Unusual Fatigue Crack Growth Behavior of Long Cracks at Low Stress Intensity Factor Ranges
Daniel Kujawski, Asuri K. Vasudevan
TL;DR
Some alloys show unexpected fatigue crack growth behavior at low stress levels, challenging traditional design methods.
Contribution
This paper characterizes unusual fatigue crack growth behavior in certain alloys at low stress intensity factor ranges.
Findings
Some alloys lack a fatigue crack growth threshold at low ΔK values.
Long cracks in these materials show a plateau or acceleration in crack growth rate with decreasing ΔK.
This behavior is observed experimentally but remains poorly understood.
Abstract
In this article, we characterize and review the unusual lack of threshold in fatigue crack growth (FCG) behavior for some alloys at low values of stress intensity factor ranges ΔK and its implications to damage-tolerant design approaches. This unusual behavior was first observed by Marci in 1996 in IMI 834 alloy. Conventional applications of linear elastic fracture mechanics to FCG analysis at constant R-ratio (or Kmax) assumes that (da/dN) decreases monotonically with decreasing ΔK and approaches the threshold value of ΔKth with (da/dN) ≤ 10−7 mm/cycle for a given R (or Kmax). However, instead of ΔK threshold behavior, some materials exhibit plateau or acceleration in da/dN rate with decreasing ΔK for long cracks tested in both constant R and Kmax conditions. This unusual (da/dN)-ΔK behavior is only observed experimentally but not understood and represents a challenge to scientists and…
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Taxonomy
TopicsBotany and Plant Ecology Studies · Integrated Water Resources Management