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Öğe Elastic-plastic and residual stresses in clamped thermoplastic composite laminates loaded transversely(Mathematical and Computational Applications, 2011) Benli, Semih; Karamolla, Mustafa; Okumuş, Fuat; Sayman, OnurIn this study, an elastic-plastic stress analysis was carried out in woven steel fibers- thermoplastic clamped composite laminates. The stacking sequences were chosen as [0/0]2, [15/-15]2, [30/-30]2 and [45/-45]2 for woven steel fibers – thermoplastic composites plates. The layers were chosen for symmetric and antisymmetric cases. The finite element solution was performed by using the ANSYS software. Solid 186 element was utilized in the solution. Normal stress components at the clamped edges were found to be higher than that at the mid point of the laminated plates. Normal stresses are tensile at the mid point of the clamped edges and compressive at the mid point of the laminated plates. Then, the residual stress components were calculated in the critical points of the composite laminates.Öğe Enhancing the Strength of Polylactic Acid Material by Bonding Glass Fiber-Reinforced Polymer Composite Plates With Various Fabric Weights and Orientations(John Wiley and Sons Inc, 2025) Horasan, Murat; Saraç, İsmail; Benli, SemihThis study investigates the impact of applying bidirectional glass fiber fabric-reinforced polymer (GFRP) composite coatings to the top and bottom surfaces of three-dimensional printed polylactic acid (3D-printed PLA) parts on their mechanical properties. The study uses tensile, three-point bending tests, and finite element method (FEM) analysis to examine how the coatings affect the PLA parts. The objective is to enhance the mechanical properties of PLA parts produced by additive manufacturing (AM) so that they can be used in applications requiring high strength. The study involves bonding bidirectional GFRP composites to the outer surfaces of 3D-printed PLA parts using epoxy adhesive to create sandwich-structured composite materials. Two different types of bidirectional glass fiber fabric (GFF) with low weight (25 g/m2) and high weight (100 g/m2) are used as reinforcement materials, while epoxy serves as the matrix material in the composite coatings. The production process involves creating bidirectional-GFF reinforcement materials in two layers, cut at 0° and 45° orientation angles, and bonding them to PLA specimens with epoxy adhesive. Mechanical tests demonstrate increased tensile and flexural strength of PLA parts coated with bidirectional GFRP composite compared to uncoated PLA material. The finite element analyses that simulated tensile and flexural tests showed consistent computational results with experimental findings.Öğe Experimental failure analysis of glass-epoxy laminated composite bolted-joints with clearance under preload(Sage Publications Ltd, 2011) Şen, Faruk; Pakdil, Murat; Sayman, Onur; Benli, SemihIn this study, a failure analysis of glass-epoxy laminated composite bolted-joints with bolt/hole clearance under various torques was carried out. To estimate the effects of joint geometry and fiber orientation on the failure strength and failure mode, parametric studies were conducted experimentally. The two different geometrical parameters were the edge distance-to-hole diameter ratio (E/D) and plate width-to-hole diameter ratio (W/D), E/D ratio was selected from 1 to 5, and W/D ratio was chosen from 2 to 5. The bolt preload torque was also carried out as 0, 3, and 6 Nm. To investigate the material parameters effect, laminated plates were oriented as three different stacking sequences [90(o)](8), [45(o)](8), and [0(o)](8). The experiments were carried out with a clearance between the diameters of the bolt and the circular hole of 5 and 6 mm, respectively. According to experimental results, failure mode and bearing strength are strongly influenced by both material parameters and geometrical parameters. Additionally, when a torque is applied to the bolted-joints, the failure mechanism is affected by its increasing values.Öğe Kompozit takviyeli üst damak diş protezinin farklı sıcaklıklar altında termal gerilme analizi(Niğde Ömer Halisdemir Üniversitesi, 2019) Benli, Semih; Baş, GökhanDiş sağlığını kaybeden hastalarda görüntü, çiğneme, konuşma gibi fonksiyonel bozukluklar görülebilir. Bu fonksiyon bozuklukları insanın hayat standardını direkt olarak etkilemektedir. Bu fonksiyon bozukluklarının giderilmesi amacıyla çıkarılabilir kısmi veya tam protezler sıklıkla kullanılır. Bu çalışmada, sonlu elemanlar metodu kullanılarak üst damak protezinin 0 °C, 36 °C, 70 °C sıcaklık ve uygun sınır koşulları altında CrCo, tekyönlü/örgü karbon epoksi, tek yönlü/örgü cam epoksi, tek yönlü/örgü kevlar epoksi takviyeleri ile beraber, kritik kırılma noktası başlangıcı olan orta hat bölgesinin gerilme analizi incelenmiştir. Elde edilen sonuçlar göstermiştir ki protezlerin dayanımını arttırmak için kullanılan bu takviyeler termal yükleme altında takviyesiz numunelere göre yüksek oranda termal kaynaklı gerilmeler oluşturmaktadır.