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Journal of Failure Analysis and Prevention

, Volume 10, Issue 2, pp 120–137 | Cite as

Counting on Fatigue: Striations and Their Measure

  • P. H. DeVries
  • K. T. Ruth
  • D. P. Dennies
Technical Article---Peer-Reviewed

Abstract

Fatigue has been the subject of innumerable books, papers, and studies since the late 1800s and continues to be a major factor in component failure with an estimated 90% of all mechanical failures being attributed to fatigue (Dieter, Mechanical metallurgy, 1976). The classic fatigue “thumbnail” often visible to the naked eye may allege fatigue, but microscopic striations—tiny ridges that bear immutable witness to cyclical loading—pronounce the verdict. As such, counting striations should provide the analyst with valuable information regarding the loading regimen, the time to failure, and insight into events that gave birth to fracture. This paper presents both pros and cons of striation counting and discusses striation count accuracy. It also presents practical techniques for use in fatigue striation counting based on laboratory experience and observation.

Keywords

Crack growth rate Fatigue analysis Fatigue crack growth Fatigue cracking Fatigue failure Fatigue striations 

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Copyright information

© ASM International 2010

Authors and Affiliations

  1. 1.The Boeing CompanyHuntington BeachUSA
  2. 2.The Boeing CompanyHuntington BeachUSA

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