Abstract
AbstractIn this article, we examine the 50 years of observations and interpretations into the subject of fatigue crack closure in lab air and aqueous solutions: disputes and implications. Over this period, several closure concepts have been invoked to explain why the crack propagation threshold ΔKth should reduce with load ratio R. Among these, three types are the most popular and these are closure induced by crack (i) plasticity (PICC), (ii) oxides (OICC), and (iii) roughness (RICC). Therefore, these three and their role in shielding the fatigue crack tip are critically examined. This analysis finds that the reduction in ΔKth with increasing R‐ratio in lab air and aqueous solutions is weakly linked to decreasing crack closure behind the crack tip but strongly related to the access of the environment to the crack tip region and its influence on fatigue damage at and ahead of the crack tip. Supporting evidence for this interpretation comes from the lack of ΔKth dependence on R in a good vacuum (with partial pressure of 10−5 Pa or less). In chemical environments, our viewpoint is supported by a critical analysis of corrosion processes that found that there is insufficient time for most metallic species to form ions, hydrolyze, and transform into hard phases at the crack tip before closure. Therefore, when closure occurs at the crack tip, most of the oxidized metallic species will exist as aquo‐complexes, gel, or colloids that have insufficient shear strength to wedge crack faces during unloading.
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References
70
[1]
Fatigue crack closure under cyclic tension

Elber Wolf

Engineering Fracture Mechanics 10.1016/0013-7944(70)90028-7
[3]
Suresh S (1991)
[4]
Newman JC (2000)
[8]
Sadananda K (1993)
[9]
A review of crack closure, fatigue crack threshold and related phenomena

A.K. Vasudeven, K. Sadananda, N. Louat

Materials Science and Engineering: A 10.1016/0921-5093(94)90351-4
[22]
Hertzberg RW (2022)
[23]
Vasudevan AK "Implications of ΔK‐R ratio in vacuum" Fatigue Fract Eng Mater Struct (2022)
[24]
Fatigue crack tip corrosion processes and oxide induced closure

A.K. Vasudevan, R.E. Ricker, A.C. Miller et al.

Materials Science and Engineering: A 10.1016/j.msea.2022.144383
[25]
Roughness induced crack Closure: A review of key points

Asuri K. Vasudevan, Daniel Kujawski

Theoretical and Applied Fracture Mechanics 10.1016/j.tafmec.2023.103897
[28]
Riddell WT (1999)
[37]
Holtz RL (1998)
[38]
Petit J
[40]
Petit J (1998)
[41]
Petit J (2000)
[43]
Paris PC (2005)
[44]
Engineering ToolBox (2020)
[46]
Oudar J (1995)
[48]
MottNF.A theory of the formation of protective oxide films on metals.1939;35:1175. 10.1039/tf9393501175

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Details
Published
May 08, 2023
Vol/Issue
46(8)
Pages
2816-2829
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Cite This Article
Daniel Kujawski, Asuri K. Vasudevan, Richard Edmond Ricker, et al. (2023). On 50 years of fatigue crack closure dispute. Fatigue & Fracture of Engineering Materials & Structures, 46(8), 2816-2829. https://doi.org/10.1111/ffe.14034