Fracture characterization of ceria partially stabilized zirconia using the GMTSN criterion. (August 2018)

• Record Type: Journal Article
• Authors: Ghouli, S.; Ayatollahi, M.R.; Bushroa, A.R.
• Is Part Of: Engineering fracture mechanics. Volume 199(2018)
• Page Start: 647
• Page End: 657
• Publication Date: 2018-08
• Subjects: Ceramics -- CeO2-TZP -- Fracture properties -- Strain-based fracture criterion; Fracture mechanics -- Periodicals; Rupture, Mécanique de la -- Périodiques; Fracture mechanics; Periodicals; 620.112605
• DOI: 10.1016/j.engfracmech.2018.06.037
• Languages: English
• ISSNs: 0013-7944

Abstract

Highlights: The generalized maximum tangential strain (GMTSN) criterion is revisited. The influence of T-term on crack initiation angle and onset of fracture is studied. Fracture behavior of CeO2 -TZP disk specimens is predicted using the GMTSN criterion. The results of the GMTSN criterion and classical fracture criteria are then compared. Improved correlation with experiments is observed when using the GMTSN criterion. Abstract: Ceria stabilized tetragonal zirconia polycrystal (CeO2 -TZP) is one of the zirconia-based materials which is reported to have high fracture toughness and strong resistance to low temperature aging degradation (LTAD). Owing to the brittle behavior of CeO2 -TZP, its fracture properties can be estimated using the concept of linear elastic fracture mechanics (LEFM). In this paper, the generalized maximum tangential strain (GMTSN) criterion is applied to predict the fracture initiation angles and the onset of fractures of CeO2 -TZP disk specimens under mixed mode I/II conditions. It is found that the inclusion of T-term, the first non-singular term in strain solution, in the GMTSN criterion would yield significantly improved predictions of the experimental data obtained for CeO2 -TZP disk specimens and reported in the literature.