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    Fracture behavior of cracked composite plates repaired with a patch under various loading conditions
    (Springer India, 2025) Durmus, Hatice; Kaman, Mete Onur; Yanen, Cenk; Albayrak, Mustafa
    This study examines the mechanical behavior of patch-repaired composite plates under mixed-mode loading using the Arcan test method. The experimental study determines the effect of crack, patch length, and loading angle on the plate damage load. The energy release rates were determined by the virtual crack closure technique, and the fracture toughness of the repaired composites was calculated with finite element analysis. The study revealed that the maximum damage load of repaired plates under Mode-I loading was 5.95% higher than mixed-mode. Additionally, bearing damage occurred due to overload in the bolt holes caused by the high strength.
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    Investigation of mechanical behavior of reinforced u-profile composites under low velocity impact
    (2024) Albayrak, Mustafa; Turan, Kadir; Kaman, Mete Onur; Yanen, Cenk; Erdem, Serkan; Uslu, Merve; Dag, Serkan
    In this study, the impact resistance of reinforced composite panels with unsupported, and U profile supported by I profile was numerically examined. For this purpose, firstly, unsupported glass fiber/epoxy composite panels were designed, and then I-profile composite supports were added to these panels. The impact strength, and damage behavior of supported, and unsupported specimens under low-velocity impact were compared numerically. In the analysis, the MAT22 material card, also known as the Chang-Chang damage model for composite material, was used in the LS-DYNA program. As a result of the analysis, maximum damage load of the unsupported specimen is determined to be approximately 294 N. It was determined that by adding an I profile to the structure, the maximum damage load increased to 543 N. It was seen that the added I profile supports increased the maximum contact force of the composite structure by approximately 85%. Fiber breakage damages were observed in both supported, and unsupported specimens. However, with the use of I profile support, the damaged area was further reduced. It has been determined that under low-velocity impact, supported specimens exhibit more rigid material behavior than unsupported specimens.
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    Investigation of the mechanical response of laminated composites reinforced with different type wire mesh
    (Springer Heidelberg, 2023) Alev, Kubranur Isgor; Kaman, Mete Onur; Albayrak, Mustafa; Yanen, Cenk
    In this study, the mechanical behavior of laminated glass fiber composite plates reinforced with wire meshes under in-plane and out-of-plane loads was investigated. For this purpose, composite plates were produced by vacuum infusion method by placing aluminum and glass fiber wire layers with different mesh numbers between woven glass fiber fabrics. Afterward, impact and tensile tests were applied to the obtained specimens, respectively. The effect of the added reinforcement wires meshes on the impact resistance and tensile strength of the composites was determined. According to the data obtained; When glass wire with the same mesh number is used, 19.2% more reaction force was obtained than aluminum wire. The results of the double cantilever beam (DCB) and end notched flexure (ENF) test results confirmed that glass wire meshes had a better adhesion surface compared to aluminum. In addition, critical energy release rates were obtained with the help of the ANSYS & REG; finite element program and the data were compared with the experimental results. In the case of increasing the mesh number, it was observed that the reaction force of the glass wire mesh reinforced composite decreased by 17.54% under the impact. It was determined by scanning electron microscope (SEM) images that this decrease in the reaction force occurred due to the matrix material contacting the interlayer adhesion surfaces to a lesser extent. One layer of wire mesh reinforcement had no significant effect on the tensile strength of the glass fiber composite.