Stress intensity factor and fatigue crack propagation assessment of mode-I failure in alumina-calcium hexaluminate refractories
Guanglin Dong,
Liping Pan,
Tian Huang,
Yichen Chen,
Ning Liao,
Tianbin Zhu,
Qinghu Wang,
Sijia Liang,
Jun Xu,
Yu Wang
Affiliations
Guanglin Dong
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China; National-provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, Wuhan University of Science and Technology, Wuhan, 430081, China
Liping Pan
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China; National-provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, Wuhan University of Science and Technology, Wuhan, 430081, China; Corresponding author. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China.
Tian Huang
Geotechnical Institute, TU Bergakademie Freiberg, 09599, Freiberg, Germany
Yichen Chen
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China; National-provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, Wuhan University of Science and Technology, Wuhan, 430081, China
Ning Liao
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China; National-provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, Wuhan University of Science and Technology, Wuhan, 430081, China
Tianbin Zhu
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China; National-provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, Wuhan University of Science and Technology, Wuhan, 430081, China
Qinghu Wang
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China; National-provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, Wuhan University of Science and Technology, Wuhan, 430081, China
Sijia Liang
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China; National-provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, Wuhan University of Science and Technology, Wuhan, 430081, China
Jun Xu
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China; National-provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, Wuhan University of Science and Technology, Wuhan, 430081, China
Yu Wang
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China; National-provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, Wuhan University of Science and Technology, Wuhan, 430081, China
Alumina-calcium hexaluminate refractories experience crack development under severe conditions, leading to a significant reduction in mechanical strength. The external finite element method and Paris' law were employed to investigate the effects of external load and in-situ crack length on stress intensity factor. Fatigue life and crack propagation process of refractories were simulated for varying CAx contents under Model I failure. The findings revealed a linear correlation between the stress intensity factor and external load for a fixed in-situ crack length (a≤16 mm). The ultimate strength of alumina-calcium hexaluminate refractories is inversely proportional to the in-situ crack length. The material's microstructure significantly influences the ultimate strength of refractories, whereas the crack propagation ratio at the interface-to-the aggregate level strongly affects fatigue life. Refractories with a CAx content of 29.78% exhibit the longest fatigue life, attributed to the favorable formation of CA6/CA2 and the highest interface-to-aggregate crack propagation ratio.
