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    Mechanical characterization of lattice structure produced by additive manufacturing under torsion and compression
    (Sage Publications Ltd, 2024) Akbay, Ozgun Ceren; Ozdemir, Burak; Bahce, Erkan; Emir, Ender; Uysal, Mine Uslu
    In the present paper, the torsion and compression behaviors of lattice structures were studied. The PLA (Polylactic Acid) materials were used in assembly and produced by additive manufacturing method. The structure and lattice behaviors were investigated by Digital Image Correlation (DIC) system during experimental study. Models created using three different unit cell model as Trunch Octa Dense, Trunch Octa Light, Body Diagonals With Nodes and two different, 70 mm and 140 mm, total length size. The influence of the unit cell model, cell size on the strength of the structure were studied by compression and torsion experiments. The maximum compressive stress and maximum torsion were obtained and their deformations were presented. The highest maximum torque was determined in Body Diagonals With Nodes cell model and 140 mm due to the fact that the cell model structure compatible with torsion. The highest compressive stress was determined in Trunch Octa Light cell model and 140 mm cell length. Graphical Abstract
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    Production and Cleaning of Lattice Structures Used in the Space and Aerospace Industry with Metal Additive Manufacturing Method
    (Springer, 2022) Akbay, Ozgun Ceren; Bahce, Erkan; Uysal, Alper; Gezer, Ibrahim
    Thanks to additive manufacturing, the use of lattice structures in aviation and space industry, especially heat exchangers, fuel nozzles and turbo machines located at the front of airplanes has increased. The production of computer-designed parts with the desired precision and geometry is important for concepts such as assembly, wear and surface properties. Problems encountered in selective laser melting (SLM) such as porosity, powder particle adhesions, affect assembly and surface properties. For this reason, cleaning is inevitable in sensitive systems used in the aerospace industry to have ready-to-use products after production or to prevent dust particles from breaking and causing problems in the workflow. To this purpose, chemical washing process was applied to improve the surface quality of the lattice structures and the healing effects of the acids used on the surfaces were investigated. In the experiment, nine lattice structures were produced from CoCr alloy and the effects of three different acid solutions prepared using hydrofluoric acid, nitric acid, sulfuric acid and hydrochloric acid on surface cleaning capacity were examined. The changes in the models immersed in the acid solution using the controlled immersion method for 180 seconds are presented comparatively. As a result of the experiment, it was seen that especially the solution containing hydrofluoric acid contributed to the improvement of the surface properties after production.