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Micromachines 2017, 8(7), 206;

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

Department of Industrial Education, National Taiwan Normal University, 162, Sec.1, Heping E. Rd., Taipei 106, Taiwan
Passive BU Department, Cyntec Company, 2, Yanfa 2nd Rd., Hsinchu 300, Taiwan
Author to whom correspondence should be addressed.
Received: 30 May 2017 / Revised: 17 June 2017 / Accepted: 21 June 2017 / Published: 27 June 2017
(This article belongs to the Special Issue Selected Papers from IEEE ICASI 2017)
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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. View Full-Text
Keywords: flexural property; fracture; nanoporous; alumina film; plastic deformation flexural property; fracture; nanoporous; alumina film; plastic deformation

Figure 1a

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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Chen, J.-H.; Luo, W.-S. Flexural Properties and Fracture Behavior of Nanoporous Alumina film by Three-Point Bending Test. Micromachines 2017, 8, 206.

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