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نویسندگان مقالات پربازدید :
مواد و طراحی
جزئیات رویداد
همایش ، رویداد ، ژورنال
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  • fracture in bending – the straining limits of monolithic sheets and machined tailor-made blanks

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    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 447
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     this paper studies fracture in the bending of monolithic sheets and machined tailor-made blanks made of high strength aluminum alloys commonly used in the aircraft industry as well as the effects of sheet thickness and thickness difference on their forming limits. tailor-made blanks (tmbs) are sheet metal assemblies that are composed of sheets with different thicknesses and/or materials. machining is among the techniques that can be used for creation of the needed thickness variations and is the one that is studied in this paper, because it isolates the effects of thickness difference from those of the welding/joining process. the selected materials are 2024-t3 and 7075-t6 representing 2000 and 7000 series aluminum alloys. two sets of experiments are carried out to identify the effects of sheet thickness and thickness difference on the forming behavior of the selected alloys. the first set of the experiments is tensile testing. the tensile properties of sheets with different thickness and thickness ratios including the plasticity parameters are determined in the first set of experiments. the second set of the experiments is air bending. the minimum bending radii of materials with different thicknesses and thickness ratios are determined in the second set of experiments. then, the forming limits are determined using a theoretical approach and the experimentally-determined forming limits are compared with the theoretically-determined ones. the results of the tensile testing and air bending are studied both separately and in comparison with each other to identify the trends and to understand the mechanisms governing the observed trends. it is shown that the minimum bending ratio increases as the sheet thickness increases and that the minimum bending radius slightly (10–12%) increases as the thickness ratio increases from 1 to 2.

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