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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Wu, Houzheng
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Publications (3/3 displayed)
- 2024Measuring coefficient of thermal expansion of materials of micrometre size using SEM/FIB microscope with in situ MEMS heating stagecitations
- 2019Shock-wave induced compressive stress on alumina ceramics by laser peeningcitations
- 2010Fracture toughness of a zirconia engineering ceramic and the effects thereon of surface processing with fibre laser radiationcitations
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article
Fracture toughness of a zirconia engineering ceramic and the effects thereon of surface processing with fibre laser radiation
Abstract
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<sub>2</sub> 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<sub>1c</sub> of ZrO<sub>2</sub>. It was found that the best applicable equation was: K<sub>1c</sub> = 0.016 (<i>E/H</i>) <sup>1/2</sup> (<i>P/c</i> <sup>3/2</sup>), which was confirmed to be 42 per cent accurate in producing K<sub>1c</sub> values within the range of 8 to 12 MPa m<sup>1/2</sup> for ZrO<sub>2</sub>. 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<sub>1c</sub> value when K<sub>1c</sub> = 0.016 (<i>E/H</i>) <sup>1/2</sup> (<i>P/c</i> <sup>3/2</sup>) 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<sub>1c</sub> value. Also, the hardness influences the K<sub>1c</sub>, 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<sub>1c</sub>. Increasing the indentation load also varied the end K<sub>1c</sub> value, as higher indentation loads resulted in a bigger diamond footprint, and the ceramic exhibited longer crack lengths.