United States Department of Transportation
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Investigating the Effects of Corrosion Resistant Coating on the Ductility of Welded Wire Reinforcement
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2016-01-01
[PDF-2.19 MB]
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Edition:Final Report
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Abstract:In a previous UTC project, a prototype of a novel multi‐sensor sheet, called sensing sheet was developed. This sheet is based on technology called large‐area electronics (LAE) and consists of dense arrays of sensors supporting several different electronic components (interconnects, circuits, batteries, etc.) that are patterned or laminated on a polyimide substrate. It has potential to cover large areas of structures and reliably identify the damage occurring virtually at any location within the sheet. The sensing sheet contains dense array of individual sensors, but there are some non-instrumented spaces between the sensors that are not directly sensitive to strain anomalies. In addition, individual sensors are sensitive to strain in one specific direction, while the damage (e.g., cracking of concrete and bowing of steel), can generate strain field anomalies that do not necessarily occur in the same direction. If the sensor network is not designed correctly, all these effects can potentially lead to unsuccessful damage identification. To address the above challenges, probabilistic approaches are needed to establish a sensor network within LAE based on the probability that this particular network can detect a damage of a certain size (probability of detection). Thus, the objective of this project was to create methodology for design of sensor network for LAE sensing sheets that will enable reliable identification of damage of a given size. The outcomes include (1) the methodology for determination of (a) arrangement of sensors and (b) probability of detection, and (2) practical guidelines with associated "probability of detection" diagrams for the most frequent types of damage. The project description and outcomes are presented in detail in the report.
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