Research On Design Analyses, Fabrication And Performance Testing For Sensors Of Orthotropic Piezoelectric Fiber Composite Material

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.