Numerical simulation of the cooling-down of high-zirconia fused-cast refractories

Petroni, Laetitia; Boussuge, Michel; Ryckelynck, David

doi:10.1016/j.jeurceramsoc.2012.06.004

Cited by 8 publications

(7 citation statements)

References 23 publications

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“…The Finite Element method is a numerical procedure commonly employed for approximate solutions of demanding thermomechanical problems than cannot be treated by analytical techniques [23][24][25][26][27][28]. In this study, a finite element procedure employing Lagrange elements of bilinear interpolation for the discretization of the temperature filed and biquadratic interpolation for the displacement fields is employed ( figure 8).…”

Section: Finite Element Solutionmentioning

confidence: 99%

Thermo-mechanical response FEM simulation of ceramic refractories undergoing severe temperature variations

Papathanasiou

Corso

2016

Journal of the European Ceramic Society

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The development of thermal stresses inside refractory ceramics experiencing severe thermal shock is studied. The present analysis departs from the linear theory of thermal stresses as it accounts for temperature dependent thermal and mechanical material properties. Radiation surface heat exchange between the refractory component and its surroundings is included. A Finite Element Procedure is presented and a MATLAB code is developed. The nonlinear heat equation is solved for the temperature field and this solution is subsequently used in order to determine the stress field evolution. The finite element code is validated and used for the thermal shock estimation of a refractory brick. Material properties corresponding to Al 2 O 3 are selected. A thermal cycle consisting of a heating stage followed by cooling down is simulated. The results are compared with those predicted by the linear thermal stresses theory and significant deviations are observed for the examined values of the Biot number.

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Section: Finite Element Solutionmentioning

confidence: 99%

Thermo-mechanical response FEM simulation of ceramic refractories undergoing severe temperature variations

Papathanasiou

Corso

2016

Journal of the European Ceramic Society

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“…At such a temperature, the discrepancy between the internal and external temperature of the block is typically lower than 100 • C (see fig. 11 in [6]). Such a temperature gap is indeed small but since the phase transformation of a given individual crystal is also related to its size and to the stresses applied on it, the thermal gradients might indirectly affect its final stress state.…”

Section: Discussionmentioning

confidence: 99%

“…This assumption is used within thermo-mechanical modelling studies on blocks which simulate the conditions during their production [6]. The symmetry of the strain gradient seen in Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Substantial efforts on the numerical modelling of these stresses have been ongoing for two decades [3,4,6]. Nevertheless, since the causes for the internal stresses are numerous, with each of them involving different but co-dependent phenomena, these models do not yet account for all deformation mechanisms and therefore are not yet predictive.…”

Section: Introductionmentioning

confidence: 99%

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Neutron diffraction measurements of residual stress distribution in large zirconia based refractory bricks produced by electro-fusion and casting

Örs

Gouraud

Guinebretière

et al. 2017

Journal of the European Ceramic Society

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a b s t r a c tElectro-fusion and casting is used to produce large refractory bricks (∼250 kg) containing a high amount of ZrO 2 . These bricks are used in glass-making furnaces where good mechanical performance is required at very high temperatures (>1500• C). During the manufacturing procedure, they develop large residual stresses as a result of the cooling conditions and structural phase transformations they underwent. This leads to stress concentration and crack formation at different length scales. In order to characterize these phenomena, a 'multi-scale' analysis approach is under development, where different internal strain measurement methods are combined. In this approach we benefit from different gauge volumes provided by various diffraction methods, ranging from a few hundred nanometres to a few tens of millimetres. In the present paper, the results of neutron diffraction measurements on large ZrO 2 blocks are given. These results show the level of internal strains at the millimetre scale, based on (311) reflection of the monoclinic ZrO 2 . Overall, a range of 0.025% tensile to 0.1% compressive strain was observed. Clear strain gradients were also visible, as larger values in the interior of the block were encountered.

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“…The specimens were first heated and maintained at 1500°C for 1 hour to recover the original microstructure as much as possible and relax the residual stresses [25][26][27]. From this temperature, the specimens were cooled, and the transformation occurred at 9°C/h, which corresponds to industrial cooling conditions.…”

Section: Contribution Of Modelling For the Interpretation Of Lab Testsmentioning

confidence: 99%

New advances in the laboratory characterization of refractories: testing and modelling

Poirier

Blond

Bilbao

et al. 2017

Metall. Res. Technol.

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Abstract. This publication presents new advances in the field of refractories characterization. These laboratory methods that combine experiments and numerical analyses and concern both the thermomechanical and thermochemical behaviour are illustrated through different examples: identification of asymmetrical creep, determination of elastic and inelastic properties, measurements of macroscopic deformation, phase transformations or corrosion kinetics. These advanced techniques offer the refractory community new opportunities to improve the knowledge and the prediction of the phenomena of degradation of the refractories.

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Numerical simulation of the cooling-down of high-zirconia fused-cast refractories

Cited by 8 publications

References 23 publications

Thermo-mechanical response FEM simulation of ceramic refractories undergoing severe temperature variations

Thermo-mechanical response FEM simulation of ceramic refractories undergoing severe temperature variations

Neutron diffraction measurements of residual stress distribution in large zirconia based refractory bricks produced by electro-fusion and casting

New advances in the laboratory characterization of refractories: testing and modelling

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