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Flexural Properties and Fracture Behavior of Nanoporous Alumina film by Three-Point Bending Test

This study investigated the influence of porosity on the flexural property of a nanoporous alumina film. When the porosity of the alumina film increased, both bending strength and modulus declined. The results from the bending test revealed that the setting of the film during the bending test had si...

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Autores principales: Chen, Jung-Hsuan, Luo, Wen-Shiang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6190219/
https://www.ncbi.nlm.nih.gov/pubmed/30400397
http://dx.doi.org/10.3390/mi8070206
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author Chen, Jung-Hsuan
Luo, Wen-Shiang
author_facet Chen, Jung-Hsuan
Luo, Wen-Shiang
author_sort Chen, Jung-Hsuan
collection PubMed
description This study investigated the influence of porosity on the flexural property of a nanoporous alumina film. When the porosity of the alumina film increased, both bending strength and modulus declined. The results from the bending test revealed that the setting of the film during the bending test had significant influence on the flexural property. Fracture only occurred when the porous side of the alumina film suffered tensile stress. The ability to resist fracture in the barrier layer was higher than in the porous side; the magnitude of the bending strength was amplified when the barrier layer sustained tensile stress. When the porous layer suffered a tensile stress, the bending strength decreased from 182.4 MPa to 47.7 Mpa as the porosity increased from 22.7% to 51.7%; meanwhile, the modulus reduced from 82.7 GPa to 17.9 GPa. In this study, the most important finding from fractographic analysis suggested that there were a localized plastic deformations and layered ruptures at the porous side of the alumina film when a load was applied. The fracture behavior of the nanoporous alumina film observed in the present work was notably different from general ceramic materials and might be related to its asymmetric nanostructure.
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spelling pubmed-61902192018-11-01 Flexural Properties and Fracture Behavior of Nanoporous Alumina film by Three-Point Bending Test Chen, Jung-Hsuan Luo, Wen-Shiang Micromachines (Basel) Article This study investigated the influence of porosity on the flexural property of a nanoporous alumina film. When the porosity of the alumina film increased, both bending strength and modulus declined. The results from the bending test revealed that the setting of the film during the bending test had significant influence on the flexural property. Fracture only occurred when the porous side of the alumina film suffered tensile stress. The ability to resist fracture in the barrier layer was higher than in the porous side; the magnitude of the bending strength was amplified when the barrier layer sustained tensile stress. When the porous layer suffered a tensile stress, the bending strength decreased from 182.4 MPa to 47.7 Mpa as the porosity increased from 22.7% to 51.7%; meanwhile, the modulus reduced from 82.7 GPa to 17.9 GPa. In this study, the most important finding from fractographic analysis suggested that there were a localized plastic deformations and layered ruptures at the porous side of the alumina film when a load was applied. The fracture behavior of the nanoporous alumina film observed in the present work was notably different from general ceramic materials and might be related to its asymmetric nanostructure. MDPI 2017-06-27 /pmc/articles/PMC6190219/ /pubmed/30400397 http://dx.doi.org/10.3390/mi8070206 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
Chen, Jung-Hsuan
Luo, Wen-Shiang
Flexural Properties and Fracture Behavior of Nanoporous Alumina film by Three-Point Bending Test
title Flexural Properties and Fracture Behavior of Nanoporous Alumina film by Three-Point Bending Test
title_full Flexural Properties and Fracture Behavior of Nanoporous Alumina film by Three-Point Bending Test
title_fullStr Flexural Properties and Fracture Behavior of Nanoporous Alumina film by Three-Point Bending Test
title_full_unstemmed Flexural Properties and Fracture Behavior of Nanoporous Alumina film by Three-Point Bending Test
title_short Flexural Properties and Fracture Behavior of Nanoporous Alumina film by Three-Point Bending Test
title_sort flexural properties and fracture behavior of nanoporous alumina film by three-point bending test
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6190219/
https://www.ncbi.nlm.nih.gov/pubmed/30400397
http://dx.doi.org/10.3390/mi8070206
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