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A method to obtain macroscopic plastic strain values with Electron Backscatter Diffraction data and a comparison with FEM

Ripandelli, Remy (2018) A method to obtain macroscopic plastic strain values with Electron Backscatter Diffraction data and a comparison with FEM. Master's Thesis / Essay, Applied Physics.

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Abstract

In this study EBSD scanned misorientations of a highly deformed ferritic metal was used to calculate quantitative macroscopic plastic strain values using a statistical approach. By using EBSD measurements on tensile test samples, a correlation between the misorientation values and macroscopic plastic strain was found. Misorientation values measured on various highly deformed bent samples were translated in macroscopic plastic strain values using the correlation equation. The bent samples were simulated with a finite element model and the experimental values agreed very well with the computed data. Furthermore an attempt was made to calculate the microscopic misorientation data with a very simplified dislocation density model which treats all misorientation values as measures for glide dislocations. The resulting microscopic strain values obtained were in the order of 101. This approach was too straight forward because misorientations result from a very complex interaction of different kind of dislocations. It was therefore rejected. Finally a study of the reliability of the used equipment was done in the form of a gage repeat and reproducibility study which revealed a total relative error of misorientations that did not exceed 0.8 %.

Item Type: Thesis (Master's Thesis / Essay)
Supervisor:
Supervisor nameSupervisor E mail
Hosson, J.T.M. deJ.T.M.de.Hosson@rug.nl
Degree programme: Applied Physics
Thesis type: Master's Thesis / Essay
Language: English
Date Deposited: 06 Sep 2018
Last Modified: 07 Sep 2018 14:51
URI: http://fse.studenttheses.ub.rug.nl/id/eprint/18527

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