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Materials 2017, 10(4), 398; doi:10.3390/ma10040398

Interacting Effects Induced by Two Neighboring Pits Considering Relative Position Parameters and Pit Depth

School of Aerospace Engineering, Xiamen University, Xiamen 361005, Fujian, China
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Academic Editor: Alex A. Volinsky
Received: 30 January 2017 / Revised: 26 March 2017 / Accepted: 7 April 2017 / Published: 9 April 2017
(This article belongs to the Special Issue Stress Corrosion Cracking in Materials)
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Abstract

For pre-corroded aluminum alloy 7075-T6, the interacting effects of two neighboring pits on the stress concentration are comprehensively analyzed by considering various relative position parameters (inclination angle θ and dimensionless spacing parameter λ) and pit depth (d) with the finite element method. According to the severity of the stress concentration, the critical corrosion regions, bearing high susceptibility to fatigue damage, are determined for intersecting and adjacent pits, respectively. A straightforward approach is accordingly proposed to conservatively estimate the combined stress concentration factor induced by two neighboring pits, and a concrete application example is presented. It is found that for intersecting pits, the normalized stress concentration factor Ktnor increases with the increase of θ and λ and always reaches its maximum at θ = 90°, yet for adjacent pits, Ktnor decreases with the increase of λ and the maximum value appears at a slight asymmetric location. The simulations reveal that Ktnor follows a linear and an exponential relationship with the dimensionless depth parameter Rd for intersecting and adjacent cases, respectively. View Full-Text
Keywords: pitting corrosion; stress concentration factor; finite element analysis; relative position parameters; pit depth pitting corrosion; stress concentration factor; finite element analysis; relative position parameters; pit depth
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Huang, Y.; Gang, T.; Chen, L. Interacting Effects Induced by Two Neighboring Pits Considering Relative Position Parameters and Pit Depth. Materials 2017, 10, 398.

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