Study on Forming Limit of Tubes

• Main Authors: Jui-Chang Lin, 林瑞彰
• Other Authors: Yeong-Maw Hwang
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/76559385118188574589

碩士 === 國立中山大學 === 機械與機電工程學系研究所 === 91 === ABSTRACT The objective of this study is to establish the Forming Limit Diagram (FLD) of tubes. An experimental system of tube hydroforming, the electrical chemical etching method and the image process system are used to carry out the sheet metal forming test and the hydraulic bulge-forming test of annealed aluminum alloy tubes. Furthermore, Hill’s new yield criterion is also used to predict the Forming Limit Curves of sheets. The predicted forming limit diagrams are compared with experimental data. The forming limit diagrams of tubes are coincident with those of sheets. Also, the predicted forming limit curves by Hill’s new yield criterion agree quite well with those by experiments. Therefore, Hill’s new yield criterion can be used to establish the forming limit curves of sheets or tubes.