On 50 years of fatigue crack closure dispute

Daniel Kujawski; Asuri K. Vasudevan; Richard Edmond Ricker; K. Sadananda

doi:10.1111/ffe.14034

journal article May 08, 2023

On 50 years of fatigue crack closure dispute

Daniel Kujawski

Asuri K. Vasudevan Richard Edmond Ricker K. Sadananda

Fatigue & Fracture of Engineering Materials & Structures Vol. 46 No. 8 pp. 2816-2829 · Wiley

View at Publisher Save 10.1111/ffe.14034

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

Details

Published: May 08, 2023
Vol/Issue: 46(8)
Pages: 2816-2829
License: View

Authors

D

Daniel Kujawski

Mechanical and Aerospace Engineering Western Michigan University Kalamazoo Michigan USA

A

Asuri K. Vasudevan

Technical Data Analysis, Inc Falls Church Virginia USA

R

Richard Edmond Ricker

Department of Chemistry and Biochemistry University of Maryland College Park Maryland USA

K

K. Sadananda

Technical Data Analysis, Inc Falls Church Virginia USA

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

On 50 years of fatigue crack closure dispute

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