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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/27018


    Title: A variational upper-bound method for plane strain problems
    Authors: Yeh,WC;Yang,YS
    Contributors: 機械工程學系
    Keywords: N/A
    Date: 1996
    Issue Date: 2010-06-29 18:05:41 (UTC+8)
    Publisher: 中央大學
    Abstract: In this paper, a variational upper-bound (VUB) method is proposed. It is the method that determines an upper-bound solution using variational calculus. By using the method, a set of so-called ''naturally boundary conditions,'' which were all ignored in past investigations, can be theoretically derived for the rigid/plastic interface assumed to be arbitrary function in prior. This method is shown to be applicable to the cup ironing problem. From the result we can clearly indicate the role of these natural boundary conditions which reasonably account for the effect of friction on the pattern of metal flow. The VUB method not only presents an improvement on the traditional upper-bound method, but also favorably agrees with experimental result of Nielsen et al. (1963) in calculating upper-bound energy.
    Relation: JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING-TRANSACTIONS OF THE ASME
    Appears in Collections:[Graduate Institute of Mechanical Engineering] journal & Dissertation

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