【作者】 吴爱军；

【导师】 谈梅兰； 顾建祖； 骆英；

【作者基本信息】 江苏大学 ， 固体力学， 2007， 硕士

【摘要】 1-3型压电复合材料既具有PZT高压电性能，又具有聚合物的低声阻抗、一定柔韧性等特点，是近年来研究最多的一种压电纤维复合材料，其优越的独特的性能在声学、医疗、控制、航空航天等领域得到了广泛的应用。同样，压电纤维复合材料传感元件是声发射技术中(AE)普遍采用的元件。有鉴于此，本文针对1-3型压电纤维复合材料的传感性能进行了理论仿真，试验并制作出压电纤维复合材料元件，进行了其传感性能测试等方面的研究。主要的工作内容如下：1．简要介绍了压电效应的基础知识和理论；论述了有限单元法在压电复合材料分析中的基本理论和方法，及其一般步骤。2．基于有限单元法对压电纤维复合材料进行了初步的静力学分析，重点分析了影响复合材料性能的几个因素：压电纤维直径、分支电极间距、分支电极面的宽度、压电相和聚合物相的体积比，以及两相材料的几个物理量，如弹性模量、泊松比、介电常数等。通过计算仿真初步得出，采用直径较小的压电纤维，较宽的分支电极间距、较窄的分支电极面和一定的体积比，可以获得较好的传感性能，而两相材料的物理参量对复合材料性能影响较小。基于计算结论，建立了一些实体模型。3．探讨出一套简单实用制作复合材料的工艺流程。研制出高性能压电纤维，设计并制作了铜交叉电极，较为成功的进行了材料的复合、固化、热极化、封装成型等一系列试验。4．对压电纤维复合材料元件进行传感性能和驱动性能以及正交异性等特性的测试。结果表明压电纤维复合材料具有显著的正交异性特性，良好的传感性能和驱动件能。更多还原

【Abstract】 1-3 piezoelectric composite material has as the same as PZT’s high piezoelectricity performance, as the polymer’s low acoustics impedance. It is one of the most piezoelectricity composite materials studied. The predominant and unique porformance has been broadly used in many spheres: acoustics, medical treatment, control, aeronautics and astronautics. Also, Piezoelectric sensor has been widely adopted for it’s excellence in AE testing. Now 1-3 sensor/actuator of piezoelectricity composite material is one of composite materials transducers that have been researched most thoroughly and most commonly applied. With this background, the theory and experimentation about piezoelectricity ceramics composite materials shaped in fiber are studied in this paper. The main contents of this dissertation are following.1．The basic information and theories of piezoelectric effects are concisely introduced. The fundamental theory and common practice of finite element in studying piezoelectric materials are presented.2．Based on FE method, piezoelectric fiber composite materials are primary statically analyzed, and the analyses are focused on the key points that influence the performance of composite materials. For example, the size of piezoelectricity fiber’s section, space between offset electrodes, width of offset electrodes, volume ratio of piezoelectricity and polymer, as well as two materials’ several physical quantities, such as elastic modulus, poison’s ratio, permittivity, and so on. Based on the results gained by the ANSYS FE imitated software, some entity modes are established.3．The fabrication of composite materials is experimentally studied using the analytical results and model data. The following are the main work: developing high performance piezoelectric fiber; designing and making copper interdigitated electrodes; the entire materials being composed, solidified, thermally polarized, encapsulation molding etc, a series of experimentation. 4．By filtrating detection, piezoelectric fiber composite material elements eligible to demarcate on the AE technology are found, and the performance of this kind of elements on orthotropic characteristic, sensor, actuator performance, etc are tested.更多还原