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Materials Science

, Volume 31, Issue 1, pp 32–38 | Cite as

Behavior of short fatigue cracks initiated from a notch in 8090 Al-Li alloy

  • Z. G. Wang
  • Z. H. Shan
  • Y. Zhang
Article
  • 22 Downloads

Abstract

The rates of growth of short fatigue cracks initiated from a notch are much greater than the rates of growth of long fatigue cracks for the same values of ΔK. A decrease in the strength of materials caused by aging affects the behavior of long cracks. The geometric form of the notch strongly affects the behavior of short cracks. The growth rate of a short crack initiated from a sharp notch decreases and attains a minimum value at a length of 0.45 mm, which is far beyond the region of its influence. However, short cracks initiated from blunt notches exhibit slower growth in the region of stress concentration than outside this region. Strain fields induced by deformation of the tip of the notch are not the only factor inhibiting the propagation of short cracks from notches. To explain the behavior of a short crack initiated at a notch, one must take into account some other factors, in particular, crack closure.

Keywords

Growth Rate Fatigue Fatigue Crack Slow Growth Stress Concentration 
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Copyright information

© Plenum Publishing Corporation 1996

Authors and Affiliations

  • Z. G. Wang
    • 1
  • Z. H. Shan
    • 1
  • Y. Zhang
    • 1
  1. 1.State Key Laboratory for Fatigue and Fracture of MaterialsInstitute of Metal Research, Academia SinicaShenyangPeople's Republic of China

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