Development of a Nonlinear Inverse Finite Element Method in Strain Analysis of sheet metal forming

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Kangarani Farahani, Mohammad | 2011

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 42274 (08)
University: Sharif University of Technology
Department: Mechanical Engineering
Advisor(s): Assempour, Ahmad
Abstract:
An inverse finite element method (IFEM) has been developed for estimation of the blank size and prediction of the strain distribution in sheet metal forming. This approach deals with logarithmic large strains of membrane triangular elements, deformation theory of plasticity, virtual work principle and a new approach for friction modeling. This method leads to a system of nonlinear equations which is highly sensitive to the initial guess. In order to avoid the converging problems, especially in the quasi vertical walls, an appropriate initial guess is introduced. As well, the number of iterations in the nonlinear numerical solution is decreased by using this initial guess and the solution speed is significantly increased. The application to some problems shows good agreement with forward incremental method and experimental results
Keywords:
Metals Forming ; Inverse Finite Element Method ; Initial Blank Estimation ; Plasticity Deformation Theory

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