Design of CNT Embedded Adhesive Film for Sensing, Control, and Reinforcement of PZT Actuator/Sensor Networks in Multifunctional Composites During Cure.

摘要

Structures with the multifunctional capabilities of self-sensing, diagnostics, self-repair, and mitigation of damage have demonstrated many benefits and advantages over traditional structures, particularly in enhancing structural safety, reducing maintenance cost, and improving performance. The sensor is the most fundamental building block element that is needed for multifunctional structures. The integration of sensors in a network into structures involves serious challenges and difficulties. Although significant progress has been made in recent years, the durability and reliability of sensor networks for covering large structures remain a challenge. This research is proposed to develop a nano-technology to enhance the sensor-structure bond strength. We designed, characterized and tested a novel sensor-structure bond with the help of a composite nano-structured film. The key feature is the integration of oriented carbon nanotubes (CNTs), directly grown or implanted on the sensor (PZT), into the adhesive. The integration of the epoxy with oriented CNTs shows a potential improvement in the shear strength by comparison to commercial adhesives. This is because the oriented CNTs in the interface play a major role in the failure mechanism slowing down fracture propagation. The thin adhesive layer that bonds piezoelectric (PZT) sensors/actuators to a hosting structure has not been quantifiably assessed thus far. However, the health of the bondline is known to be critical to guarantee the performance and reliability of the underlying structural health monitoring system (SHM).