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总览 评价 刘启达 1,* , 崔元虎 2, ( 1、 西安交通大学结构与强度重点实验室,西安 710049; 2、 西安交通大学结构与强度重点实验室; ) 摘要: 为研究空洞电学边界条件对铁电材料极化过程中的影响,首先采用晶体塑性有限元模型计算方法,分别计算了绝
刘启达1,*, 崔元虎2,
(
1、西安交通大学结构与强度重点实验室,西安 710049; 2、西安交通大学结构与强度重点实验室; )
摘要:
为研究空洞电学边界条件对铁电材料极化过程中的影响,首先采用晶体塑性有限元模型计算方法,分别计算了绝缘孔洞和导通孔洞边界在电场的非均匀蠕变行为;计算结果表明由于孔洞的电场集中效应两者电致蠕变极化速率远比没有孔洞夹杂快;但是由于两种孔洞电边界条件的差异导致在极化过程中的应变和极化强度的分布是不同的;计算结果得到了绝缘孔洞双折射试验的验证。
关键词:
铁电陶瓷;空洞夹杂;电边界条件;双折射
Liu Qida1,*, Cui Yuanhu2,
(
1、MOE Key Laboratory for Strength and Vibration, Xi’an Jiaotong University, Xi\'an 710049; 2、MOE Key Laboratory for Strength and Vibration, Xi’an Jiaotong University, 710049, P. R. China; )
Abstract:
The finite element method is used to study the creeping polarization and strains around a circular hole in the ferroelectric ceramics under various constant levels of electric field. Two kinds of electrical boundary conditions, the permeable and impermeable boundary conditions, are applied on the rim of the hole, while the evolution of strains and polarization distribution is computed around the hole. The strain and polarization distribution around the hole are significantly different for two conditions, which is confirmed by the birefringence measurement on PLZT specimen with an impermeable hole.
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