Internal Damage Detection and Assessment in Beams Using Experimental Natural Frequencies

Abstract

This study investigated the frequency response of a cantilever beam with the intent of establishing a reliable nondestructive method of damage detection. The test specimens were 12 aluminum 2024 T3 beams, each identical except for a unique, eccentrically located notch, and one reference notchless beam. The machined notches varied in length and location to simulate varying degrees of damage. Laser doppler vibrometry enabled the data acquisition. The changes in natural frequencies were correlated to notch length and notch location. A comparison of eccentric and centered notch influence on the natural frequencies also is discussed.

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Document Details

Document Type
Technical Report
Publication Date
Jun 13, 2005
Accession Number
ADA438396

Entities

People

  • Frances K. Durham

Organizations

  • Air Force Institute of Technology

Tags

Communities of Interest

  • Biomedical
  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Acoustic Horns
  • Air Force
  • Damage Detection
  • Data Acquisition
  • Department Of Defense
  • Detection
  • Detectors
  • Eigenvalues
  • Finite Element Analysis
  • Frequency Response
  • Junction Boxes
  • Laser Doppler Vibrometers
  • Measurement
  • Modal Analysis
  • Modulus Of Elasticity
  • Resonant Frequency
  • Stress Waves

Fields of Study

  • Engineering

Readers

  • Radar Systems Engineering.
  • Structural Dynamics.
  • Structural Health Monitoring of Composite Structures.

Technology Areas

  • Directed Energy