| Zugriffsnummer | 15370 |
| Dokumenttyp | Konferenzartikel |
| Sprache | Englisch |
| Titel | Indentation velocity effect on Martens hardness measurement |
| Autor(in); Institution |
Herrmann, Konrad; 5.102, Härtemessung, PTB-Braunschweig
Menelao, Febo; 5.102, Härtemessung, PTB-Braunschweig
Germak, Alessandro; Istituto di Metrologia Gustavo Colonnetti (IMGC), Torino, ITALY
Barbato, Giulio; Politecnico di Torino, Torino, ITALY
Brondino, G.; Politecnico di Torino, Torino, ITALY
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| Quelle/Jahr | Joint International Conference IMEKO TC3/TC5/TC20 : proceedings of the International Conference on Force, Mass, Torque, Hardness and Civil Engineering Metrology in the age of globalization:(2002), 235 - 241 |
| Schriftenreihe | VDI-Berichte: 1685 |
| ISSN | 0083-5560 |
| ISBN | 3-18-091685-0 |
| Verlag | Düsseldorf: VDI-Verl. |
| Konferenzangaben | Joint international conference IMEKO TC3/TC5/TC20, Celle, 24-26, September, 2002, Germany |
| Freie Schlagworte | Martens hardness ; hardness measurement ; uncertainty in hardness measurement ; hardness standard machine ; hardness standardisation |
| Zusammenfassung | The indentation test in the micro- and nanorange is analysed for practical indentation velocities in the range between (2 ... 60 nm/s). This is one decisive peculiarity when measuring coated samples with a coating thickness d < 2 μm as compared with measurements in the macro range where typical indentation velocities are of the order > 1 μm/s. The influence of the indentation velocity vind for coated samples yields the largest relative changes of Martens hardness δHM for ductile materials with small coating thickness and for brittle materials with large coating thickness. In order to assure comparable measurement results of HM in the draft standard ISO/CD 14577-4 a range of indentation velocity vind = (10 ... 20) nm/s should be stipulated. The investigation of the effect of the indentation velocity on coated samples should be continued in the direction to reveal further influence quantities, like the indentation velocity in different parts of the indentation process. For the macro range a sensitivity to final velocity of indentation has been confirmed, but only for high hardness level. |
