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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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Shukla, P. P.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (9/9 displayed)
- 2011Mathematical modelling of the fibre laser surface processing of a zirconia engineering ceramic by means of three-dimensional finite element analysiscitations
- 2011Characterization and compositional study of a ZrO2 engineering ceramic irradiated with a fibre laser beamcitations
- 2011Influence of laser beam brightness during surface treatment of a ZrO2 engineering ceramic
- 2011Distribution of temperature during fibre laser radiation and the effects on the phase transformation of ZrO2 engineering ceramiccitations
- 2011Modification of fracture toughness parameter K1c following CO2 laser surface treatment of Si3N4 engineering ceramiccitations
- 2011Evaluation of fracture toughness of ZrO2 and Si3N4 engineering ceramics following CO2 and fibre laser surface treatmentcitations
- 2011Examination of temperature distribution and the thermal effects on Si3N4 engineering ceramics during fibre laser surface treatmentcitations
- 2010Fracture toughness modification by using a fibre laser surface treatment of a silicon nitride engineering ceramiccitations
- 2010On the establishment of an appropriate method for evaluating the residual stresses after laser surface treatment of ZrO2 and Si3N4 engineering ceramics
Places of action
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article
On the establishment of an appropriate method for evaluating the residual stresses after laser surface treatment of ZrO2 and Si3N4 engineering ceramics
Abstract
A new approach of predicting the residual stresses following a CO<sub>2</sub> and fibre laser surface treatment of Si<sub>3</sub>N<sub>4</sub> and ZrO<sub>2</sub> engineering ceramics is proposed. The approach used a three-point bending test to predict the localized residual stresses present within the engineering ceramics by using condition of static equilibrium and bending moment. This allowed one to determine the local microscopic residual stresses present and an understanding of the stress state within the surface and through the cross section of the as-received and the laser irradiated engineering ceramics. The findings showed that both of the CO<sub>2</sub> and the fibre laser irradiated samples induced tensile residual stress into the engineering ceramics through the high temperature gradient that was inhibited by the laser surface treatments in comparison to the as-received samples of the two engineering ceramics. The results were more significant for the fibre laser surface treated ZrO<sub>2</sub> engineering ceramic in particular as opposed to theCO<sub>2</sub> laser radiated ZrO<sub>2</sub> engineering ceramic. It was postulated that the difference in the depth of energy absorbed by the fibre laser in comparison to the CO<sub>2</sub> laser as well as the temperature difference between the two lasers was inducing different level of thermal energy into the sub-surfaces of the ZrO<sub>2</sub> and the Si<sub>3</sub>N<sub>4</sub> engineering ceramics. This inherently had generated variation in the residual stress induced within the bulk of the engineering ceramics as there was more expansion and contraction produced within the samples irradiated by the fibre laser as opposed to the CO<sub>2</sub> laser which produced lower processing temperature.