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A Study on a Relationship Between the Surface Roughness of Fracture CT Specimen Broken by Fatigue Crack Growth and the Moments  

Kim, Kyun-Suk (조선대학교 기계설계공학과)
Jung, Hyun-Chul (조선대학교 기계설계공학과)
Kim, Kyung-Su (조선대학교 첨단부품소재공학과 대학원)
Park, Chan-Joo (조선대학교 기계설계공학과 대학원)
Jang, Hos-Seob (조선대학교 산학협력단 레이저응용 신기술개발 연구센터)
Publication Information
Journal of the Korean Society of Manufacturing Technology Engineers / v.19, no.4, 2010 , pp. 462-468 More about this Journal
Abstract
Fatigue crack growth caused by surface defects is one of the most important subjects for the evaluation and the assurance of safety in pressure vessels, piping systems, LPG/LNG fuel tank and other various structures. So, this paper aims to investigate the relationship between the surface roughness of fracture CT specimens and the moments on the specimen when doing fatigue test for the evaluation and the assurance of safety of structures from fatigue crack deconstruction. In this experiment, the CT specimens were loaded by a fatigue testing machine with changing loads until they are broken. The surface roughness of the fracture CT specimens was measured using 3D precise shape measuring equipment and digital holography. As a result of this study, It was identified that the average roughnesses are similar at the positions that has a same moments by comparing the results with the moments on the specimen according to the position.
Keywords
Digital holography; Fatigue crack; Surface roughness; CT specimen;
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