生物陶瓷材料的疲劳寿命预测

Prediction of fatigue lifetime in bio-ceramics

采用断裂力学中的四点弯曲试验法,研究并预测了氧化铝和氧化锆陶瓷材料在大气和水环境中的循环疲劳破坏特性.结果表明,在相同的应力条件下,氧化铝和氧化锆陶瓷材料,尤其是氧化锆陶瓷,在水环境中的疲劳寿命比大气中的低.通过将预测结果与实验结果比较和对人造股关节的应用,验证了这种疲劳寿命预测方法的有效性和适用性.

The characteristics of cyclic fatigue fracture were studied by the crack growth tests using the four-point bending method in both environments of air and water for alumina and zirconia ceramics. The effect of water environment on the fatigue lifetime was investigated. The results showed that in the case of the same stress applied, the time to fracture in water is less than that in air, and it is more remarkable for zirconia. The fatigue lifetime predictions agree qualitatively with the experimental results for cyclic fatigue of alumina and zirconia in air and water environments, and the method of the fatigue lifetime prediction was applied to artificial hip joint.