Metallurgical Transactions A

, Volume 16, Issue 8, pp 1467–1477 | Cite as

On the development of crack closure and the threshold condition for short and long fatigue cracks in 7150 aluminum alloy

  • E. Zaiken
  • R. O. Ritchie
Mechanical Behavior
Received:

Abstract

In an attempt to analyze the behavior of physically “short” cracks, a study has been made of the development, location, and effect of crack closure on the behavior of fatigue cracks arrested at the “long” crack threshold stress intensity range, ΔK TH , in underaged, peak aged, and overaged microstructures in a 7150 aluminum alloy. By monitoring the change in closure stress intensity,K cl, during thein situ removal of material left in the wake of arrested threshold cracks, approximately 50 pct of the closure was found to be confined to a region within ∼500 μm of the crack tip. Following wake removal, previously arrested threshold cracks recommenced to propagate at low load ratios even though nominal stress intensity ranges didnot exceed ΔK TH , representing the behavior of physically short cracks emanating from notches. No such crack extension at ΔK TH was seen at high load ratios. With subsequent crack extension, crack closure was observed to redevelop leading to a deceleration in growth rates. The development of such closure was found to occur over crack extensions comparable with microstructural dimensions, rather than those associated with local crack tip plasticity. Such results provide further confirmation that the existence of a fatigue threshold and the growth of physically short cracks are controlled primarily by crack closure, and the data are discussed in terms of the micro-mechanisms of closure in precipitation hardened alloy systems.

Keywords

Metallurgical Transaction Fatigue Crack Crack Extension Crack Closure Short Crack 
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Copyright information

© The Metallurgical Society of American Institute of Mining 1985

Authors and Affiliations

  • E. Zaiken
    • 1
  • R. O. Ritchie
    • 2
  1. 1.Shiley IncorporatedIrvine
  2. 2.Department of Materials Science and Mineral EngineeringUniversity of CaliforniaBerkeley

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