Displacement Identification of Torch Heated Plate Structure Using Thermo-Elasto-Plastic Strip Model

• Main Authors: C.C.Chen, 陳慶棋
• Other Authors: S.T.Jeng
• Format: Others
• Language: zh-TW
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/67523541084673789813

碩士 === 國立成功大學 === 航空太空工程學系 === 88 === The purpose of the thesis is to study the thermo-elasto-plastic deformation response of a steel plate subject to hot working forming process. In order to reduce a large amount of time to compute thermo elastro-plastic problem, we utilize a simplified model to relate heating effect into the equivalent shrinkage force and bending moment, then take finite element method (FEM) to solve the deflection of plate. There are two parameters of the model needed to be identified, we adopt genetic algorithms (GAs) to search the optimal parameters on the basis of experiment’s result. For seeking the parameters, we construct and combine finite element program and GAs program, then use numerical simulation to test the robust of GAs and induce the application range of GAs subject to thermo elasti-plastic model. We conclude that it exists 29% error compared with experiment’s result. GAs is a time-consuming optimization tool. In order to decrease computational time, we introduce the method of effective stiffness and effective load and prove its validity when performing FEM in GAs.