Enhancing the information content of Berkovich nanoindentation testing to extract slip system interaction coefficients from residual topographies and crystal lattice rotations on FCC crystal using inverse method
Résumé
The present study therefore aim to design future experiments to identify crystal plasticity parameters, including interaction coefficients, while seeking enhanced conditioning of the inverse problem compared to our previous study [5]. The key design parameter is the information content of Berkovich nanoindentation observables and their combinations. The information content is quantified through an identifiability analysis of the targeted crystal plasticity parameters based on the observables and their combinations, using a reference parameter set established in [5]. This study evaluates the identifiability of observables obtained both beneath the surface (crystal lattice rotation) and on the surface (residual topographies) after the nanoindentation test, as well as their combine use. Berkovich nanoindentation simulations and experiments are carried out on single crystal nickel samples. A set of 13 orientations, chosen to discretize the inverse pole figure, will be investigated. Finally, by exploring the database of observables across 13 orientations, the optimal set of experiments will be determined.
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