Elastic/plastic indentation in ceramics: a fracture toughness determination method

Miranzo, P.; Moya, J. S.

doi:10.1016/0272-8842(84)90005-1

Cited by 90 publications

(25 citation statements)

References 8 publications

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“…Complying with the regulations ensured that the tests conducted on the ceramics were valid. Moreover, other investigators further demonstrated the use of a more empirical equation, further illustrated in this paper, and the accuracy and validation of the equation, as well as the machine accuracy of various indentation techniques [40][41][42][43][44][45][46][47][48].…”

Section: Introductionmentioning

confidence: 96%

Fracture Toughness of a Zirconia Engineering Ceramic and the Effects Thereon of Surface Processing with Fibre Laser Radiation

Shukla

Lawrence

2010

Proceedings of the Institution of Mechanical Engineers, Part B:

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Vickers hardness indentation tests were employed to investigate the near-surface changes in the hardness of a fibre laser-treated and an as-received ZrO 2 engineering ceramic. Indents were created using 5, 20, and 30 kg loads to obtain the hardness. Optical microscopy, white-light interferometry, and a coordinate measuring machine were then used to observe the crack lengths and crack geometry. Palmqvist and half-penny median crack profiles were found, which dictated the selection of the group of equations used herein. Computational and analytical approaches were then adapted to determine the K 1c of ZrO 2 . It was found that the best applicable equation was:1/2 (P/c 3/2 ), which was confirmed to be 42 per cent accurate in producing K 1c values within the range of 8 to 12 MPa m 1/2 for ZrO 2 . Fibre laser surface treatment reduced the surface hardness and produced smaller crack lengths in comparison with the as-received surface. The surface crack lengths, hardness, and indentation loads were found to be important, particularly the crack length, which significantly influenced the end K 1c value when K 1c ¼ 0.016 (E/H) 1/2 (P/c 3/2 ) was used. This is because, the longer the crack lengths, the lower the ceramic's resistance to indentation. This, in turn, increased the end K 1c value. Also, the hardness influences the K 1c , and a softer surface was produced by the fibre laser treatment; this resulted in higher resistance to crack propagation and enhanced the ceramic's K 1c . Increasing the indentation load also varied the end K 1c value, as higher indentation loads resulted in a bigger diamond footprint, and the ceramic exhibited longer crack lengths.

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Section: Introductionmentioning

confidence: 96%

Fracture Toughness of a Zirconia Engineering Ceramic and the Effects Thereon of Surface Processing with Fibre Laser Radiation

Shukla

Lawrence

2010

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…This is why it was required that an investigation was carried out in order to determine the most employable equation for this study. There were 10 equations selected in this study from various equations discussed in [7,8,29] ) log (4.5 a/c) for 0.5 ≤ c/a < 4.5 [62] (11)…”

Section: -Determination Of K 1c Using Empirical Equationsmentioning

confidence: 99%

Fracture toughness modification by using a fibre laser surface treatment of a silicon nitride engineering ceramic

Shukla

Lawrence

2010

J Mater Sci

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Surface treatment of a silicon nitride (Si 3 N 4 ) engineering ceramic with fibre laser radiation was conducted to identify changes in the fracture toughness as measured by K 1c . A Vickers macrohardness indentation method was adopted to determine the K 1c of the Si 3 N 4 before and after fibre laser surface treatment. Optical and a scanning electron microscopy (SEM), a co-ordinate measuring machine and a focus variation technique were used to observe and measure the dimensions of the Vickers indentation, the resulting crack lengths, as well as the crack geometry within the as-received

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“…The toughness, K IC , was also determined by microindentation (diamond indenter Leco 100-A, St. Joseph, MI, USA), but, for this specific property, the applied load was 98 N with an indentation time of 10 s. The fracture toughness was calculated using the formula given by Miranzo and Moya [10].…”

Section: Characterizationmentioning

confidence: 99%

Electroconductive Alumina–TiC–Ni nanocomposites obtained by Spark Plasma Sintering

Rodriguez-Suarez

Bartolomé

Smirnov

et al. 2011

Ceramics International

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In the present work, the processing and characterization of electroconductive Alumina-TiC-Ni nanocomposites obtained by Spark Plasma Sintering (SPS) are described. These nanocomposites are singular due to the excellent mechanical properties they present (particular regarding Vickers hardness, 25.6 AE 0.7 GPa), as well as their extremely good wear behaviour, studied under ''ball-on-disk'' dry sliding conditions. The wear rate obtained was 25 times (almost 1.5 orders of magnitude) smaller than the value obtained for a monolithic alumina sintered under the same conditions. Flexural strength had been improved up to 75% with respect to the monolithic alumina processed under the same conditions. As these nanocomposites can be machined by electroerosion (EDM), they can adopt any shape for devices requiring a good mechanical performance and low wear rates.

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Elastic/plastic indentation in ceramics: a fracture toughness determination method

Cited by 90 publications

References 8 publications

Fracture Toughness of a Zirconia Engineering Ceramic and the Effects Thereon of Surface Processing with Fibre Laser Radiation

Fracture Toughness of a Zirconia Engineering Ceramic and the Effects Thereon of Surface Processing with Fibre Laser Radiation

Fracture toughness modification by using a fibre laser surface treatment of a silicon nitride engineering ceramic

Electroconductive Alumina–TiC–Ni nanocomposites obtained by Spark Plasma Sintering

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