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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/2507

    Title: 以上界限法分析雙金屬中空管擠製;Application of a generalised upper bound analysis in extrusion of asi-symmetric bi-metallic tubes
    Authors: 黃濬泓;Jun-Hong Huang
    Contributors: 機械工程研究所
    Keywords: 上界限法;雙金屬;流線函數;bi-metallic;upper bound method;stream funcion
    Date: 2005-07-07
    Issue Date: 2009-09-21 11:48:50 (UTC+8)
    Publisher: 國立中央大學圖書館
    Abstract: 本文目的在利用Hwang[22]所提出的流線函數,來解析雙金屬中空擠製加工,以建構複合材對擠製問題的上界限解析模式。首先利用塑性不可壓縮定理,求取在環狀襯套及蕊材進、出口端之剛塑界面函數,並以上界限理論進而求得擠製消耗總功率,本文數值分析係利用IMSL[10]最佳化程式〝NCONF〞以求得上界限解,將其解與Chitkara[6]所提出的理論、實驗加以比對和驗証,進而探討直線模、曲線模擠製加工的面積減縮率、半模角及摩擦因子等條件對擠製壓力與出口端半徑比之關係。 The purpose of this investigation is to discuss bi-material tubes extrusion using Hwang[22] proposed stream fuction. Building a model of bi-material upper bound method for extrsion problem. First, using incompressible plastic method to obtain sleeve layer and core layer of rigid/plastic interface fuction, by using upper bound method obtain extrusion of the total power. This investigation is number solution analyse utilize IMSL optimization procedure NCONF to request upper-bound solutin, The solution with Chitkarara[6] proposed theory and experiment prove. Discuss line die and curve die is reduction of area ,the friction factor, the semi-die angle and ect. to counter to with the effect of extrusion pressure and final radius ratio.
    Appears in Collections:[機械工程研究所] 博碩士論文

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