Experimental and numerical investigation of the asymmetric primary creep of a fibre reinforced refractory concrete at 1200 degrees C

Gilles Dusserre 1 Olivier Valentin 2 Fabien Nazaret 2 Thierry Cutard 1
1 ICA - Institut Clément Ader
2 Aurock
Abstract : Tension/compression asymmetry is a key feature of the creep behaviour of ceramics at high temperature. This paper investigates the capability of Drucker-Prager creep model, based on a sensitivity of the equivalent creep stress to the pressure, to account for the creep behaviour of a refractory concrete subjected to compression and bending. A relevant calibration procedure is proposed. The analysis mainly focuses on the associativity of the creep flow. A profile analysis of a compressed sample allows concluding that the creep flow is dilatant and thus associated. A discussion on the neutral axis shift during bending creep is carried out with the model calibrated on the experiments.
Keywords : Finite elements Constitutive behaviour Concrete Mechanical testing Creep
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Gilles Dusserre, Olivier Valentin, Fabien Nazaret, Thierry Cutard. Experimental and numerical investigation of the asymmetric primary creep of a fibre reinforced refractory concrete at 1200 degrees C. Journal of the European Ceramic Society, Elsevier, 2016, 36 (10), p. 2627-2639. ⟨10.1016/j.jeurceramsoc.2016.03.007⟩. ⟨hal-01609021⟩

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