Piezoelectric 0-0-3 Composites

结构健康监测的长期愿景是一个自给自足的运作。原则上，传感器可以用于能量采集，但相邻的复合结构也可以使用。能量可以在结构中积累，超出SHM系统的运行周期。这是提案的起点。其目的是研究与自给自足操作相关的能够集成到结构表面中的能量转换机制。该项目的重点在于研究能够在聚合物复合材料结构中将机械能转化为电能的压电树脂。建议者将建造一个测试设备，以确定最相关的压电参数，如介电常数、负载常数、耦合系数。将研究压电陶瓷颗粒和提高介电常数的添加剂(如碳改性)在树脂中的分散情况。将制造由颗粒和溅射电极组成的压电复合材料的试片。特别是，将考虑KNN等铅基陶瓷的替代品。在第二步中，将开发高粘度树脂系统在聚合物纤维复合材料中的集成。树脂膜灌注法(RFI)是一种非常有前途的候选方法。研究工作最具挑战性的任务将是如何将电极集成到复合结构中。通过多尺度模拟，可以对由压电粉和热固性树脂组成的压电聚合物复合材料有一个全面的认识。建立了一个有效的多尺度模型框架来定量预测颗粒填充树脂的机电行为，特别是颗粒数量与机电性能之间的关系。

The long term vision for Structural Health Monitoring is a self-sustaining operation. In principle the sensors may be used for energy harvesting, but the adjacent composite structure may be used as well. The energy can by accumulated in the structure beyond the operation cycle of the SHM-system. This is the starting point for the proposal. The aim is to investigate energy converting mechanisms capable of being integrated into the structural surface with respect to an autarkic operation. The focus of the project lies in the investigation of piezoelectric resins being able to convert mechanical into electric energy within polymer composite structures. The proposers will build a test facility for the determination of the most relevant piezoelectric parameter like permittivity, load constant, coupling factor. The dispersion of piezoceramic particles and additives elevating the permittivity, e.g. carbon modifications, into the resin will be investigated. Coupons of piezo-composites consisting of particles and sputtered electrodes will be manufactured. In particular alternatives to lead-based ceramics like KNN will be considered. In a second step the integration of the highly viscous resins systems in polymer fiber composites will be developed. Methods of Resin Film Infusion (RFI) are very auspicious candidate methods. The most challenging task of the research work will then be how to integrate the electrodes into the composite structure. A comprehensive understanding of piezo-electric polymer composites composed of piezoelectric powder and thermoset resin will be achieved by multi-scale modelling. A validated multi-scale modelling framework is pursued to quantitatively predict the electromechanical behaviour of the particle-filled resin, especially the relationship between amount of particles and electromechanical properties.