Improvement in Crack Detection by Ultrasonic Pulse-echo with Low Frequency Excitation

Abstract

The results of studies to determine the feasibility of inducing stress in metal samples with low frequency excitation have indicated that the effective use of this technique is limited to excitation in the cyclic frequency range of 1000 Hz and below. Best results were obtained with solid coupling of low frequency exciters to test material. Attempts to induce stress with excitation at 20 kHz were not very successful with the techniques and equipment used in these studies.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1970
Accession Number
AD0716642

Entities

People

  • John G. Sessler
  • Volker Weiss

Organizations

  • SRC Inc.

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Acoustic Impedance
  • Acoustic Waves
  • Calibration
  • Compression
  • Crack Tips
  • Detection
  • Frequency
  • Geometry
  • Impedance
  • Materials
  • Materials Science
  • Measurement
  • Mechanics
  • Reflection
  • Repetition Rate
  • Resonant Frequency
  • Tensile Stress

Readers

  • Radio communications and signal processing.
  • Structural Dynamics.
  • Structural Health Monitoring of Composite Structures.