The indentation load/size effect and the measurement of the hardness of vitreous silica

1992 ◽  
Vol 146 ◽  
pp. 197-212 ◽  
Author(s):  
Hong Li ◽  
Richard C. Bradt
Keyword(s):  
Size Effect ◽  
Vitreous Silica ◽  
Indentation Load ◽  
Load Size

scholarly journals Indentation Load-Size Effect in Al2O3 — SIC Nanocomposites

2010 ◽  
Vol 61 (5) ◽  
pp. 305-307 ◽  
Author(s):  
Erika CsehovAaA ◽  
Jana AndrejovskAaA ◽  
Apichart Limpichaipanit ◽  
Ján Dusza ◽  
Richard Todd
Keyword(s):  
Size Effect ◽  
Vickers Hardness ◽  
Indentation Load ◽  
Proportional Specimen Resistance ◽  
Load Size ◽  
Hardness Values ◽  
True Hardness

Indentation Load-Size Effect in Al2O3 — SIC Nanocomposites The indentation load-size effect (ISE) in Vickers hardness of Al2O3 and Al2O3 + SiC nanocomposites has been investigated and analysed using Meyer law, proportional specimen resistance (PSR) model and modified proportional specimen resistance (MPSR) model. The strongest ISE was found for alumina. Both the PSR and MPSR models described the ISE well, but the MPSR model resulted in slightly lower true hardness values for all materials investigated. No evidence of the effect of machining stresses on the ISE has been found.

Indentation Testing of an Al2O3/Al2O3 + ZrO2 Layered Composite

2005 ◽  
Vol 290 ◽  
pp. 316-319
Author(s):  
Peter Zimovčák ◽  
Tibor Köves ◽  
Ján Dusza ◽  
Ladislav Pešek ◽  
Francis Chalvet ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Residual Stresses ◽  
Size Effect ◽  
Vickers Hardness ◽  
Layered Composite ◽  
Indentation Load ◽  
Indentation Fracture ◽  
Depth Sensing ◽  
The Individual ◽  
Load Size

Micro- and macro-hardness of the individual layers of an Al2O3 / Al2O3 + ZrO2 layered composite have been investigated. The indentation load size effect has been studied in a range of indentation load of 25 mN – 100 N using depth sensing indentation technique and conventional Vickers hardness testers. Fracture toughness values of the layers have been measured using indentation fracture method. The effect of residual stresses on the KIC value has been analyzed.

Nanohardness of Individual Phases in WC – Co Cemented Carbides

2013 ◽  
Vol 586 ◽  
pp. 23-26 ◽  
Author(s):  
Annamária Duszová ◽  
Radoslav Halgaš ◽  
Pavol Priputen ◽  
Marek Bľanda ◽  
Pavol Hvizdoš ◽  
...  
Keyword(s):  
Size Effect ◽  
Significant Influence ◽  
Crystallographic Orientation ◽  
Grain Orientation ◽  
Indentation Load ◽  
Cemented Carbides ◽  
Indentation Modulus ◽  
Instrumented Indentation ◽  
Load Size

The nanohardness of WC – Co hardmetals has been investigated using instrumented indentation and Berkovich tip indenter. The nanohardness, HIT, and indentation modulus, EIT, of Co phase and individual WC grains and the influence of their crystalographic orientation have been studied. SEM, AFM and EBSD methods were used for the characterization of the microstructures and indents and for the identification of crystallographic orientation of WC grains, respectively. Strong indentation load-size effect and significant influence of the crystallographic orientation of WC crystals on HIT and EIT have been found. The nanohardness of Co binder was approximately 10 GPa and that of WC grains varied between 25 and 50 GPa, depending on the grain orientation and load. The nanohardness values of the basal and prismatic planes of individual WC grains at load of 10 mN were 40.4 ± 1.6 GPa and 32.8 ± 2.0 GPa, respectively.

Hardness and indentation load-size effect in Al2O3-SiC nanocomposite

2011 ◽  
Vol 49 (2) ◽  
pp. 119-124 ◽  
Author(s):  
E. CSEHOVA ◽  
J. ANDREJOVSKA ◽  
A. LIMPICHAIPANIT ◽  
J. DUSZA ◽  
R. TODD
Keyword(s):  
Size Effect ◽  
Indentation Load ◽  
Load Size

scholarly journals Microhardness Anisotropy and the Indentation Load/Size Effect in MgO⋅xAl2O3 Single Crystals

1991 ◽  
Vol 99 (1155) ◽  
pp. 1079-1087 ◽  
Author(s):  
Hong LI ◽  
Hisayuki SUEMATSU ◽  
Takayoshi ISEKI ◽  
Richard C. BRADT
Keyword(s):  
Size Effect ◽  
Single Crystals ◽  
Indentation Load ◽  
Load Size

Indentation Size Effect (ISE) of Vickers Hardness in Steels: Correlation with H/E

2013 ◽  
Vol 391 ◽  
pp. 23-28 ◽  
Author(s):  
I. Nyoman Budiarsa
Keyword(s):  
Size Effect ◽  
Power Law ◽  
Indentation Size Effect ◽  
Hardness Test ◽  
Indentation Load ◽  
Model Material ◽  
Modulus Ratio ◽  
Indentation Size ◽  
Load Range ◽  
Power Law Index

The indentation size effect (ISE) in Vickers test using steel as a typical model material group with selected heat treatments (annealed or tempered) has been investigated and analysed. Systematically hardness test were performed within a commonly used micro-load range. The ISE data was analysed by fitting data following the Meyer power law and the proportional specimen resistance (PSR) models and the link between ISE and the hardness-to-modulus ratio (H/E) was discussed. The results show that the ISE data correlated well with the Meyers power law (P= A.dn) and the PSR (P/d=a1+a2d) models. The ISE power law index n exhibited a reasonable agreement with the hardness-elastic modulus ratio (H/E), which potentially could be used the relative contributions of plastic and elastic deformation contact area under indentation load and as a measurable input for inverse material parameter prediction.

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.

Indentation Testing of MoSi2

2005 ◽  
Vol 290 ◽  
pp. 288-291 ◽  
Author(s):  
M. Henžel ◽  
Peter Zimovčák ◽  
Ján Dusza ◽  
András Juhász ◽  
Janos Lendvai
Keyword(s):  
High Temperature ◽  
Indentation Load ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Slip Systems ◽  
Deformation Characteristics ◽  
Depth Sensing ◽  
Indentation Methods ◽  
Load Size ◽  
Hardness Values

Indentation methods have been used for the study of the hardness and deformation characteristics MoSi2. Micro-nanoindentation tests at loads from 10 mN to 2000 mN were carried out using the depth-sensing method. Measurements of the microhardness using conventional Vickers method was carried out at loads of 500 mN, 1000 mN and 2000 mN. The Universal (Martens), Plastic and conventional Vickers hardness values were calculated at different indentation loads. Evident indentation load - size effect was found in both materials. According to the results, the pre-strain reduces the micro-nano hardness values, probably due to the activation of slip systems during the high-temperature deformation.

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