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Indentation size effect in nanoporous gold
Acta Materialia, 2017Abstract We find that hardness of nanoporous gold (np-Au) measured by nanoindentation tends to increase with decreasing indentation depth, similar to the indentation size effect (ISE) in solid materials. While ISE in solid materials is attributed to a local increase in density of geometrically necessary dislocations (GNDs), the origin of ISE in np-Au
Kim, Young-Cheon +5 more
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Indentation size effect: reality or artefact?
Journal of Materials Science, 1996The purpose of this investigation was to study the load dependence of the microhardness, typically in the range 5–500 gf. This well known phenomena is called the indentation size effect (ISE) and was investigated for two sets of specimens: titanium and aluminium alloys.
A. Iost, R. Bigot
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Effect of the indenter size on the indentation of aluminum
Materials Characterization, 2006Abstract The indentation behavior of annealed Al was examined using spherical indenters of different radii (0.01, 0.05, 0.1, 0.2 and 0.5 mm). The indentation stress–strain curves displayed similar strain-hardening behavior regardless of the size of indenter, while the altitude increased with the decrease of the size of indenter.
Fuqian Yang +2 more
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Interactive effect of indenter size and specimen thickness in Hertzian indentation test
Dental Materials, 2010To investigate the effect of indenter size on the failure mode of amalgam and its interaction with thickness.Dental silver amalgam (Lojic+, SDI) discs, 10 mm diameter, thickness h=0.4-8.0 mm, were stored in air at 37 degrees C for 7 days before testing in 'Hertzian contact', resting freely on a 30% glass fibre-reinforced nylon 6,6 substrate (E: 10GPa ...
Yan, Wang, B W, Darvell
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Vickers indentation tests on olivine: size effects
Physics and Chemistry of Minerals, 2020We conducted Vickers indentation tests on Fe-free (Mg2SiO4) and Fe-bearing (Mg1.8Fe0.2SiO4) olivine single crystals and high-density polycrystalline material with average grain sizes ranging from 170 to 890 nm. The Vickers microhardness ($$H_{{\text{v}}}$$) of the Fe-free polycrystalline material with the finest grain size is ~ 17 GPa at a load of 0.1 ...
Sanae Koizumi +2 more
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Effect of Indenter Size on Elastic Modulus of Cartilage Measured by Indentation
Journal of Biomechanical Engineering, 2007Abstract Our preliminary indentation experiments showed that the equilibrium elastic modulus of murine tibial cartilage increased with decreasing indenter size: flat-ended 60deg conical tips with end diameters of 15μm and 90μm gave 1.50±0.82MPa (mean±standard deviation) and 0.55±0.11MPa, respectively (p<0.01).
Narendra K, Simha +4 more
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Prediction of Micro and Nano Indentation Size Effects from Spherical Indenters
Mechanics of Advanced Materials and Structures, 2012In the present work, a micromechanical model based on dislocation mechanics for predicting indentation size effect from spherical indenters is developed and compared with the most widely used Swadener et al. (2002) model. The key idea proposed here while deriving the model is that a nonlinear coupling between the geometrically necessary dislocations ...
Rashid K. Abu Al-Rub, Abu N. M. Faruk
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A Generalized Load-Penetration Relation for Sharp Indenters and the Indentation Size Effect
Journal of Applied Mechanics, 2002A dimensional analysis has been made of elastic-plastic indentation of an anisotropic solid, and of a solid showing pressure-sensitive yield behavior. It is found that, P∝δ2, for indentation with sharp, self-similar indenters, where P is the load applied by the indenter and δ is the corresponding distance of penetration of the indenter into the solid ...
Li, Z. Y., Chandrasekar, S., Yang, H. T.
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Numerical simulation of indentation with size effect
Materials Science and Engineering: A, 2006Abstract Indentation size effect (ISE), whereby the strength of materials is observed to increase significantly with decreasing indentation depths has been reported in several experimental studies. In the present study, a series of nanoindentation experiments with maximum indentation depths varying from 400 to 3400 nm are carefully designed and ...
Tho, K.K. +3 more
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Indentation size effect and strain-hardening
Journal of Materials Science Letters, 1989Analyse theorique de la relation de Meyer entre la charge de l'indenteur spherique (de Brinell) L et d le diametre d de l'indentation: L=ad ...
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