This paper is concerned with recent applications of ultrasonic acoustic waves to characterize fatigue crack propagations in "part-through-crack" (PTC) specimens. A simple ultrasonic system recently developed is described in detail. Emphasis given to the practical aspects of instrumentation and operation of this system which is based on the interaction of cracks with acoustic surface waves. The received signal contains information of the character of a static or a propagating crack. The sensitivity of the system mainly due to its high-resolution power makes it particularly suitable for studying plasticity effects in fatigue crack propagations. Of special importance, the present technique provides direct, experimental evidence on the crack-closure phenomenon and convenient means for measuring the amount of this closure, together with its associated crack-tip resistance. The significance of these parameters is discussed in terms of analytic predictions based on the residual deformations at the crack tip.

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  • Corporate Authors:

    Society for Experimental Stress Analysis

    21 Bridge Square
    Westport, CT  United States  06880
  • Authors:
    • Ho, C L
    • Marcus, H L
    • Buck, O
  • Publication Date: 1974-1

Media Info

  • Features: References;
  • Pagination: p. 42-48
  • Serial:
    • Experimental Mechanics
    • Volume: 14
    • Issue Number: 1
    • Publisher: Society for Experimental Mechanics
    • ISSN: 0014-4851

Subject/Index Terms

Filing Info

  • Accession Number: 00054881
  • Record Type: Publication
  • Source Agency: Shock and Vibration Digest
  • Files: TRIS
  • Created Date: Jul 15 1974 12:00AM