scholarly journals Determination of the load-independent hardness by analyzing the nanoindentation loading curves: A case study on fused silica

2019 ◽  
Vol 8 (4) ◽  
pp. 583-586 ◽  
Author(s):  
Yunbiao Duan ◽  
Danyu Jiang ◽  
Jin Hu
Keyword(s):  
Size Effect ◽  
Applied Load ◽  
Indentation Size Effect ◽  
Empirical Method ◽  
Fused Silica ◽  
Nanoindentation Test ◽  
Indentation Size ◽  
Theoretical Relationship

AbstractThe nanoindentation loading curves measured on fused silica were analyzed based on the theoretical relationship derived by Malzbender et al. (J Mater Res 2000, 15: 1209–1212). It was found that the ratio of the applied load to the square of the displacement, P/(h + hd)2, does not keep constant during loading segment of the nanoindentation test. Considering the existence of the indentation size effect, an empirical method for the determination of the load-independent hardness by analyzing the nanoindentation loading curves was proposed.

A Generalized Load-Penetration Relation for Sharp Indenters and the Indentation Size Effect

2002 ◽  
Vol 69 (3) ◽  
pp. 394-396 ◽  
Author(s):  
Z. Y. Li ◽  
S. Chandrasekar ◽  
H. T. Yang
Keyword(s):  
Size Effect ◽  
Indentation Size Effect ◽  
Material Model ◽  
Plastic Behavior ◽  
Gradient Plasticity ◽  
Indentation Size ◽  
Pressure Sensitive ◽  
Self Similar ◽  
Isotropic Solids

A 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. This extends and generalizes a similar result obtained for isotropic solids showing conventional plastic behavior. When a strain-gradient plasticity is incorporated into the material model, then it is found that P is no longer proportional to δ2. Implications of the results for the indentation size-effect and for the determination of stress-strain curves from indentation are discussed.

scholarly journals A Comparison of the Indentation Size Effect in Fused Silica and Crystalline Quartz

2014 ◽  
Vol 129 (4) ◽  
pp. 180-183
Author(s):  
Lei Zhang ◽  
Richard C. Bradt
Keyword(s):  
Size Effect ◽  
Surface Area ◽  
Indentation Size Effect ◽  
Indentation Load ◽  
Fused Silica ◽  
Indentation Size ◽  
Crystalline Quartz

Abstract The Indentation Size Effect (ISE) in Fused Silica and Crystalline Quartz were measured by both Knoop and Vicker indenters and both exhibited a crossover for the different indenters at about the same indentation load. The crossover can be explained by the ratio of the (surface area/indentation volume) from the geometries of the two indenters.

Nanoindentation Size Effects for Calcium Silicate Hydrate

2010 ◽  
Vol 177 ◽  
pp. 537-540
Author(s):  
Wu Yao ◽  
Kang Liang
Keyword(s):  
Size Effect ◽  
Size Effects ◽  
Calcium Silicate ◽  
Calcium Silicate Hydrate ◽  
Indentation Size Effect ◽  
High Density ◽  
Nanoindentation Test ◽  
Low Density ◽  
Indentation Size ◽  
Basic Composition

Hardness of Calcium Silicate Hydrate (CSH) at different ages was measured by nanoindentation test. The results show obvious indentation size effect in hardness of CSH. Hardness decreases with increasing depth. Moreover, both low density CSH and high density CSH follow the same size effect law in hardness. This phenomenon further indicates that two types of CSH are of the same basic composition but different packing densities.

scholarly journals Investigation of the mechanism of the indentation size effect for titanium

2019 ◽  
Vol 6 (2) ◽  
pp. 18-00545-18-00545
Author(s):  
Shota HASUNUMA ◽  
Hirohisa MIYAZAKI ◽  
Takeshi OGAWA
Keyword(s):  
Size Effect ◽  
Indentation Size Effect ◽  
Indentation Size

Indentation size effect of cortical bones submitted to different soft tissue removals

2013 ◽  
Vol 20 ◽  
pp. 338-346 ◽  
Author(s):  
A. Bandini ◽  
D. Chicot ◽  
P. Berry ◽  
X. Decoopman ◽  
A. Pertuz ◽  
...  
Keyword(s):  
Soft Tissue ◽  
Size Effect ◽  
Indentation Size Effect ◽  
Indentation Size

Further analysis of the size effect in indentation hardness tests of some metals

1995 ◽  
Vol 10 (11) ◽  
pp. 2908-2915 ◽  
Author(s):  
M. Atkinson
Keyword(s):  
Size Effect ◽  
Strain Hardening ◽  
Indentation Size Effect ◽  
Plastic Hinge ◽  
Small Scale ◽  
Indentation Hardness ◽  
Vickers Indentation ◽  
Indentation Size ◽  
Hardness Tests ◽  
Indentation Tests

The variation of apparent hardness observed in previously reported Vickers indentation tests of metals is reexamined. Common deseriptions of the effect are shown to be inaccurate: the variation of apparent hardness is monotonic but not simple. The effect is consistent with varying size of a previously postulated “plastic hinge” at the perimeter of the indent. This complexity confers uncertainty on the estimation of characteristic macrohardness from small scale tests. Association of the indentation size effect with friction and with strain hardening is confirmed.

Evaluating plastic flow properties by characterizing indentation size effect using a sharp indenter

2008 ◽  
Vol 56 (14) ◽  
pp. 3338-3343 ◽  
Author(s):  
Ju-Young Kim ◽  
Seung-Kyun Kang ◽  
Julia R. Greer ◽  
Dongil Kwon
Keyword(s):  
Size Effect ◽  
Plastic Flow ◽  
Indentation Size Effect ◽  
Flow Properties ◽  
Indentation Size
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