Issue 19

L. Susmel et alii, Frattura ed Integrità Strutturale, 19 (2012) 37-50; DOI: 10.3221/IGF-ESIS.19.04 45 Materiale Scala Carico HV Errore Calcolata Misurata [mN] [GPa] [GPa] [%] Al 7075-T6 Macro 490000 1.84 1.88 2.2 196000 1.83 1.86 1.6 98000 1.87 1.89 1.1 Micro 9800 1.75 1.83 4.6 4900 1.75 1.83 4.6 980 1.59 1.76 10.7 490 1.75 2.01 14.9 245 1.77 2.08 17.5 Nano 98 1.89 2.07 9.5 49 2.07 2.16 4.3 9.8 2.14 2.37 10.7 4.9 2.09 2.5 19.6 0.98 2.13 2.92 37.1 0.49 2.14 3.25 51.9 BS970-En3B Macro 490000 2.07 2.11 1.9 196000 2.08 2.12 1.9 98000 2.08 2.07 -0.5 Micro 9800 1.97 2.01 2.0 4900 2.09 2.04 -2.4 980 1.99 2.05 3.0 490 2.25 2.36 4.9 245 2.5 2.63 5.2 Nano 98 2.65 2.8 5.7 49 2.7 2.85 5.6 9.8 2.75 2.87 4.4 4.9 2.94 3.04 3.4 0.98 3.04 3.15 3.6 0.49 3.08 3.34 8.4 AISI 316L Macro 490000 1.83 1.87 2.2 196000 1.83 1.86 1.6 98000 1.84 1.87 1.6 Micro 9800 1.75 1.84 5.1 4900 1.75 1.79 2.3 980 1.75 1.93 10.3 490 1.84 1.77 -3.8 245 1.88 2.22 18.1 Nano 98 2.18 2.41 10.6 49 2.18 2.58 18.3 9.8 2.18 2.59 18.8 4.9 2.19 3.32 51.6 0.98 2.22 3.63 63.5 0.49 2.2 3.75 70.5 Tabella 3 : Comparazione tra i valori di durezza HV ottenuti sperimentalmente e quelli ottenuti mediante analisi numeriche agli elementi finiti. Table 3 : Comparison between the experimental values of the Vickers hardness and the corresponding values determined by solving elasto-plastic FE models.