Results 231 to 240 of about 12,577,788 (269)

Numerical simulation of indentation with size effect

Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing, 2006
Abstract 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 ...
Jinsong Hua, S Swaddiwudhipong
exaly   +2 more sources

The correlation of the indentation size effect measured with indenters of various shapes

Journal of the Mechanics and Physics of Solids, 2002
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G M Pharr, E P George
exaly   +3 more sources

Effect of the indenter size on the indentation of aluminum

Materials Characterization, 2006
Abstract 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, Lingling Peng, Kenji Okazaki   +2 more
openaire   +1 more source

Indentation size effect in spherical and pyramidal indentations

Journal of Physics D: Applied Physics, 2008
The indentation size effect (ISE) is studied for spherical and pyramidal indentations on a Ni poly-crystal. The indentation experiments were conducted using a Berkovich geometry as well as different spherical indenters with radii of 0.38, 3.8 and 51.0??m.
Karsten Durst, Mathias Göken, George M Pharr   +2 more
openaire   +1 more source

Effect of Indenter Size on Elastic Modulus of Cartilage Measured by Indentation

Journal of Biomechanical Engineering, 2007
Abstract 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, Hui, Jin, Mellanie L, Hall, Sidharth, Chiravarambath, Jack L, Lewis   +4 more
openaire   +2 more sources

Interpretations of Indentation Size Effects

Journal of Applied Mechanics, 2002
For very shallow indentations in W, Al, Au, and Fe-3wt%Si single crystals, hardness decreased with increasing depth irrespective of increasing or decreasing strain gradients. As such, strain gradient theory appears insufficient to explain the indentation size effect (ISE) at depths less than several hundred nanometers. Present research links the ISE to
W. W. Gerberich, N. I. Tymiak, J. C. Grunlan, M. F. Horstemeyer, M. I. Baskes   +4 more
openaire   +1 more source

Indentation size effect in MgO

Scripta Materialia, 2004
Abstract The indentation size effect (ISE) model of Nix and Gao overestimates the hardness of MgO for small indentations. The cause may be associated with a slight expansion of the plastic zone. If the plastic zone has an effective radius fa, experimental data indicate that f increases for small indentations and is 1.66 at zero indentation depth.
Feng, Gang., Nix, William.
openaire   +1 more source

Size effects in micro- and nanoscale indentation

Acta Materialia, 2006
Abstract The indentation size effect (ISE) has been studied in single crystals, polycrystals and amorphous solids using the Vickers microhardness test. The ISE is clearly present in single crystals but is absent in fine-grained polycrystals. A size-dependent hardness for amorphous solids is observed only in the sub-micrometre surface layer.
Ilze Manika, Jänis Maniks
exaly   +2 more sources

Interactive effect of indenter size and specimen thickness in Hertzian indentation test

Dental Materials, 2010
To 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
openaire   +2 more sources

Indentation size effect in nanoporous gold

Acta Materialia, 2017
Abstract 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
Heung Nam Han, Ju-Young Kim, Jae-Il Jang   +2 more
exaly   +3 more sources