This study aimed to characterize the fatigue behavior using two fatigue methods, boundary and staircase, and to predict the probability of failure (P_f) of zirconia-reinforced lithium silicate glass-ceramic (ZLS). Bar-shaped specimens of ZLS (18 ×4 ×1.2 mm) were fabricated. Thirty specimens were subjected to a three-point flexural strength test using a universal testing machine with 0.5 mm/min crosshead speed, in 37 °C distilled water. Flexural strength data were analyzed with Weibull statistics. Eighty-six bars were subjected to cyclic fatigue using boundary and staircase methods. Fatigue tests were performed in a pneumatic cycling machine (2 Hz, 37 °C distilled water) for 10 ³ and 10⁴ cycles. Fatigue data were analyzed using an inverse power law relationship and log normal-lifetime distribution. Fracture toughness (K_Ic) was determined using V-notched specimens (18 ×4 ×3 mm) and the short beam toughness method (n = 7). Vickers hardness (VH) was evaluated (4.9 N, 20 s). Fractographic and EDS analyses were also performed. ZLS showed a characteristic strength of 197 MPa, Weibull modulus of 4, VH of 6.67 GPa and K_Ic of 1.93 MPa m^1/2. After 10³ cycles, for both methods, there was a degradation of 78% of the initial strength. There was no significant degradation when the number of cycles increased from 10³ to 10⁴. Both methods resulted in similar P_f and precision at 40 MPa (~50% P_f). Yet, staircase shows good accuracy and precision in predicting the stress amplitude for a P_f near 50%; while boundary is also effective for P_f lower than 50%. The fatigue methods evaluated show similar accuracy and precision for predicting the P_f of a glass-ceramic when simulations were made in the range of stress levels and lifetimes used in the fatigue tests.

这项研究旨在使用边界和阶梯两种疲劳方法表征疲劳行为，并预测氧化锆增强硅酸锂玻璃陶瓷（ZLS）的失效概率（P _f）。制作了ZLS的棒状标本（18×4×1.2 mm）。使用万能试验机，以0.5 mm / min的十字头速度，在37°C的蒸馏水中对30个样品进行三点弯曲强度测试。弯曲强度数据用威布尔统计分析。使用边界和阶梯方法对86根钢筋进行了循环疲劳。在气动循环机（2 Hz，37°C蒸馏水）中进行了10³和10 ^4的疲劳测试周期。使用逆幂定律关系分析疲劳数据，并记录正态寿命分布。使用V型缺口试样（18×4×3 mm）和短梁韧性方法（n = 7）确定断裂韧性（K _Ic）。评价了维氏硬度（VH）（4.9 N，20 s）。分形和EDS分析也进行了。ZLS的特征强度为197 MPa，威布尔模量为4，VH为6.67 GPa，_KIc为1.93 MPa m ^1/2。在10 ³个循环之后，两种方法的初始强度均降低了78％。当循环数从10 ³增加到10 ⁴时，没有明显的降解。两种方法均得出相似的P _f精度为40 MPa（〜50％P _f）。然而，楼梯在预测P _f接近50％的应力幅度时显示出了良好的精度和精确度。边界对于P _f小于50％也是有效的。当在疲劳测试中使用的应力水平和寿命范围内进行模拟时，所评估的疲劳方法在预测玻璃陶瓷的P _f时显示出相似的精度和精确度。