摘要
考虑压电振子的疲劳寿命与压电泵的使用寿命有关,本文对其疲劳寿命进行了分析研究。首先,对锆钛酸铅(PZT)陶瓷(文中使用PZT-5)在力电耦合场作用下发生疲劳破坏时的极限应力与循环次数之间的对应关系进行了数值测定,借助变异系数对所选子样个数的合理性进行了判别和修正。然后,经数据处理,得到置信度为95%、存活率为99.9%时PZT的安全寿命,p-S-N双对数曲线及其对应的线性回归方程,为压电振子的疲劳寿命计算提供了必要的数据基础。最后,利用ansys和miner疲劳损伤累积假说对某共振型气体压电泵用压电振子的疲劳寿命进行计算,结果显示其为4461h,此时的安全系数为1.25。得到的结果完善了共振型气体压电泵的技术参数,该疲劳曲线和计算方法也可应用到其它泵用PZT-5压电振子的疲劳寿命计算。
As the fatigue life of a piezoelectric actuator is relative to the service life of a piezoelectric pump, this paper carries out a fatigue life-related research. First, times of stress cycle corresponding to the ultimate stress is experimentally acquired when Pb（Zr, Ti）Oa （PZT-5）ceramics suffers from the fatigue failure under an electro-mechanical coupling field. The number of samples selected at different levels of stress in the above experiment are discriminated and corrected by using the coefficient of vari- ation. After data processing, a p-S-N double logarithm curve and its linear regression equation are ob- tained with the safety life at different levels of stress under conditions of 950% degree of confidence and 99.9% livability calculated respectively, which offers important and necessary data for the fatigue life calculation of piezoelectric actuator. Finally, the fatigue life of the piezoelectric actuator of a certain resonance-type air pump is calculated to be 4461 h with safety factor 1.25 by using ansys and hypothe- sis of fatigue damage accumulation. These results perfect the technical parameters of this air pump and the fatigue data, and the calculation method can be applied to the fatigue calculation of PZT-5 actuator in other kinds of piezoelectric pumps.
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2013年第4期941-947,共7页
Optics and Precision Engineering
基金
国家自然科学基金资助项目(No.51175213)
常州市应用基础研究计划资助项目(No.CJ20115014)
