论文信息 - A structural health monitoring system for self-repairing

A structural health monitoring system for self-repairing

Shape memory alloy (SMA) washers expand axially when heated, and the expansion for the one-way type SMA is permanent even if the heat is removed. We investigated a method to repair bolted joint loosening defects using SMA washers. We incorporated such a feature into our impedance-based structural health monitoring (SHM) system. An SMA washer wrapped with a heater is installed between a bolt and the nut. Upon detection of a loosening defect, the heater is turned on to expand the SMA washer, which in turn repairs the defect. Our experimental results show that (i) our enhanced SHM system can detect bolted-joint loosening defects, and (ii) it can repair such defects effectively. Our system suggests that self-repairing of some structural defects is feasible without human interventions.

[1] Jina Kim,et al. Low-Power System Design for Impedance-Based Structural Health Monitoring , 2007 .

[2] Daniel J. Inman,et al. Practical issues of activating self-repairing bolted joints , 2004 .

[3] Jina Kim,et al. An All-Digital Low-Power Structural Health Monitoring System , 2007, 2007 IEEE Conference on Technologies for Homeland Security.

[4] Daniel J. Inman,et al. Self-repairing joints employing shape-memory alloy actuators , 2003 .

[5] Hoon Sohn,et al. Overview of Piezoelectric Impedance-Based Health Monitoring and Path Forward , 2003 .

[6] Daniel J. Inman,et al. Improving Accessibility of the Impedance-Based Structural Health Monitoring Method , 2004 .

[7] Gyuhae Park,et al. Self-healing bolted joint employing a shape memory actuator , 2001, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[8] Craig A. Rogers,et al. One-Dimensional Thermomechanical Constitutive Relations for Shape Memory Materials , 1990 .

[9] Dong Sam Ha,et al. A system-on-board approach for impedance-based structural health monitoring , 2007, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.