Combined damaged elasticity and creep modeling of ceramics with wedge splitting tests. Issue 18 (15th September 2021)

• Record Type: Journal Article
• Authors: Samadi, S.; Jin, S.; Harmuth, H.
• Is Part Of: Ceramics international. Volume 47:Issue 18(2021)
• Page Start: 25846
• Page End: 25853
• Publication Date: 2021-09-15
• Subjects: Mode I fracture -- Creep -- Material constitutive model -- Wedge splitting test; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.05.315
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: During the crack propagation in common refractory ceramics at high temperatures, creep may occur in the wake of a process zone and in front of a crack tip. To account for this phenomenon, an integrated material constitutive model was developed by combining the mechanical behavior following isotropic damaged elasticity concept and Norton-Bailey creep. The post peak fracture behavior followed the bilinear softening law and a simple criterion was defined to consider the creep asymmetricity in uniaxial tension and compression. The material constitutive model was applied to inversely identify mode I fracture parameters with wedge splitting tests of an alumina spinel material at 1200 °C. It showed that the mean ratio of the nominal notch tensile strength to the actual tensile strength was 1.93 and the mean pure fracture energy was 297.6 N/m. In addition, the creep contributed 12.9% on average into the total fracture energy.