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

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...

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Autores principales: Huang, Yongfang, Gang, Tieqiang, Chen, Lijie
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5506949/
https://www.ncbi.nlm.nih.gov/pubmed/28772758
http://dx.doi.org/10.3390/ma10040398
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author Huang, Yongfang
Gang, Tieqiang
Chen, Lijie
author_facet Huang, Yongfang
Gang, Tieqiang
Chen, Lijie
author_sort Huang, Yongfang
collection PubMed
description 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 K(tnor) increases with the increase of θ and λ and always reaches its maximum at θ = 90°, yet for adjacent pits, K(tnor) decreases with the increase of λ and the maximum value appears at a slight asymmetric location. The simulations reveal that K(tnor) follows a linear and an exponential relationship with the dimensionless depth parameter R(d) for intersecting and adjacent cases, respectively.
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spelling pubmed-55069492017-07-28 Interacting Effects Induced by Two Neighboring Pits Considering Relative Position Parameters and Pit Depth Huang, Yongfang Gang, Tieqiang Chen, Lijie Materials (Basel) Article 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 K(tnor) increases with the increase of θ and λ and always reaches its maximum at θ = 90°, yet for adjacent pits, K(tnor) decreases with the increase of λ and the maximum value appears at a slight asymmetric location. The simulations reveal that K(tnor) follows a linear and an exponential relationship with the dimensionless depth parameter R(d) for intersecting and adjacent cases, respectively. MDPI 2017-04-09 /pmc/articles/PMC5506949/ /pubmed/28772758 http://dx.doi.org/10.3390/ma10040398 Text en © 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Huang, Yongfang
Gang, Tieqiang
Chen, Lijie
Interacting Effects Induced by Two Neighboring Pits Considering Relative Position Parameters and Pit Depth
title Interacting Effects Induced by Two Neighboring Pits Considering Relative Position Parameters and Pit Depth
title_full Interacting Effects Induced by Two Neighboring Pits Considering Relative Position Parameters and Pit Depth
title_fullStr Interacting Effects Induced by Two Neighboring Pits Considering Relative Position Parameters and Pit Depth
title_full_unstemmed Interacting Effects Induced by Two Neighboring Pits Considering Relative Position Parameters and Pit Depth
title_short Interacting Effects Induced by Two Neighboring Pits Considering Relative Position Parameters and Pit Depth
title_sort interacting effects induced by two neighboring pits considering relative position parameters and pit depth
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5506949/
https://www.ncbi.nlm.nih.gov/pubmed/28772758
http://dx.doi.org/10.3390/ma10040398
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