Identification of elastic material parameters from experimental kinematic fields
Chiara Rossi
Identification of elastic material parameters from experimental kinematic fields.
Rel. Alberto Cina. Politecnico di Torino, Corso di laurea magistrale in Ingegneria Civile, 2020
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Abstract
The aim of this thesis is to find the mechanical properties of a non-homogeneous material in the hypothesis of elastic behaviour. To overcome the problems of conventional testing, in which the macroscopic properties are determined, and identify the real Poisson’ s ratio of a material, the spatial distribution of dis-placements has been measured. To obtain, what is called, a displacement field, Digital Image Correlation (DVC), is used. Thanks to the DVC it has been possible to obtain displacement field measurements from a 3D image series (from initial to deformed), results of a test.The 3D images treated in this thesis are either synthetically generated, or as a result of x-ray tomography on a real experiment.In both cases the initial configuration of the specimens has been chosen with increasingly complicated morphologies.
Starting from the homogeneous configuration, up to a specimen with many void spherical defects.In the synthetic case, once the image of the initial configuration is generated, it is deformed with a displacement field resulting from a Finite Element simulation.In the case where the campaign of experiments is carried out once the material has been chosen with the desired configuration, the images are obtained thanks to in-situ tomography, combining x-ray tomography and uniaxial compression testing
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