caa a22 4500 388022612 CHVBK 20180307124928.0 cr unu---uuuuu 161130e199805 xx s 000 0 eng 10.1557/JMR.1998.0197 doi S0884291400044332 pii (NATIONALLICENCE)cambridge-10.1557/JMR.1998.0197 Continuous measurements of load-penetration curves with spherical microindenters and the estimation of mechanical properties [Elektronische Daten] Elastic and plastic properties of metals and Young's modulus of ceramics are determined in the microindentation regime by continuous measurements of load versus depth of penetration with spherical indenters. Calibration procedures, usually applied in nanoindentation experiments, are not needed in the microregime where spherical indenters (rather than sharp indenters with microscopical spherical tips) can be manufactured. As indenters of larger diameters are used, the elastic response of the specimen can be probed during the loading stage of the indentation tests (and not only during unloading, as is the case with nanoindenters). Hence, an accurate determination of Young's modulus can be achieved without a prior knowledge of possible "piling up” or "sinking in” which may occur at the perimeter of the contact area. The contact response of materials is shown to undergo four distinct regions: (i) pre-Hertzian regime, (ii) Hertzian regime, (iii) small-scale plasticity, and (iv) large-scale plasticity. A general methodology for estimation of yield strength and hardening exponent of metals is proposed in the last regime. Copyright © Materials Research Society 1998 Alcalá J. Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 Giannakopoulos A. E. Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 Suresh S. Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 Journal of Materials Research Cambridge University Press 13/5(1998-05), 1390-1400 0884-2914 13:5<1390 1998 13 JMR https://doi.org/10.1557/JMR.1998.0197 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1557/JMR.1998.0197 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Alcalá J. Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 NATIONALLICENCE 700 1- Giannakopoulos A. E. Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 NATIONALLICENCE 700 1- Suresh S. Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 NATIONALLICENCE 773 0- Journal of Materials Research Cambridge University Press 13/5(1998-05), 1390-1400 0884-2914 13:5<1390 1998 13 JMR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge