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 -