The Proceedings of the Materials and Mechanics Conference
Online ISSN : 2424-2845
2018
Session ID : OS0725
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Tensile Characteristics of Alumite Evaluated by Using Aluminum Specimen Having Anodized Layer
*Kohei FUKUCHIKen-ichi OHGUCHITakayuki OHMORIKengo KUROSAWAYorimasa THUBOTAWataru NAGAI
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Abstract

Conventionally, anodizing treatments have been performed on aluminum alloy combustion chamber of internalcombustion engine to suppress occurrence of heat cracks. Recently, it has been found that the alumite layer formed by the treatments is effective in improving the thermal efficiency of internal-combustion engines. Therefore, some anodizing methods have been proposed to form thick alumite layers on aluminum alloy parts in internal combustion engines, and the parts made by the methods have already been put into practical use. To evaluate the strength reliability of those anodized parts, it is essential to understand the tensile characteristics of the alumite. In this study, we proposed a method based on the rule of mixtures (ROM) to evaluate the tensile properties of the alumite. Then, tensile tests were conducted using anodizing treated aluminum specimens and non-treated aluminum specimens. Before the tests, the thickness of the alumite layer in the anodizing treated aluminum specimen was measured by using X-ray CT, and it was used to estimate the area ratio of the layer in the cross-section of the specimen. By using the stress-strain relations obtained from the tensile tests with the estimated area ratios, the tensile stress-strain relations of the alumite layers were estimated and they were used to discuss the tensile characteristics of the alumite layers. These results showed that the stress-strain relation of the alumite layer had peculiar shape.

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© 2018 The Japan Society of Mechanical Engineers
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