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    Comparation of failure criterions for pin loaded composite plates under fatigue loads
    (Sage Publications Ltd, 2025) Parlamis, Abdulkerim; Kaman, Mete Onur; Orcen, Gurbet; Albayrak, Mustafa; Erdem, Serkan
    In this study, the behavior of circular perforated and pin-loaded models of laminated composites under cyclic loads was obtained by progressive damage analysis. Experimental studies were also carried out to verify the numerical results the specimens. The strength and stiffness changes of the experimental specimens were obtained, and residual strength and stiffness graphs, which changed according to the number of cycles, were created. These parameters were used in the progressive damage analysis. In the numerical study, Hashin Damage Criterion was used for progressive damage analysis and the results were also compared with Puck Damage Criterion. Different damage criteria and problem types can be solved under fatigue load with the help of the subprogram written in ANSYS APDL. In this direction, after the verification of the numerical study with the experimental study, a parametric study was also carried out for the numerical analysis. At high cycle numbers for low loads in the experiments, crushing damage around the hole and shear damage at the plate edge became evident along with matrix damage. This damage behavior was consistent with the analyses performed with Puck. In the Hashin damage criterion, fiber compression damages were dominant, especially on the pin contact surface around the hole.
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    Experimental and numerical investigation of axial crushing behavior of hybrid sandwich pipes
    (Sage Publications Ltd, 2026) Kaman, Mete Onur; Erdem, Serkan; Albayrak, Mustafa; Gur, Mustafa; Asan, Ahmet Murat; Eroglu, Mehmet; Bozkurt, Ilyas
    This study presents an experimental and numerical investigation into the axial crushing performance of hybrid sandwich pipes designed for energy absorption applications. The aim is to enhance the specific energy absorption (SEA) characteristics of crashworthy structures while maintaining low weight, which is critical in transportation and aerospace industries. Hybrid specimens were fabricated by placing carbon fiber-reinforced polymer (CFRP) pipes inside aluminum tubes to create a sandwich configuration. Axial crushing tests were conducted to assess the energy absorption behavior, and the results were compared with those of full aluminum tubes. A finite element model was developed using LS-DYNA to simulate the progressive crushing behavior and validate the experimental findings. The numerical model incorporated the Johnson-Cook and Hashin failure criteria for the aluminum and composite materials, respectively. Results demonstrate that the hybrid sandwich structure significantly improves SEA compared to conventional aluminum tubes, indicating its potential for lightweight, high-performance energy absorbers in crash scenarios.
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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.