A method to characterize asymmetrical three-stage creep of ordinary refractory ceramics and its application for numerical modelling
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In: Journal of the European Ceramic Society, Vol. 39.2019, No. 14, 06.06.2019, p. 4384-4393.
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TY - JOUR
T1 - A method to characterize asymmetrical three-stage creep of ordinary refractory ceramics and its application for numerical modelling
AU - Schachner, Stefan
AU - Jin, Shengli
AU - Gruber, Dietmar
AU - Harmuth, Harald
PY - 2019/6/6
Y1 - 2019/6/6
N2 - During operation, thermomechanical stresses occur in refractory linings. Under elevated stress and temperatures, these ceramics experience primary creep, which can further proceed to the secondary and tertiary creep stages. This necessitates a characterization of their three-stage creep behavior. Hence, two advanced uniaxial tensile and compressive creep testing devices are utilized. The Norton-Bailey creep equations and an inverse identification procedure are applied for the evaluation of the creep curves. To account for the full three-stage creep behavior in thermomechanical modelling activities, a creep-stage transition criterion is identified and subsequently implemented together with the Norton-Bailey creep-strain rate representations in a new developed creep model. The finite element simulation results from different creep testing procedures are in accordance with the corresponding experimental results of a magnesia-chromite refractory ceramic. The study also reveals the temperature-dependent asymmetrical creep behavior of the material in terms of the creep-strain rates and critical creep strains.
AB - During operation, thermomechanical stresses occur in refractory linings. Under elevated stress and temperatures, these ceramics experience primary creep, which can further proceed to the secondary and tertiary creep stages. This necessitates a characterization of their three-stage creep behavior. Hence, two advanced uniaxial tensile and compressive creep testing devices are utilized. The Norton-Bailey creep equations and an inverse identification procedure are applied for the evaluation of the creep curves. To account for the full three-stage creep behavior in thermomechanical modelling activities, a creep-stage transition criterion is identified and subsequently implemented together with the Norton-Bailey creep-strain rate representations in a new developed creep model. The finite element simulation results from different creep testing procedures are in accordance with the corresponding experimental results of a magnesia-chromite refractory ceramic. The study also reveals the temperature-dependent asymmetrical creep behavior of the material in terms of the creep-strain rates and critical creep strains.
KW - Creep
KW - Ceramic material
KW - Finite element (FE) model
KW - Mechanical testing
KW - Asymmetric
KW - Refractories
UR - http://www.scopus.com/inward/record.url?scp=85067049219&partnerID=8YFLogxK
U2 - 10.1016/j.jeurceramsoc.2019.06.010
DO - 10.1016/j.jeurceramsoc.2019.06.010
M3 - Article
VL - 39.2019
SP - 4384
EP - 4393
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
SN - 0955-2219
IS - 14
ER -