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.

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.

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.

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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