Reliability of flexural strength and subcritical crack growth of two kinds of zirconia ceramics
10.3969/j.issn.1001-3733.2015.05.003
- VernacularTitle:2种牙科氧化锆陶瓷材料的弯曲强度可靠性和亚临界裂纹扩展研究
- Author:
Xu GONG
;
Xinyi ZHAO
;
Chunbao ZHANG
;
Shibao LI
;
Lijuan SHEN
;
Bing WU
;
Lihui TANG
;
Yulu WU
- Publication Type:Journal Article
- Keywords:
Dental zirconia ceramic;
Weibull statistics;
Flexural strength;
Cyclic fatigue;
Subcritical crack growth;
The stress corrosion cracking susceptive indexes
- From:
Journal of Practical Stomatology
2015;(5):611-614
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To evaluate the reliability of flexural strength and subcritical crack growth(SCG)of WL and HT zirconia ce-ramics under cyclic loading.Methods:Bar-shaped speciments of WL(n =30)and HT(n =30)were fabricated and loaded in three-point bending and cyclically fatigued.The flexural strength and the number of cycles to fracture were obtained from three-point flexural test and cyclic fatigue test respectively.Data were examined using Weibull statistics.Pairs law was used to analysize the subcritical crack growth(SCG),the behavior of which was described in terms of crack velocity as a function of maximum stress intensity factor (KImax ).Results:The Weibull module(m)of WL and HT was 10.64 and 12.04,the stress corrosion cracking susceptive indexes(n) 23.71 and 32.87,the SCG 90% and 76.7%,the KImax 49.6% and 50.9% of its maximum stress intensity factor(KIC ),respectively. Conclusion:WL and HT produce pronounced SCG.The minimum fatigue crack growth rate of HT is lower than that of WL(νHT <νWL ).
