| Summary: | 碩士 === 國立勤益科技大學 === 機械工程系 === 98 === The purpose of this study is to analysis the process conditions of the radial compression of metal tube. The methodology of elasto-plastic three-dimensional incremental finite element model is based on updated Lagrangian formulation (ULF). It associated Prandtl-Reuss flow rule and Hill’s yield criterion respectively. In particular, selective reduced integration was adopted to formulate the stiffness matrix. The extended r-minimum technique was used to deal with the elasto-plastic state and contact problems at the tool-metal interface.We focus on the influence of parameters of process on the radial compression of aluminum tube. Simulation results contain the whole deformation history, the relationship between punch load and punch stroke, stress and strain during the compression process were obtained, the thickness of workpiece, buckling ratio on the rim and middle and axial collapse value. In addition, put into analysis of clad tube process. Besides using the above finite element code for analysis, JIS A1050-H18 Aluminum Tubes is selected for experiment. This will serve as reference for further research on micro deep drawing.Finally, A series of simulations were performed to validate the formulation in the theory, leading to the development of the computer codes. The whole deformation history and the distribution of stress and strain during the forming process were obtained by carefully considering the moving boundary condition in the Finite Element Analysis (FEA). Results in this study clearly demonstrated that the computer code for simulating the square-rail drawing process was efficient.
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