Öğe Sea water effect on failure behaviour of mechanically fastened composites(Carl Hanser Verlag, 2013) Sayman, Onur; Özen, Mustafa; Şen, Faruk; Benli, SemihIn this study, sea water effect on failure behaviour was investigated for mechanically fastened composites that are oriented as [0/90/45/-60](s). The laminated composite specimens were fastened with two serial fasteners and were tested under non-immersed and immersed conditions, i. e. in sea water for 200 days. The experiments were carried out according to D 5229/D 5229M standard test method for evaluation of moisture absorption properties and equilibrium conditioning of polymer matrix composite materials. The results point out that the immersion into sea water of the composite specimens can cause a decrease in failure loads of both, pinned and bolted joints, particularly.Öğe Strengthening of polylactic acid parts with carbon fiber reinforced polymer composite plates featuring single and double fabric layers in various orientations(John Wiley and Sons Inc, 2025) Saraç, İsmail; Horasan, Murat; Benli, SemihThis study investigated how coating the surfaces of three-dimensional printed polylactic acid (PLA) parts with carbon fiber fabric-reinforced polymer (CFRP) plates affects their mechanical behavior. The assessment was performed through tensile tests, three-point bending tests, and finite element method analysis. The goal of this study was to enhance the mechanical properties of PLA parts produced through fused deposition modeling (FDM) to expand their applicability in structures. CFRP composites were bonded to the 3D-printed PLA parts using epoxy to create sandwich-structured composite samples. The impact of composite coatings on the mechanical properties of 3D-printed PLA parts was examined in relation to fiber orientation angles and the number of coating layers. Mechanical tests indicated that the tensile and flexural strength of PLA parts coated with CFRP composite was higher than that of uncoated PLA material. In tensile tests, the maximum failure load of uncoated PLA specimens was 861.1 N, whereas the maximum failure load of a composite hybrid structural specimen—fabricated by bonding the PLA with a CFRP composite plate at a 0° orientation angle and employing a double layer of carbon fiber fabric—was 4265 N. Consequently, the increase in failure load was 395%. Finite element analyses simulating the tensile and flexural tests produced results that aligned with the experimental findings. Highlights: CFRP composite plates were fabricated with different ply numbers and fiber orientations. The hybrid structures were produced by bonding CFRP plates with 3D-printed PLA parts. Tensile and flexure tests were performed on hybrid composite structures. Reinforcing 3D-printed PLA with CFRP plates improves mechanical properties.Öğe Thermal stress analysis of maxillary dentures with different reinforcement materials under occlusal load using finite element method(Multidisciplinary Digital Publishing Institute (MDPI), 2024) Benli, Semih; Baş, GökhanThe purpose of this study was to determine the effect of fiber reinforcement materials on the magnitude of stresses in a critical part of the maxillary denture base under thermal and occlusal load. Thermal stress analyses of the models were carried out using the finite element method. The models consisted of bone, soft tissue, interface gap, and maxillary dentures with and without reinforcements. A concentrated occlusal load of 230 N was applied bilaterally on the molar teeth. A 36 °C reference and 0 °C, 36 °C, and 70 °C variable ambient temperatures were applied to the models. CrCo, unidirectional and woven carbon/epoxy, unidirectional and woven glass/epoxy, and unidirectional and woven Kevlar/epoxy were used as reinforcing materials in the maxillary denture base made of PMMA (polymethyl methacrylate). Stress distributions on the maxillary denture’s midline and lateral line direction were evaluated. Maximum stresses in the incisal notch and the labial frenal notch of the maxillary denture were determined. Failure analysis of reinforcement materials used in maxillary dentures was carried out using the Tsai-Wu index criterion. The results obtained show that the thermal properties of reinforcement materials should be considered as an important criterion in their selection.
