Volumes sampled for hardness and for modulus of elasticity during nanoindentation testing

dc.contributor.authorKashani, Mahdi Saket
dc.contributor.authorGilvan, Akbar Aftabi
dc.contributor.authorMadhavan, Viswanathan
dc.descriptionClick on the DOI link below to access the article (may not be free).en_US
dc.description.abstractIn this article, the sizes of the volumes sampled by nanoindentation tests for hardness and modulus measurements are studied using finite element simulations. The zones of influence for hardness and modulus in single-phase systems are determined by modeling a hemispherical particle in a matrix, with properties close to those of each other, and monitoring the deviation of the measured values from those of the particle. It is found that, for hardness testing of elastic-perfectly plastic materials, the intrinsic hardness of the particle is measured as long as the plastic region is still within the particle, i.e., the contact radius is one half or less of the particle radius. Thus, in a hardness test of a single-phase material, all of the plastically deforming material, and only the plastically deforming material, contributes to the hardness measured. In contrast, the zone influencing the modulus is not restricted to a specific volume near the indenter. The modulus measured from the elastic response at the indentation point is dependent upon the entire specimen. A relationship is developed to describe the observed behavior of the measured modulus, that holds true for both sink-in and pile-up material behavior and for different indenter cone angles.en_US
dc.description.versionPeer reviewed
dc.identifier.citationMahdi Saket Kashani, Akbar Aftabi Gilvan and Vis Madhavan (2012). Volumes sampled for hardness and for modulus of elasticity during nanoindentation testing. Journal of Materials Research, 27 , pp 1553-1564 doi:10.1557/jmr.2012.107en_US
dc.identifier.otherWOS: 000304916800002
dc.publisherCambridge University Pressen_US
dc.relation.ispartofseriesJournal of Materials Research;2012, V.27, No.12
dc.rights.holderCopyright © Materials Research Society 2012
dc.subjectElastic propertiesen_US
dc.subject.classificationMATERIAL SCIENCE
dc.titleVolumes sampled for hardness and for modulus of elasticity during nanoindentation testingen_US