The discrepancy between the indentation curves obtained by the finite element method calculation with a Berkovich and a conical indenter

0565030 - ÚT 2023 RIV US eng J - Článek v odborném periodiku
Kovář, J. - Fuis, Vladimír - Čtvrtlík, Radim - Tomáštík, Jan
The discrepancy between the indentation curves obtained by the finite element method calculation with a Berkovich and a conical indenter.
Journal of Materials Research. Roč. 37, č. 10 (2022), s. 1750-1761. ISSN 0884-2914. E-ISSN 2044-5326
Grant CEP: GA TA ČR TN01000038
Institucionální podpora: RVO:61388998 ; RVO:68378271
Klíčová slova: nanoindentation * computing * elastic properties * fused silica * Ni
Obor OECD: Applied mechanics; Materials engineering (FZU-D)
Impakt faktor: 2.7, rok: 2022
Způsob publikování: Omezený přístup
https://link.springer.com/article/10.1557/s43578-022-00574-6

Nanoindentation is an experimental technique used for the determination of Young modulus. The commonly used Oliver-Pharr analysis based on the assumption of the equivalence of indentation curves obtained with a Berkovich and a conical indenter is employed. Nevertheless, a break-down of this equivalence in projected area between the pyramidal and conical geometry was found. This discrepancy leads to an overestimation of Young modulus and needs to be corrected with coefficient β. It corrects the difference between Young modulus from the conical and the Berkovich indentation but cannot correct the indentation curves. This paper aims at the FEM study of modelling of the nanoindentation test, the influence of the Oliver-Pharr analysis assumptions, the comparison and unification of the different values of β for the Berkovich and the conical indentation with a rigid and a diamond indenter, the correction of the indentation curves, and the explanation of the differences between the FEM calculated and experimentally measured indentation curves.
Trvalý link: https://hdl.handle.net/11104/0337616