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Early Bolt Loosening Detection Method Based on Digital Image Correlation.

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  • 1School of Mechanical Engineering, Yangtze University, Jingzhou 434023, China.

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Summary
This summary is machine-generated.

Early detection of bolt loosening is vital for equipment safety. A new digital image correlation method accurately predicts bolt axial force, preventing failures in high-pressure pipe manifolds.

Keywords:
average strainaxial loaddigital image correlationearly bolt loosening assessment

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Area of Science:

  • Mechanical Engineering
  • Materials Science
  • Structural Health Monitoring

Background:

  • Bolt loosening critically affects equipment accuracy, stability, and safety.
  • Timely detection is essential for reliability, performance, and service life.
  • Existing methods like strain gauges and ultrasonic waves have limitations.

Purpose of the Study:

  • To propose an early bolt loosening detection method for high-pressure pipe manifolds.
  • To enable early assessment of bolt loosening and prevent leakage accidents.
  • To offer a novel approach for structural health monitoring.

Main Methods:

  • Establishing a tensile test model relating average strain to axial force.
  • Capturing industrial camera images of bolts with random speckles under operational conditions.
  • Utilizing digital image correlation to calculate average strain on the bolt head side.

Main Results:

  • A strong linear relationship was observed between average strain and axial force.
  • The method accurately predicts bolt axial force under operational conditions.
  • Early bolt loosening can be effectively assessed.

Conclusions:

  • The digital image correlation method provides accurate bolt axial force prediction.
  • This technique offers a new approach for early bolt loosening detection in high-pressure manifolds.
  • It enhances structural health monitoring capabilities.