Strain-based structural health monitoring

Branko Glisic, Princeton University, Marcus Perry, University of Strathclyde 

A material will fail when its strength is exceeded by the stress at any point. There are, however, few effective means of directly monitoring stress in real-life settings. Strain, on the other hand, is intrinsically measurable as it produces repeatable and reversible changes in many electrical, optical and acoustic sensor devices. Strain is a parameter directly correlated to stress, and so any change in the stress field is reflected through a change in the strain field. In addition, the first signs of damage to a structure often have local characteristics that occur in the form of strain-field anomalies (e.g., cracking, crushing, yielding, bowing, etc.), while at a global level, deformation remains an excellent indicator of performance. Consequently, strain has emerged as an important parameter to monitor, and strain-based SHM has been researched and implemented in many real-life structures. The aim of this session is to present recent advancements in research and applications of strain-based SHM. Contributions on sensor technology innovation and analysis methods are both welcome.

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