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The use of Knoop indentation for the assessment of the plastic properties of mortars and natural stones

dc.creatorAthanasiou V., Papamichos E., Giannakopoulos A.E.en
dc.date.accessioned2023-01-31T07:34:08Z
dc.date.available2023-01-31T07:34:08Z
dc.date.issued2017
dc.identifier10.1016/j.ijrmms.2016.11.010
dc.identifier.issn13651609
dc.identifier.urihttp://hdl.handle.net/11615/70933
dc.description.abstractThe present work investigates the Knoop hardness of rocks and other pressure sensitive materials. We tested ten different types of rocks, a cement paste, and PMMA. We also analyzed existing experimental results for Mg-PSZ (magnesia-partially stabilized zirconia) and Pb40Ni40P20 metal glass. We performed finite element indentation analysis for three types of material models: Mohr-Coulomb (associative), Drucker Prager (associative and non-associative), and foam-type. The material models assumed isotropic elasticity (with low elastic strains) and no strain-hardening effects. We compared our analytical results with our experimental results using material data from the literature. We found that different materials can be best described by either the Mohr-Coulomb or Drucker-Prager models. Highly porous materials showed unreasonably high Knoop hardness, raising questions on how their surface can be prepared for indentation tests. Materials with known model types such as cement, PMMA, Mg-PSZ and metal glass, verified our analytical results. © 2017 Elsevier Ltden
dc.language.isoenen
dc.sourceInternational Journal of Rock Mechanics and Mining Sciencesen
dc.source.urihttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85011291954&doi=10.1016%2fj.ijrmms.2016.11.010&partnerID=40&md5=5af81f575682b1e9fa70480ba0a96bfb
dc.subjectCementsen
dc.subjectCeramic materialsen
dc.subjectGlassen
dc.subjectHardnessen
dc.subjectLead compoundsen
dc.subjectMagnesiaen
dc.subjectMagnesium compoundsen
dc.subjectNickel compoundsen
dc.subjectPorous materialsen
dc.subjectStrainen
dc.subjectStrain hardeningen
dc.subjectZirconiaen
dc.subjectAnalytical resultsen
dc.subjectDrucker prager modelen
dc.subjectHighly porous materialsen
dc.subjectIndentation analysisen
dc.subjectIsotropic elasticityen
dc.subjectMagnesia partially stabilized zirconiasen
dc.subjectPressure sensitive materialsen
dc.subjectStrain hardening effectsen
dc.subjectIndentationen
dc.subjectCoulomb criterionen
dc.subjectfinite element methoden
dc.subjecthardnessen
dc.subjectindentationen
dc.subjectMohr theoryen
dc.subjectmortaren
dc.subjectnumerical modelen
dc.subjectpressureen
dc.subjectrock propertyen
dc.subjecttesting methoden
dc.subjectElsevier Ltden
dc.titleThe use of Knoop indentation for the assessment of the plastic properties of mortars and natural stonesen
dc.typejournalArticleen


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