| 铁电陶瓷电致疲劳失效的研究进展 |
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| 引用本文： | 耿黎明,杨卫.铁电陶瓷电致疲劳失效的研究进展[J].力学进展,2007,37(2):225-232. |
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| 作者姓名： | 耿黎明 杨卫 |
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| 作者单位： | 清华大学工程力学系,北京,100084 |
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| 基金项目： | 国家自然科学基金，国家重点基础研究发展计划(973计划) |
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| 摘 要： | 铁电陶瓷是具备力电转换功能的典型高技术材料.本文概述铁电陶瓷电致疲劳失效的
研究进展.首先介绍电致疲劳的定义和特点,然后讨论电致疲劳失效在不同尺度下的表现行
为,包括宏观尺度下裂纹的疲劳扩展;细观尺度下裂纹的萌生;微观尺度下点缺陷在循环电
场下的积聚.随即阐述了铁电陶瓷在循环电场下缺陷汇聚的理论分析,运用微结构演化方法
计算了单个孔洞随畴界的移动距离,推导了循环电场下铁电陶瓷内点缺陷浓度的演
化方程,给出了点缺陷浓度与其汇聚程度之间的定量关系,从而提出了贯通不同尺度的铁电陶瓷电致
疲劳失效机理.
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| 关 键 词： | 铁电陶瓷 电致疲劳 疲劳裂纹 畴变 点缺陷汇聚 |
| 收稿时间： | 2006-05-18 |
| 修稿时间： | 2006-05-182006-12-21 |
ELECTRICALLY INTRODUCED FATIGUE OF FERROELECTRIC CERAMICS |
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| GENG Liming,YANG Wei.ELECTRICALLY INTRODUCED FATIGUE OF FERROELECTRIC CERAMICS[J].Advances in Mechanics,2007,37(2):225-232. |
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| Authors: | GENG Liming YANG Wei |
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| Institution: | Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China |
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| Abstract: | Researches on electrically introdued fatigue of ferroelectric ceramics are reviewed in the present paper.It's definition,characteristics and behavors at different scales are introdued,including the growth of fatigue cracks,initiation of microcracks,and agglomeration of point defects.The theory of point defect agglomeration under the cyclic electric field is briefly described.The moving distance of a single void under domain switchings is calculated by the theory of microsructural evolution.The evolution function of point defect concentration in ferroelectric ceramics is derived under the cyclic electric field.The quantitive relationship of point defect concentration and their agglomeration extent are given.The mechanism of electric fatigue of ferroelectric ceramics is elucidated at different scales. |
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| Keywords: | ferroelectric ceramics electrically introduced fatigue fatigue cracks domain switch point defect agglomeration |
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