Comparison of instrumented Knoop and Vickers hardness measurements on various soft materials and hard ceramics

Chicot, Didier; Mercier, David; Roudet, Francine; Silva, K.; Staia, M.H.; Lesage, Jacky

doi:10.1016/j.jeurceramsoc.2006.06.011

Cited by 62 publications

(24 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Mukhopadhyay et al 22 suggested that KHN and VHN values could be correlated by a calibration factor; but Gong et al 23 indicated that the relationship may be more complex than that predicted for various materials by one relationship equation. However, Chicot et al 24 indicated that KHN values are lower than VHN values for hard materials which exhibit high hardness. For soft materials which have low hardness, KHN values are greater than VHN values.…”

Section: Discussionmentioning

confidence: 99%

Effect of indentation load and time on knoop and vickers microhardness tests for enamel and dentin

2009

View full text Add to dashboard Cite

The aim of this study was to determine the effect of variations in indentation load and time on the Knoop and Vickers hardness numbers (KHN and VHN) for enamel and dentin. Twenty molar teeth were divided into twenty enamel and twenty dentin specimens. Each specimen was tested using a Knoop or Vickers microhardness tester at different loads and times. The difference in hardness between the groups was analyzed with two-way ANOVA followed by a Tukey test. The results revealed that a difference of indentation time did not influence the microhardness number of enamel and dentin. The KHN values of enamel and the VHN values of dentin were affected by variation of test loads. Therefore, the tooth hardness number for different loads may not be acceptable for comparison.

show abstract

Section: Discussionmentioning

confidence: 99%

Effect of indentation load and time on knoop and vickers microhardness tests for enamel and dentin

2009

View full text Add to dashboard Cite

show abstract

“…In addition, it has been reported by Lawn and Howes [34] and Marshall et al [35] that an elastic recovery may occur after the indentation load, which is removed as the result of the mismatch between the plastic zone beneath the indentation and the surrounding elastic deformed material. Due to the specific shape of the indenter, the elastic recovery during the Vickers indentation is rather different than corresponding to the Knoop indentation [36].…”

Section: Knoop Microindentation Data Analysismentioning

confidence: 99%

Vickers and Knoop Indentation Microhardness Study of β-SiAlON Ceramic

Güder

Şahin

et al. 2011

Acta Phys. Pol. A

View full text Add to dashboard Cite

In this paper, analysis and interpretation of mechanical property measurements of β-SiAlON ceramic were reported. Indentation microhardness of β-SiAlON ceramic was measured using the Knoop and Vickers indenters. The analysis of the Vickers indentation microhardness data reveals the reverse indentation size effect that is the apparent microhardness increases with increasing applied indentation test load. However, the Knoop indentation microhardness data exhibit indentation size effect that is the apparent microhardness increases with decreasing applied test load. The experimental Knoop microhardness data was analyzed using Meyer's law, elastic-plastic deformation model, proportional specimen resistance model, and Hays-Kendall's model. As a result, modified proportional specimen resistance model is found to be the most effective one for the load-independent (H LI ) microhardness determination of the SiAlON ceramic. It was seen that different models used to analyze the data obtained from the Vickers indentation do not give the same intrinsic hardness value. We also present the calculation of the Young modulus, E, of the β-SiAlON ceramic.

show abstract

“…A represents the projected area of contact, and 14.229 is a constant of geometrical factor for the diamond pyramid [6]. The indentation test procedure is similar to the ASTM standard E384 (Standard Test method for Microhardness of Materials, ASTM Designation E384, 1991.…”

Section: Methodsmentioning

confidence: 99%

Mechanical Characterization of CoCrMo Alloys Consisting of Different Palladium Ratios Produced by Investment Casting Method

2015

View full text Add to dashboard Cite

CoCrMo alloys are one of the most commonly used materials for hip arthroplasty, knee and dental because of its mechanical properties, corrosion resistance, wear resistance and biocompatibility. In this study, CoCrMo alloys consisting of 1.68 to 4.33%Pd are produced by investment casting process under argon atmosphere. The microstructures and mechanical properties of CoCrMo alloy were studied using X-ray diffraction, optical microscopy, scanning electron microscopy, Knoop indentation hardness tests, focusing on the influences on the different palladium additives. The measured microhardness values of CoCrMo alloys having different palladium ratio are seen to be load-dependent. The observed load dependence was rationalized using the Hays-Kendall model and it was found that the resultant load-independent hardness decreases with increase of palladium ratios. As a results, microhardness decreases with increase of palladium amount.

show abstract

Comparison of instrumented Knoop and Vickers hardness measurements on various soft materials and hard ceramics

Cited by 62 publications

References 19 publications

Effect of indentation load and time on knoop and vickers microhardness tests for enamel and dentin

Effect of indentation load and time on knoop and vickers microhardness tests for enamel and dentin

Vickers and Knoop Indentation Microhardness Study of β-SiAlON Ceramic

Mechanical Characterization of CoCrMo Alloys Consisting of Different Palladium Ratios Produced by Investment Casting Method

Contact Info

Product

Resources

About