Application of a generalised upper bound analysis in extrusion of asi-symmetric bi-metallic tubes

• Main Authors: Jun-Hong Huang, 黃濬泓
• Other Authors: Wei-Ching Yeh
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/86761317947759785607

碩士 === 國立中央大學 === 機械工程研究所 === 93 === 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.