Nondestructive Evaluation of Cooperative Structures (NDECS)
Systems and System Design
Sensor/Actuator Network Configuration
Published Online: 15 SEP 2009
Copyright © 2009 John Wiley & Sons, Ltd. All rights reserved.
Encyclopedia of Structural Health Monitoring
How to Cite
Balageas, D. L. 2009. Nondestructive Evaluation of Cooperative Structures (NDECS). Encyclopedia of Structural Health Monitoring.
- Published Online: 15 SEP 2009
Structural health monitoring (SHM) is born from the conjunction of several techniques and has common basis with nondestructive evaluation (NDE). Several NDE techniques can be converted into SHM techniques by integrating the sensors and the actuators inside the monitored structure. NDE is mature, since several decades of research and development have been made. On the contrary, SHM has just begun to come out of the laboratories, and its applications at a wide scale remain a long-term objective. Under these conditions, we may wonder whether an intermediate way, less performing but feasible at a shorter term, would be an attractive and relevant option.
This third way may consist, first in using Lamb wave propagation as the physical phenomenon allowing to establish a diagnostic, and second, in coupling a few localized piezoelectric transducers embedded at well-chosen locations into the structure and using outside the structure noncontact, full-field, quasi-real-time optical detection or excitation systems.
Such techniques are already available and could be applied short term, permitting time and money to be saving for maintenance operations. A well-suited appellation for this type of technique is proposed: nondestructive evaluation of cooperative structures (NDECS). Three possible NDECS systems are presented: stroboscopic shearography, lock-in infrared thermography, and scanned laser ultrasonics.
- Lamb waves;
- laser ultrasonics;
- lock-in infrared thermography;
- NDECS (nondestructive evaluation of cooperative structures);