Detection of Bolt Stress Relaxation in Hybrid Bolted Connections

Abstract

The effort summarized in this report focuses upon real time detection of stress relaxation in bolted connections in hybrid structures. A proof-of-concept test bed for this effort consists of a 24-1/2 inch square plate made of Eglass/vinyl ester composite. Several interrogation techniques were employed and compared including: 1) low frequency modal analysis; 2) high frequency transfer functions and 3) high frequency transmittance functions. Each of these techniques employed a piezoelectric actuator bonded to the panel so to deliver a characterized disturbance in a controlled manner. The technique using transmittance functions to evaluate changes in bolt tensioning level shows the most promise.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 2003
Accession Number
ADA415171

Entities

People

  • Richard Mewer
  • Senthil S. Vel
  • Vincent Caccese

Organizations

  • University of Maine

Tags

Communities of Interest

  • Ground and Sea Platforms
  • Sensors

DTIC Thesaurus Topics

  • Biocomposites
  • Ceramic Materials
  • Composite Materials
  • Detection
  • Detectors
  • Engineering
  • Engineers
  • Frequency
  • Hulls (Marine)
  • Literature Surveys
  • Materials
  • Measurement
  • Modal Analysis
  • Piezoelectric Effect
  • Piezoelectric Materials
  • Resonant Frequency
  • Strain Gages

Readers

  • Mechanical Engineering/Mechanics of Materials.
  • Robotics and Automation.
  • Spectroscopy.