Non-linear Constitutive Thermo-Electro-Mechanical Behavior of Piezocermics: Experimental Investigation

压电陶瓷的非线性本构热机电行为：实验研究

• 批准号: 5416074
• 负责人: Professor Dr.-Ing. Marc Kamlah, since 4/2007
• 金额: --
• 依托单位: Karlsruher Institut für Technologie (KIT)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2004
• 资助国家: 德国
• 起止时间: 2003-12-31 至 2008-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5416074?language=en
• 关键词: Non; linear; Constitutive; Thermo; Electro

Relatively poor reliability has become the main obstacle in preventing the breakthrough of piezoceramic materials into a broad field of applications. This problem is intensified by the fact that modern transducers normally have complicated structures and work under severe loading conditions. Due to their inherent ferroelectric and ferroelastic properties, the real response of piezoceramics under large signal loading is dominated by significantly non-linear behavior. The main objective of this project proposed here is to experimentally investigate the large signal non-linear constitutive properties of piezoceramics under uni-axial and multi-axial electromechanical loading conditions at different temperature levels. To further the understanding of the observed phenomena caused by underlying microscopic mechanisms, macroscopic measurements will be supplemented by microscopic analysis of the domain structure and phase state. The systematic thermo-electro-mechanical experimental data obtained in this project are the foundation for the development of suitable constitutive models serving as a basis for the reliability assessment of piezoceramic components.

相对较差的可靠性已成为阻碍压电陶瓷材料突破广泛应用领域的主要障碍。现代传感器通常具有复杂的结构并且在恶劣的负载条件下工作，这一事实加剧了这个问题。由于其固有的铁电和铁弹性特性，压电陶瓷在大信号负载下的实际响应主要由显着的非线性行为决定。这里提出的该项目的主要目标是通过实验研究压电陶瓷在不同温度水平的单轴和多轴机电加载条件下的大信号非线性本构特性。为了进一步理解由潜在微观机制引起的观察到的现象，宏观测量将通过域结构和相态的微观分析来补充。该项目获得的系统热机电实验数据是开发合适本构模型的基础，作为压电陶瓷元件可靠性评估的基础。