Mechanical Engineering / Makina Mühendisliği

Permanent URI for this collectionhttps://hdl.handle.net/11147/4129

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Subject: search.filters.subject.Numerical simulationWoS Q: search.filters.wosQuartile.Q2

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  • Article
    Citation - WoS: 27
    Citation - Scopus: 30
    Single- and Double-Layer Aluminum Corrugated Core Sandwiches Under Quasi-Static and Dynamic Loadings
    (SAGE Publications Inc., 2016) Kılıçaslan, Cenk; Odacı, İsmet Kutlay; Güden, Mustafa
    The crushing of single- and double-layer zig-zag trapezoidal corrugated core sandwiches was investigated experimentally and numerically at quasi-static and dynamic rates. The buckling stress of sandwiches increased when the rate increased from quasi-static to dynamic. The increased buckling stresses were ascribed to the micro-inertial effects, which altered the buckling mode of the core from three plastic hinges to higher number of plastic hinge formations. The initial buckling stress was numerically shown to be imperfection sensitive when the imperfection size was comparable with the buckling length. The numerical buckling stresses of zig-zag and straight corrugated cores were similar, while higher inertial effects were found in triangular corrugated core.
  • Article
    Citation - WoS: 7
    Citation - Scopus: 7
    An Iterative Numerical Method for Determination of Temperature-Dependent Friction Coefficients in Thermomechanical Model Analysis of Cold Bolt Forging
    (Springer Verlag, 2013) İnce, Umut; Güden, Mustafa
    A set of temperature-dependent friction coefficients was developed to increase the accuracy of finite element (FE) simulations of cold bolt forging. The initially attained friction coefficients at different temperatures were calibrated with the iterations between the experimental and thermomechanical model extrusion test loads. The constant friction coefficient and the determined set of friction coefficients as function of temperature were then implemented to the simulations of the cold bolt-forging processes. Further calibrations and model validations were made based on the temperature measurements of the workpiece in the actual bolt-forging processes. To show the advantages of developed temperature-dependent friction coefficients, the loads of four different bolt-forging processes were compared with the thermomechanical model loads calculated using the constant friction and temperature-dependent friction coefficients. The modeling results indicated that the use of temperature-dependent friction coefficients in the FE simulations resulted in nearer temperature distributions and the loads of the workpiece during forging as compared with the use of a constant friction coefficient.