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    Comparison of mechanical properties of samples fabricated by stereolithography and fused deposition modelling
    (2023) Bayraklılar, Mehmed Said; Buldu, Abdulkadir; Koçak, Muhammed Tayyip; Ülkir, Osman; Kuncan, Melih
    Additive manufacturing (AM) technology has attracted significant attention with the rapid fabrication of 3D parts for various applications. The two most popular techniques in this technology, Fused Deposition Modelling (FDM) and Stereolithography (SLA), make it possible to produce functional parts with complex shapes quickly and cheaply. Determining the mechanical properties of the parts fabricated by these methods is important in terms of efficient operation in the relevant fields. In this study, forty-five test specimens were fabricated using three different polymer materials (UVR, PLA, and ABS) in SLA and FDM type 3D printers, including tensile, compression, and 3-point bending tests. Samples are printed at a 75% fill rate according to ASTM standards. Experimental studies were carried out to determine the mechanical properties of the samples. Among the samples, the highest strength values in tensile, compression and bending test samples made of UVR material were 60.39 MPa, 127.74 MPa and 118.35 MPa, respectively. In addition to mechanical properties, hardness, and SEM analyses were performed to examine the surface roughness, surface topography, and composition of the samples.
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    Material selection for artificial femur bone using PROMETHEE-GAIA method
    (American Society for Testing and Materials, 2024) Koçak, Muhammed Tayyip; Bayraklılar, Mehmed Said; Kuncan, Melih
    When replacing bones and implants, choosing the right materials for the artificial bone and orthopedic implants is crucial to the procedure’s success. In this work, a thorough assessment of the literature was followed by a thorough and rigorous evaluation of prospective materials for prosthetic femurs using a multicriteria decision-making process known as PROMETHEE-GAIA (Preference Ranking Organization METHod for Enrichment Evaluation and Geometric Analysis for Interactive Assistance). The proposed approach was validated using a total of 12 assessment parameters, including density, tensile strength, and ultimate tensile strength, and 17 candidate materials. The significance of the chosen criteria is well described. These 17 candidate implant materials and the 12 assessment criteria were used to develop a choice matrix. Rankings over the prepared matrix were produced using the PROMETHEE-GAIA program. Ti-6Al-7Nb, Ti-6Al-4V, and ASTM F1537, Standard Specification for Wrought Cobalt-28Chromium-6Molybdenum Alloys for Surgical Implants (UNS R31537, UNS R31538, and UNS R31539), Co-Cr-W emerged as the top contenders and were demonstrated as possible materials for effective artificial femur materials because of the assessment. With a large number of pertinent criteria and a wide range of materials, this study offers a framework for the selection of implant materials. It also emphasizes how choosing materials carefully may increase the durability and efficiency of orthopedic implants.