Identifiability of single crystal plasticity parameters from residual topographies in Berkovich nanoindentation on FCC nickel - Archive ouverte HAL
Article Dans Une Revue Journal of the Mechanics and Physics of Solids Année : 2020

Identifiability of single crystal plasticity parameters from residual topographies in Berkovich nanoindentation on FCC nickel

Résumé

The information richness of imprints topographies obtained after Berkovich nanoindenta- tion tests at grain scale is assessed for identifying all or part of the parameters of a sin- gle crystal plasticity law. In a previous paper (Renner et al., 2016), the strong potential of imprints topographies has been shown through a large experimental campaign con- ducted on nickel samples. A 3D crystal plasticity finite element modelling (CPFEM) of the nanoindentation experiment using the Méric-Cailletaud has also showed a large sensitivity of residual topographies to the indenter/grain orientation and to the plastic parameters, including the interaction matrix coefficients specifying the interactions between disloca- tions on different slip systems. This makes imprints topographies very good candidates to provide information for the single crystal parameters identification. The present paper fo- cuses on the Méric-Cailletaud law parameters identifiability using residual topographies. A method is built to define the best well-posed inverse problem to ensure the parame- ters identification using a crystal plasticity finite element modelling updating (CPFEMU) method. An identifiability index proposed by Richard et al. (Richard et al., 2013) for mea- suring the information richness of the indentation curve is extended to the analysis of residual topographies. This index quantifies the possibility to achieve a stable/unstable so- lution using an inverse method. For the studied behaviour, the results show that eight of the nine Méric-Cailletaud law parameters can be identified using three topographies.
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Dates et versions

hal-02980605 , version 1 (27-10-2020)

Identifiants

Citer

Emile Renner, Alexandre Bourceret, Yves Gaillard, Fabien Amiot, Patrick Delobelle, et al.. Identifiability of single crystal plasticity parameters from residual topographies in Berkovich nanoindentation on FCC nickel. Journal of the Mechanics and Physics of Solids, 2020, 138, pp.103916 (20). ⟨10.1016/j.jmps.2020.103916⟩. ⟨hal-02980605⟩
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