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Fatigue Strength Estimation Based on Local Mechanical Properties for Aluminum Alloy FSW Joints

Overall fatigue strengths and hardness distributions of the aluminum alloy similar and dissimilar friction stir welding (FSW) joints were determined. The local fatigue strengths as well as local tensile strengths were also obtained by using small round bar specimens extracted from specific locations...

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Autores principales: Sillapasa, Kittima, Mutoh, Yoshiharu, Miyashita, Yukio, Seo, Nobushiro
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5459202/
https://www.ncbi.nlm.nih.gov/pubmed/28772543
http://dx.doi.org/10.3390/ma10020186
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author Sillapasa, Kittima
Mutoh, Yoshiharu
Miyashita, Yukio
Seo, Nobushiro
author_facet Sillapasa, Kittima
Mutoh, Yoshiharu
Miyashita, Yukio
Seo, Nobushiro
author_sort Sillapasa, Kittima
collection PubMed
description Overall fatigue strengths and hardness distributions of the aluminum alloy similar and dissimilar friction stir welding (FSW) joints were determined. The local fatigue strengths as well as local tensile strengths were also obtained by using small round bar specimens extracted from specific locations, such as the stir zone, heat affected zone, and base metal. It was found from the results that fatigue fracture of the FSW joint plate specimen occurred at the location of the lowest local fatigue strength as well as the lowest hardness, regardless of microstructural evolution. To estimate the fatigue strengths of aluminum alloy FSW joints from the hardness measurements, the relationship between fatigue strength and hardness for aluminum alloys was investigated based on the present experimental results and the available wide range of data from the references. It was found as: σ(a) (R = −1) = 1.68 HV (σ(a) is in MPa and HV has no unit). It was also confirmed that the estimated fatigue strengths were in good agreement with the experimental results for aluminum alloy FSW joints.
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spelling pubmed-54592022017-07-28 Fatigue Strength Estimation Based on Local Mechanical Properties for Aluminum Alloy FSW Joints Sillapasa, Kittima Mutoh, Yoshiharu Miyashita, Yukio Seo, Nobushiro Materials (Basel) Article Overall fatigue strengths and hardness distributions of the aluminum alloy similar and dissimilar friction stir welding (FSW) joints were determined. The local fatigue strengths as well as local tensile strengths were also obtained by using small round bar specimens extracted from specific locations, such as the stir zone, heat affected zone, and base metal. It was found from the results that fatigue fracture of the FSW joint plate specimen occurred at the location of the lowest local fatigue strength as well as the lowest hardness, regardless of microstructural evolution. To estimate the fatigue strengths of aluminum alloy FSW joints from the hardness measurements, the relationship between fatigue strength and hardness for aluminum alloys was investigated based on the present experimental results and the available wide range of data from the references. It was found as: σ(a) (R = −1) = 1.68 HV (σ(a) is in MPa and HV has no unit). It was also confirmed that the estimated fatigue strengths were in good agreement with the experimental results for aluminum alloy FSW joints. MDPI 2017-02-15 /pmc/articles/PMC5459202/ /pubmed/28772543 http://dx.doi.org/10.3390/ma10020186 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
Sillapasa, Kittima
Mutoh, Yoshiharu
Miyashita, Yukio
Seo, Nobushiro
Fatigue Strength Estimation Based on Local Mechanical Properties for Aluminum Alloy FSW Joints
title Fatigue Strength Estimation Based on Local Mechanical Properties for Aluminum Alloy FSW Joints
title_full Fatigue Strength Estimation Based on Local Mechanical Properties for Aluminum Alloy FSW Joints
title_fullStr Fatigue Strength Estimation Based on Local Mechanical Properties for Aluminum Alloy FSW Joints
title_full_unstemmed Fatigue Strength Estimation Based on Local Mechanical Properties for Aluminum Alloy FSW Joints
title_short Fatigue Strength Estimation Based on Local Mechanical Properties for Aluminum Alloy FSW Joints
title_sort fatigue strength estimation based on local mechanical properties for aluminum alloy fsw joints
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5459202/
https://www.ncbi.nlm.nih.gov/pubmed/28772543
http://dx.doi.org/10.3390/ma10020186
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