Examination of the indentation size effect in low-load vickers hardness testing of ceramics

1999 ◽  
Vol 19 (15) ◽  
pp. 2625-2631 ◽  
Author(s):  
Jianghong Gong ◽  
Jianjun Wu ◽  
Zhenduo Guan
Keyword(s):  
Size Effect ◽  
Vickers Hardness ◽  
Indentation Size Effect ◽  
Hardness Testing ◽  
Indentation Size ◽  
Low Load

Analysis of Load-Displacement Curves of Ceramics Measured with Low-Load Vickers Hardness Test: Indentation Size Effect

2011 ◽  
Vol 492 ◽  
pp. 9-13
Author(s):  
Bei Xu ◽  
Jiang Hong Gong
Keyword(s):  
Size Effect ◽  
Vickers Hardness ◽  
Indentation Size Effect ◽  
Hardness Test ◽  
Hardness Testing ◽  
Indentation Size ◽  
Nanoindentation Testing ◽  
Low Load ◽  
Load Displacement ◽  
Vickers Hardness Test

The load-displacement curves for a series of ceramic and glass samples were recorded continuously during the low-load Vickers hardness testing. Then the hardnesses of all samples were determined by analyzing the unloading curves. It was found that all the test materials exhibit indentation size effect (ISE) similar to that observed in nanoindentation testing. The applicability of the proportional specimen resistance (PSR) model and the modified PSR model was then examined using the measured indentation data.

The frictional component of the indentation size effect in low load microhardness testing

1993 ◽  
Vol 8 (5) ◽  
pp. 1028-1032 ◽  
Author(s):  
H. Li ◽  
A. Ghosh ◽  
Y.H. Han ◽  
R.C. Bradt
Keyword(s):  
Size Effect ◽  
Test Specimen ◽  
Indentation Size Effect ◽  
Volume Ratio ◽  
Indentation Size ◽  
Proportional Specimen Resistance ◽  
Low Load ◽  
Microhardness Testing ◽  
Hardness Increase

The role of friction between the microhardness indenter and the test specimen is addressed through the analysis of dry (unlubricated) and lubricated tests on iron by Atkinson and Shi. Quantitative evaluation through a proportional specimen resistance model accurately describes the results. It suggests that friction is a major portion of the observed hardness increase at low test loads, the indentation size effect. The ISE is related to the surface-area-to-volume ratio of the indentation, which is inversely related to the indentation dimension.

Vickers hardness indentation size effect in selective laser melted MS1 maraging steel

2019 ◽  
pp. 095440621989230 ◽  
Author(s):  
Sebastian Balos ◽  
Dragan Rajnovic ◽  
Leposava Sidjanin ◽  
Olivera Eric Cekic ◽  
Slobodan Moraca ◽  
...  
Keyword(s):  
Size Effect ◽  
Cross Sections ◽  
Vickers Hardness ◽  
Indentation Size Effect ◽  
Full Range ◽  
Indentation Size ◽  
Load Dependence ◽  
Proportional Specimen Resistance ◽  
Heat Treated ◽  
Correlation Factors

In this paper, selective laser melting fabricated specimens in non-heat-treated and heat-treated conditions were subjected to Vickers microhardness testing, by using a full range of loadings: 10, 25, 50, 100, 200, 300, 500, and 1000 g. Microhardness of longitudinal sections and cross-sections were correlated and the obtained values were plotted against loadings and indentation size effect was studied, in order to find the optimal loading range, that gives the material true microhardness, or load-independent hardness. The load dependence of the measured Vickers hardness values was described quantitatively through the application of the Meyer’s law, proportional specimen resistance, and the modified proportional specimen resistance model. It was found that the microhardness rises as the loading is higher, causing a reversed indentation size effect, clearly indicating the range of true hardnesses of the tested material. Also, proportional specimen resistance and modified proportional specimen resistance models were found to have the highest correlation factors indicating their higher adequacy compared to Meyer’s prediction model.

Analysis of Indentation Size Effect of Vickers Hardness Tests of Steels

2013 ◽  
Vol 652-654 ◽  
pp. 1307-1310 ◽  
Author(s):  
Nyoman Budiarsa ◽  
Andrew Norbury ◽  
Xiao Xiang Su ◽  
Gareth Bradley ◽  
Xue Jun Ren
Keyword(s):  
Experimental Data ◽  
Size Effect ◽  
Power Law ◽  
Vickers Hardness ◽  
Material Properties ◽  
Indentation Size Effect ◽  
Indentation Load ◽  
Indentation Size ◽  
Load Range ◽  
Hardness Tests

In this work, the indentation size effect (ISE) in Vickers hardness tests of steel with selected heat treatments (annealed or tempered) has been investigated and analysed. Systematical hardness tests were performed within a commonly used micro-load range. The experimental data was analysed according to the Meyer power-law and the proportional specimen resistance (PSR) models and the link between ISE and material properties was discussed. The results showed that the experimental data fitted well with the Mayers power-law (P = A.dn) and the PSR (P/d = al + a2d) models. The ISE index (n) showed a good correlation with the hardness-elastic modulus ratio (H/E), which potentially could be used to predict the relative contributions of the elastic and plastic deformation contact area under indentation load and to normalize the hardness values for inverse material properties .

Indentation size effect, geometrically necessary dislocations and pile-up effects in hardness testing of irradiated nickel

2021 ◽  
Vol 207 ◽  
pp. 116702
Author(s):  
M.A. Mattucci ◽  
I. Cherubin ◽  
P. Changizian ◽  
T. Skippon ◽  
M.R. Daymond
Keyword(s):  
Size Effect ◽  
Indentation Size Effect ◽  
Hardness Testing ◽  
Indentation Size ◽  
Pile Up

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
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