报 告  人：苏众庆教授(香港理工大学机械工程学系)

报告题目：Nanocomposites-inspired Diffused Sensing Network for Ultrasonic-wave-based Structural Health Monitoring

时      间：2018年5月25日（周五）上午9:30-11:00

地      点：国家纳米科学中心 南楼二层中会议室

邀 请 人：张忠 研究员

报告摘要：

With recognition of the bottlenecks of guided ultrasonic waves (GUWs)-based structural health monitoring (SHM) for composites, conventional polymer composites are nano-engineered and endowed with a capability of self-perceiving GUWs. Two-dimensional graphene nanoparticle-based sensing networks are formed, optimized, and diffused in fibre-reinforced polymers, in which the quantum tunneling effect can be triggered locally when GUWs traversing the composites. Notably, the diffused sensing networks make it possible to acquire GUWs at any site of the functionalized composites and avoid using of conventional ultrasonic sensors that have to be externally attached to or internally embedded in composites. With an optimized nano-structure, the composites have been demonstrated self-responsive to GUWs up to 1.4 MHz. In experimental validation, GUWs propagating in a glass fibre/epoxy laminate are self-sensed by the laminate at the sites arbitrarily selected, to observe no discrepancy against counterpart signals obtained with commercial piezoelectric sensors. To take a step further, barely visible impact damage (BVID) in the laminate committed via a drop test is located accurately using the self-sensed GUW signals. This study has spotlighted a new breed of functional composites with a capability of self-health monitoring without using external sensors and associated cables/wires. Not only does it facilitate a reduced weight and volume penalty to original composites, but minimizes possible mechanical degradation of the composites due to the intrusion of sensors, blazing a trail in developing “sensor-free” SHM for composites.

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