توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Prediction of Temperature Distribution during Semi–Solid Forward Extrusion by Using Finite Volume Method
نویسنده(ها): ، ،
اطلاعات انتشار: اولین کنفرانس بین المللی و هفتمین کنفرانس ملی مهندسی ساخت و تولید، سال
تعداد صفحات: ۹
Today the development of innovative production technologies has became a major factor in global competition. One of these innovative production technologies in metal forming field is semi–solid forming (SSF). Especially for metals that are difficult to process with conventional technologies, semi–solid metal forming offers the possibility of significant gains in product quality and productivity of the forming process. In current study, one of the most conventional procedures between semi–solid forming processes, i.e. thixo forward extrusion, has been analyzed. In fact this process has been simulated by using the SupperForge software that is based on the finite volume method. As one of the purposed results of simulation, temperature distribution in whole workpiece at different steps of forming process has been studied. Based on simulated process results, temperature distribution can be influenced by different process parameters including on extrusion ratio, die angle and punch velocity.<\div>

۲Three Dimensional Finite Element Analyses to Investigate the Impact of Tunneling on Pile
نویسنده(ها): ،
اطلاعات انتشار: اولین کنفرانس ملی مهندسی ژئوتکنیک، سال
تعداد صفحات: ۱۲
Tunnels are an integral part of the infrastructure of modern society and are used for a wide range of applications,including subways and railways, highways, material storage, and sewage and water transport. On the other hand, inurban area many of the surface structures are supported by piled foundations. Thus, tunneling–induced groundmovements may cause serious damage to the adjacent piles. Several researchers conducted two–dimensional laboratory tests and centrifuge model tests and presented closed–form analytical solution for the preliminary design purpose. In this paper, a series of finite element simulations were performed to investigate the influence of tunneling on adjacent piles. Results of three–dimensional numerical analysis show that, although there is a good agreement between finite element method and closed–form analytical solution when the tunnel lining is located (installed) at the pile level, magnitude of internal forces and displacement imposed on pile due to the tunneling increase significantly even after the passage of tunnel face from the pile.<\div>
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