Genetic Programming and FEM simulation for a microscopic residual stress description in polycrystals using neutron diffraction and EBSD data
Résumé
The detailed description of the residual stress fields in metallic polycrystals from the macro to the microscale is a problem of formidable complexity. This is mainly due to experimental limitations of diffractions tools and conventional analytical methods. Another key aspect that complicates the problem further is the possible generation of dislocation structures associated with the microscopic intergranular stresses in the polycrystal. This multi-scale nature of the dislocation structures and the present experimental and analytical limitations has suggested us to combine different tools to connect the residual stresses with the microstructure of the material at the different scales. In this work, Genetic Programming, GP, and finite element methods, FEM, simulations have been used to describe the intergranular residual stresses (those among individual grains) developed from a quenching step (axial component) in a polycrystalline 5083 aluminium alloy sample and their connection with the microstructure of the alloy. The computer tools make use of neutron diffraction and EBSD data as the experimental input information from the material´s microstructure.
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