Investigation of bulk material property changes and fatigue strength determination of relaxor-PT piezoelectric materials

弛豫-PT压电材料块体材料性能变化研究及疲劳强度测定

• 批准号: RGPIN-2015-05791
• 负责人: Garland, Philip
• 金额: $ 1.68万
• 依托单位: University of New Brunswick
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=651542
• 关键词: Investigation; bulk; material; property; changes

Solid solution relaxor-PT piezoelectric single crystals have generated considerable interest since first being successfully grown in the 1990s due to electromechanical coupling close to the theoretical maximum and piezoelectric voltage-strain coefficients much higher than traditional PZT ceramics. While significant research effort has focused on these bulk property values for different compositions and crystal orientations of several relaxor-PT materials, there has been a lack of systematic investigation of how these properties change under different boundary conditions and inputs, as well as fatigue data. The proposed research project has two main goals. The first is to investigate the material property values for relaxor-PT single crystals under various boundary conditions and cyclic loading using the inverse method. The second goal is to determine fatigue strength values using experimental data and nominal stress state determinations. The two outcomes, namely changing material property values under service and material strength characteristics, will aid designers in designing longer lasting piezoelectric devices with improved performance. **

固溶弛豫-PT 压电单晶自 20 世纪 90 年代首次成功生长以来，由于其机电耦合接近理论最大值，且压电电压应变系数远高于传统 PZT 陶瓷，因此引起了人们极大的兴趣。虽然大量的研究工作集中在几种弛豫-PT材料的不同成分和晶体取向的这些整体特性值上，但缺乏对这些特性在不同边界条件和输入以及疲劳数据下如何变化的系统研究。拟议的研究项目有两个主要目标。首先是使用反演方法研究不同边界条件和循环载荷下弛豫-PT 单晶的材料性能值。第二个目标是使用实验数据和标称应力状态确定来确定疲劳强度值。这两个结果，即改变使用条件下的材料性能值和材料强度特性，将有助于设计人员设计出性能更持久、性能更佳的压电器件。 **