Characterization of Electric Fracture and Fatigue Properties of Advanced Piezoelectric Material Systems

先进压电材料系统的电断裂和疲劳性能表征

基本信息

批准号：
14350048
负责人：
SHINDO Yasuhide
金额：
$ 10.82万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14350048/
关键词：
Elasticity Electric Facture Mechanics Integral Transforms Finite Element Analysis Material Testing Piezoelectric Ceramics Electro-Elastic Inelastic Interactions Smart and Electronic Material Systems

项目摘要

In most of the applications of sensors and actuators in the field of smart structures and devices, piezoelectric ceramics are subjected to both high mechanical stresses and electric fields hence, it is important for reliability and durability to investigate the fracture and fatigue properties of piezoelectric ceramics and composites under electromechanical loading. In this research project, the electromechanical properties of advanced piezoelectric material systems are investigated. From the theoretical considerations and experimental data for piezoelectric material systems, the following results can be obtained :1. We analyze the electroelastic problems for cracked piezoelectric material systems. The effect of electric field on the fracture mechanics parameters (energy release rate, energy density factor, fatigue crack growth rate) is calculated. We also develop a finite element procedure which allows to compute the polarization switching near the crack tip, and discuss the nonlinear … More fracture properties of piezoelectric material systems.2. (1) We perform the indentation fracture, single-edge precracked-beam, and double torsion tests on piezoelectric ceramics, and discuss the electric fracture properties. We also employ the nonlinear finite element analyses to study the effect of localized polarization switching on the fracture mechanics parameters. (2) We investigate the electric fracture and polarization switching properties of piezoelectric ceramics utilizing the modified small punch technique.3. We perform an experimental and analytical study on the static and cyclic fatigue properties of piezoelectric ceramics under electromechanical loading, using three-point bending method.4. (1) We study the effect of applied voltage on the electroelastic field concentrations ahead of electrodes in piezoelectric actuators. (2) We examine the electromechanical response of piezoelectric bimorphs, and discuss the effects of do electric field and polarization switching on the bending properties. We also present the results on the nonlinear behavior due to domain wall motion for laminated and functionally graded piezoelectric actuators under ac electric field. Less

在智能结构和设备领域的传感器和执行器的大多数应用中，压电陶瓷要承受高机械应力和电场，因此，研究压电陶瓷的断裂和疲劳性能对于可靠性和耐用性非常重要。在本研究项目中，从压电材料系统的理论考虑和实验数据出发，研究了先进压电材料系统的机电性能，得到了以下结果： 1．我们还开发了一种有限元程序，可以计算电场对断裂力学参数（能量释放率、能量密度因子、疲劳裂纹扩展率）的影响。 (1)对压电陶瓷进行了压痕断裂、单边预裂梁和双扭转试验，并讨论了电断裂性能。我们还利用非线性有限元分析研究了局部极化切换对断裂力学参数的影响。(2)利用改进的小冲头技术研究了压电陶瓷的电断裂和极化切换特性。3．采用三点弯曲法对压电陶瓷在机电载荷作用下的静态和循环疲劳性能进行了分析研究。 (1)研究了外加电压对压电陶瓷电极前方电弹性场集中的影响。 (2) 我们研究了压电双压电晶片的机电响应，并讨论了电场和极化切换对弯曲特性的影响，我们还介绍了层压和功能梯度压电陶瓷的磁畴壁运动引起的非线性行为的结果。交流电场下的执行器。