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

• 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; Elasticity; Electric Facture Mechanics; Integral Transforms; Finite Element Analysis; Material Testing; Piezoelectric Ceramics; Electro-Elastic; Inelastic Interactions; Smart and Electronic Material Systems

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中传感器和执行器的大多数应用中，压电陶瓷均受到高机械应力和电场的影响，因此，在电子机械载荷下，研究压电陶瓷和组合物的断裂和疲劳特性对于可靠性和耐用性很重要。在该研究项目中，研究了晚期压电材料系统的机电特性。根据压电材料系统的理论考虑和实验数据，可以获得以下结果：1。我们分析了破裂的压电材料系统的电弹性问题。计算电场对断裂机械参数的影响（能量释放速率，能量密度因子，疲劳裂纹生长速率）。我们还开发了一个有限的元件程序，该过程允许计算裂纹尖端附近的极化开关，并讨论非线性……压电材料系统的更多断裂特性。2。 （1）我们在压电陶瓷上执行压痕骨折，单边的延伸梁和双重扭转测试，并讨论电断裂性能。我们还采用非线性有限元分析来研究局部极化转换对断裂力学参数的影响。 （2）我们利用修改后的小打孔技术研究了压电陶瓷的电断裂和极化开关特性。3。我们使用三点弯曲方法对压电陶瓷的静态和周期性疲劳性质进行了实验和分析研究。4。 （1）我们研究了在压电执行器中电子之前的应用电压对电弹性场浓度的影响。 （2）我们检查了压电双臂形的机电响应，并讨论了电场和极化转换对弯曲特性的影响。我们还为非线性行为介绍了由于在交流电场下层压和功能分级的压电执行器而导致的非线性行为。较少的