Yazar "Misiolek, Wojciech" seçeneğine göre listele

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    Analysis of extrusion welding in magnesium alloys - numerical predictions and metallurgical verification
    (Elsevier Science Bv, 2014) Alharthi, Nabeel; Bingol, Sedat; Ventura, Anthony; Misiolek, Wojciech
    Solid-state bonding or extrusion welding takes place during hot extrusion of hollow shapes. The weld integrity is critical for mechanical performance of the produced profiles. To evaluate the weld integrity, a novel modeling method using DEFORM (TM) was proposed by Xu and Misiolek (2011) and modified in the present study. Metallurgical analysis of extruded magnesium alloy AM30 revealed two types of extrusion weld seams. The first seam type does not show a weld line which indicates perfect solid state bonding, and the second type contains a weld line, which could be a potential source of imperfections in the extrudate. (C) 2014 Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/).
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    Öğe
    Prediction of the True Stress of ZE20 Magnesium Alloy at Different Temperatures and Strain Rates
    (Assoc Mechanical Engineers Technicians Slovenia, 2015) Bingol, Sedat; Misiolek, Wojciech
    Compression tests were performed to obtain flow stress curves of a newly developed magnesium ZE20 alloy for automobile applications. The experiments were performed in a temperature range from 200 degrees C to 425 degrees C and the strain rates from 0.01 to 15 s-1 to examine the material responses at various processing conditions. Artificial neural network (ANN) and gene expressing programming (GEP) were used for the estimation of the true stress curves obtained from the experimental tests. Recently, a few studies were performed to estimate the true stress of different magnesium alloys by using ANN modelling method. However, this method has not yet been applied for the ZE20 alloy; therefore, it was the subject in this study. Furthermore, this study is the first attempt of using a GEP model to predict the true stress of a magnesium alloy. Both developed ANN and GEP models successfully predicted the true stress of ZE20 alloy.