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Development of a Distributed Crack Sensor Using Coaxial Cable.

Zhi Zhou1,2, Tong Jiao3,4, Peng Zhao5,6

  • 1School of Civil Engineering, Dalian University of Technology, Dalian 116024, China. zhouzhi@dlut.edu.cn.

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|August 3, 2016
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Summary

This study introduces an improved topology-based cable sensor for real-time structural crack monitoring. The novel sensor effectively detects small cracks and multiple crack events, offering a practical solution for structural health assessment.

Keywords:
coaxial cablecrackdistributed sensor

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Area of Science:

  • Structural Engineering
  • Materials Science
  • Sensor Technology

Background:

  • Cracks are critical indicators of structural damage and failure.
  • Traditional crack detection methods have limitations in installation, durability, and measurement range.
  • Real-time, distributed crack monitoring is essential for structural health assessment.

Purpose of the Study:

  • To propose and evaluate an improved topology-based cable sensor for crack monitoring.
  • To overcome the limitations of existing crack detection technologies.
  • To demonstrate the sensor's utility in practical structural applications.

Main Methods:

  • Development of a topology-based cable sensor with a shallow helical groove.
  • Numerical and experimental investigations of the sensor's sensing mechanism, fabrication, and performance.
  • In-situ crack monitoring experiments on reinforced beams.

Main Results:

  • The sensor can detect cracks with a minimum width of 0.02 mm.
  • It accurately measures multiple cracks with a spatial resolution of 3 mm.
  • The sensor effectively monitors crack initiation, development, and progression until structural failure.

Conclusions:

  • The proposed topology-based cable sensor offers a viable solution for distributed, real-time crack monitoring.
  • This technology enhances structural health assessment by providing precise crack detection and measurement capabilities.
  • The sensor demonstrates significant potential for practical applications in monitoring civil infrastructure.