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Exploitation of static and dynamic methods for the analysis of the mechanical nanoproperties of polymethylmetacrylate by indentation
- Source :
- Frattura ed Integrità Strutturale, Vol 15, Iss 56, Pp 46-55 (2021)
- Publication Year :
- 2021
- Publisher :
- Gruppo Italiano Frattura, 2021.
-
Abstract
- Elaborating an instrumented nanoindentation is to exercise non-destructive tests to be applied to volumes of polymethylmetacrylate (PMMA) materials in miniature. This work focuses on factors that explain the trends variation of mechanical properties like Young's modulus (E), contact hardness (H) and indentation force (P). The evolution of E and H with depth (h) and P shows a 2.77 nm inflection point at low penetrations, separating two zones: the first increasing and the second decreasing. This is respectively explained by the surface hardening induced by preparing the material surface, and the existence of a surface hardness gradient denoted by an indentation size effect (ISE) observed at very low depths. Moreover, In addition, a critical penetration depth of 9.71 nm below which the surface effect dominates the variation of the penetrating load is detected. E and H results differences between dynamic and static modes are 8.46% and 6.44% inducing an overestimation of 35 MPa in E value, and an underestimation of 1.23 MPa in H value. This tends to affect the expected nanoscale precision of the indentation to determine the nanomechanical properties of PMMA.
Details
- Language :
- English
- ISSN :
- 19718993
- Volume :
- 15
- Issue :
- 56
- Database :
- Directory of Open Access Journals
- Journal :
- Frattura ed Integrità Strutturale
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.069ae98770f24ccbb636135aa061d319
- Document Type :
- article
- Full Text :
- https://doi.org/10.3221/IGF-ESIS.56.03