STARTER CRACKS FOR FRACTURE TOUGHNESS TESTING BY A RESONANCE FATIGUE TECHNIQUE.

Abstract

A technique was developed for introducing fatigue cracks of a predetermined size automatically in specimens using a reverse bending resonance machine. The drop in the resonant frequency of vibration reflects the growth of cracks and it is by means of the change in frequency that the size of cracks is controlled. This technique has applicability in mechanical testing in which are required specimens containing pre-existing flaws or cracks, such as fracture toughness testing, and in studies of crack propagation. (Author)

Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1966
Accession Number
AD0630871

Entities

People

  • H. H. Smith
  • M. R. Achter
  • P. Shahinian

Organizations

  • United States Naval Research Laboratory

Tags

DTIC Thesaurus Topics

  • Crack Propagation
  • Cracks
  • Frequency
  • Frequency Shift
  • Mechanical Waves
  • Motion
  • Resonance
  • Resonant Frequency
  • Toughness
  • Vibration
  • Waves

Fields of Study

  • Engineering

Readers

  • Control Systems Engineering.
  • Materials Science (Mechanical Engineering).