The Hole Fracture Prediction of Circular Cup Drawing of Perforated Sheet SUS304 Stainless Metal

• Main Authors: Yu-Chao Lin, 林于超
• Other Authors: You-Min Huang
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/3fc929

碩士 === 國立臺灣科技大學 === 機械工程系 === 100 === Theories of this study combined Prandtl-Reuss flow rule with von Mises yield criterion and also used the analysis model by Slot and O'Donnell as a reference. In order to analyze the deformation behavior in the perforated hole sheet with a hexagonal holes, the shape function derived four-node quadrilateral degenerated shell element was applied to the stiffness matrices to constitute the finite element computed code. This study discussed circular hole deformation situation by perforated sheet circular cup drawing process. The deformed hole diameter and hole distance with drawing stroke length were used to predict the fracture condition. The research was conducted with software "PAM STAMP" to analyze the circular cup drawing process. The thickness of the specimen of tension test and the major and minor axis ratio during circular hole deformation to fracture were used as a fracture criterion. When it came to comparing the numerical analysis with experimental results, as the hole diameter and the hole distance increased, the stroke increased as well. If only the major axis and minor axis ratio had reached the fracture criterion but the thickness did not, then the hole would not fracture. This indicated the main effect on rupture was the thickness.