. In the analysis, the composite parts were carbon/epoxy (AS4/3501-6) with different fiber orientation angles and the adhesive was DP 410. The models for the numerical analyses were generated by using the ANSYS software package. The finite element analyses (FEA) were carried out to predict the failure loads. Stress in x-, y-, z-directions, shear stresses and the von-Mises stresses on adhesive were obtained at time of failure for predetermined parameters. Consequently, the effects of orientation angles, overlap dimensions and joining methods were examined. The most effective parameters and joining process were determined for composite parts with single-lap and double-lap joints.Öğe Mechanical characterization of composite pipe systems joined using different radii pipes subject to internal pressure(Taylor & Francis Inc, 2023) Sulu, Ismail Yasin; Temiz, SemsettinFailure tests for internal pressurized composite pipe system joined by using different radii pipes were carried out by the finite element method and experimental tests. The composite pipes were produced from E glass fiber/epoxy. DP410 and DP490 type adhesives were used to join the composite pipes. The numerical results and experimental results were compared. It was shown that the numerical analyzes results were close to experimental results. Tangential, radial, axial, and shear stress values on composite pipes and adhesive layers were obtained via numerical analyses in the radial direction. Additionally, the von Mises stress distributions were obtained on the adhesive. The effects of adhesive layer lengths, adhesives types, and orientation angle on the effect of the joint zone were investigated.Öğe Mechanical testing and analysis of composite parts adhesively joined under tensile load(Carl Hanser Verlag, 2017) Sulu, Ismail YasinIn this paper, composite parts bonded with embedded single lap joint (SLJ) subjected to tensile load were analyzed by using 3D finite element method (FEM). In the analysis, the composite parts are carbon/epoxy (AS4/3501-6) with different fiber orientation angles and the adhesive is DP 410. The models for the numerical analyses were generated by using ANSYS software package. The finite element analyses (FEA) were carried out to predict the failure loads. Stress in x-, y-and z-directions, shear stresses and the von-Mises stresses on adhesive were obtained at the time of the failure for predetermined parameters. Consequently, the effects of orientation angles, overlap widths and length, and adhesive layer were examined. The most effective parameters were determined for composite parts adhesively bonded with embedded single lap joint.Öğe Numerical study of composite plates jointed adhesively with interspaced and interspaced double-lap joint subject to tensile load(Walter De Gruyter Gmbh, 2022) Sulu, Ismail YasinNumerical study was carried out for layered composite plates joined with both interspaced and interspaced double-lap joint subject to tensile load. The numerical analyses were actualized using ANSYS 14.5 software package based on finite elements method. The layered composite plates with different orientation angles were considered. It was considered that the composite plates and patches were carbon/epoxy (AS4/3501-6) and the composite plates were joined using DP 410 adhesive. The studies started with the determination of the failure loads the stresses in these loads were obtained. Normal and shear stress in all directions were obtained via numerical analyses for composite layers and adhesive layers throughout radial thickness. Moreover, the von-Mises stress distributions that develop on the adhesive were obtained as well. The effects of adhesive and orientation angles were examined at the adhesive and composite layers interfaces. The effect of the surfaces is great in the gap-free bonding of the surfaces. But the strength of the adhesive is more important than the condition of the adhesion surfaces in interspaced bonding.
