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    Fatigue fracture analysis of the semi-auto shotgun mechanism by using finite element analysis and experimental setup
    (Pergamon-Elsevier Science Ltd, 2020) Sen, Yaşar
    In this study, fatigue fracture behavior of locking part specimens was investigated. An evaluation of the fractured locking block has been undertaken in order to assess its integrity which included a visual inspection, chemical and metallurgical analysis, hardness measurements and examination of fracture surface. Pro/Engineer software was used to modeling of locking part. The finite element code ANSYS/LS-DYNA and ANSYS Workbench is used to determine the stress distributions and fatigue behavior of the locking block, respectively. This study indicates that the fracture of the locking block occurred because of fatigue. Besides, SEM observations show that there is a cavity inside the materials. These cavities reduced the fatigue life of the locking block.
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    Investigation for the Effects of Newly Designed Hip Prosthesis on Crack Propagation Using Probabilistic Methodology
    (Amer Scientific Publishers, 2020) Sen, Yaşar
    In orthopedic prosthesis design, finite element method is one of the commonly used mathematical methods for performing structural analyzes and reducing test costs before it is applied to the patient. Surgeons and engineers should work together to design reliable durable and hip replacement. Desirable functional requirements for prosthesis design include high fatigue life, small relative displacement between the prosthesis-cement interface, and reduced stress on the bone and prosthesis. For this purpose, the progression of the fracture was calculated by applying the scenario of the presence of crack in the bone cement of the designed prosthesis using optimization methodology. The same conditions were analyzed in commercially available Charnley type prosthesis and the results were compared. When the obtained results are examined, it is seen that the newly designed prosthesis is more effective than the Charnley type prosthesis.