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http://dx.doi.org/10.4191/kcers.2014.51.5.399

Mechanical Behavior of Glass/Porous Alumina by Contact Loading  

Kim, Chul (School of Mechanical Systems Engineering, Kookmin University)
Kim, Sang Kyum (School of Mechanical Systems Engineering, Kookmin University)
Kim, Tae Woo (School of Mechanical Systems Engineering, Kookmin University)
Lee, Kee Sung (School of Mechanical Systems Engineering, Kookmin University)
Publication Information
Journal of the Korean Ceramic Society / v.51, no.5, 2014 , pp. 399-405 More about this Journal
Abstract
Porous alumina with different porosities, 5.2 - 47.5%, were coated with cover-glass having a thickness of $160{\mu}m$, using epoxy adhesive. We investigated the effect of the porosity of the substrate layer on the crack initiation load, and the size of cracks propagated in the coating layer. Hertzian indentations were used to evaluate the damage behavior under a constrained loading condition. Typically, two types of cracks, ring cracks and radial cracks, were observed on the surface of the glass/porous alumina structure. Indentation stress-strain curves, crack initiation loads, crack propagation sizes, and flexural strengths were investigated as a function of porosities. The results indicated that a porosity of less than 30% and a higher substrate elastic modulus were beneficial at suppressing cracks occurrence and propagation. We expect lightweight mechanical components with high strength can be successfully fabricated by coating and controlling porosities in the substrate layer.
Keywords
Porous alumina; Contact loading; Hertzian indentation; Mechanical behavior;
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