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Journal of Materials Science

, Volume 27, Issue 12, pp 3133–3142 | Cite as

Acoustic emission during fatigue of Ti-6Al-4V: Incipient fatigue crack detection limits and generalized data analysis methodology

  • D. H. Kohn
  • P. Ducheyne
  • J. Awerbuch
Papers

Abstract

The fundamentals associated with acoustic emission monitoring of fatigue crack initiation and propagation of Ti-6Al-4V were studied. Acoustic emission can detect and locate incipient fatigue crack extensions of approximately 10 μm. The technique therefore can serve as a sensitive warning to material failure. There are three distinct stages during which acoustic emission is generated. These stages are: crack initiation, slow crack propagation and rapid crack propagation. The distinction between the stages is based primarily on the rate of acoustic emission event accumulation. These three stages of acoustic emission correspond to the three stages of the failure process that occurs during fatigue loading. That is, changes in acoustic emission event rate correspond to changes in crack extension rate. Acoustic emission event intensities are greater during crack initiation than during slow crack propagation and greatest during rapid crack propagation. In a given fatigue cycle, event intensities increase with increasing stress and most high-intensity events occur near or at the maximum stress. Acoustic emission may therefore be used with confidence to detect, monitor and anticipate failure, in real-time.

Keywords

Fatigue Acoustic Emission Crack Initiation Crack Extension Fatigue Crack Initiation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1992

Authors and Affiliations

  • D. H. Kohn
    • 1
  • P. Ducheyne
    • 1
  • J. Awerbuch
    • 2
  1. 1.Department of BioengineeringUniversity of PennsylvaniaPhiladelphiaUSA
  2. 2.Department of Mechanical Engineering and MechanicsDrexel UniversityPhiladelphiaUSA

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