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Constitutive parameter optimisation using metal forming experiment and finite element analysis
2001 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The aim is to investigate a method for optimising parameters in a constitutive model of steel. The obtained parameters should be possible to use as input in a metal forming simulation using the finite element method (FEM). A simple forming experiment is carried out. The experimental output, tool force and displacement, is compared with the same calculated output from a finite element analysis modelling the experimental set-up. The comparison is made using two inverse modelling procedures, yielding two sets of optimised material parameters as output. The parameters obtained are compared with standard tensile test data in an industrially applied simulation of a forming process. It is found that a set of parameters where the flow stress in the constitutive model of the material is optimised using a power function, relating one hundred predefined values of plastic strain to the flow stress, gives the best fit to experimental data. In the applied simulation both sets of parameters resulted in lower calculated press force compared with the use of tensile test parameters. The different optimisation results for the two parameter sets is mainly due to the choice of method to generate the flow stress curve. The methodology of using an initial simple forming experiment combined with an inverse modelling procedure show potential to generate more relevant results than the use of a tensile test. Especially in the early stages of a simulation process where prototype tools are not present for verification of simulation results. It is concluded that the method used here is mostly encouraging but further development is necessary, for example regarding the experimental design.

Place, publisher, year, edition, pages
Keyword [en]
Technology, Metal forming, Inverse modelling, Optimising, Constitutive model, Simulations, Finite element method
Keyword [sv]
URN: urn:nbn:se:ltu:diva-59242ISRN: LTU-EX--01/307--SELocal ID: fc4b3920-a7a4-4e94-9660-e360c801787eOAI: diva2:1032630
Subject / course
Student thesis, at least 30 credits
Educational program
Engineering Physics, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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