R-curves determination of ordinary refractory ceramics assisted by digital image correlation method
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in: Journal of the European Ceramic Society, Jahrgang 40.2020, Nr. 13, 20.05.2020, S. 4655-4663.
Publikationen: Beitrag in Fachzeitschrift › Artikel › Forschung › (peer-reviewed)
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TY - JOUR
T1 - R-curves determination of ordinary refractory ceramics assisted by digital image correlation method
AU - Dai, Yajie
AU - Harmuth, Harald
AU - Jin, Shengli
AU - Gruber, Dietmar
AU - Yawei, Li
N1 - Publisher Copyright: © 2020 Elsevier Ltd
PY - 2020/5/20
Y1 - 2020/5/20
N2 - As a figure-of-merit, the rising ratio of crack propagation resistance to fracture initiation resistance indicates a reduction of the brittleness and enhances the thermal shock resistance of ordinary refractory ceramics. The significant nonlinear fracture behaviour is related to the development of a fracture process zone (FPZ). The universal dimensionless load–displacement diagram method is applied as a promising graphical method for the determination of R-curves for magnesia refractories showing different brittleness. By applying digital image correlation (DIC) together with the graphical method, the problems arisen with accurate determination of the fracture initiation resistance and the crack length are overcome. Meanwhile, the R-curve is subdivided with respect to the fracture processes, viz the fracture initiation, the development of FPZ and the onset of traction free macro-crack. With the simultaneous crack lengths evaluated from DIC, the contribution of each fracture process to the crack propagation resistance at certain loading stage is quantitatively presented.
AB - As a figure-of-merit, the rising ratio of crack propagation resistance to fracture initiation resistance indicates a reduction of the brittleness and enhances the thermal shock resistance of ordinary refractory ceramics. The significant nonlinear fracture behaviour is related to the development of a fracture process zone (FPZ). The universal dimensionless load–displacement diagram method is applied as a promising graphical method for the determination of R-curves for magnesia refractories showing different brittleness. By applying digital image correlation (DIC) together with the graphical method, the problems arisen with accurate determination of the fracture initiation resistance and the crack length are overcome. Meanwhile, the R-curve is subdivided with respect to the fracture processes, viz the fracture initiation, the development of FPZ and the onset of traction free macro-crack. With the simultaneous crack lengths evaluated from DIC, the contribution of each fracture process to the crack propagation resistance at certain loading stage is quantitatively presented.
UR - http://www.scopus.com/inward/record.url?scp=85085340913&partnerID=8YFLogxK
U2 - 10.1016/j.jeurceramsoc.2020.05.047
DO - 10.1016/j.jeurceramsoc.2020.05.047
M3 - Article
VL - 40.2020
SP - 4655
EP - 4663
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
SN - 0955-2219
IS - 13
ER -
