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피로균열성장에 의해 파단된 CT시험편의 표면조도와 모멘트의 관계에 관한 연구
김경석,정현철,김경수,박찬주,장호섭,Kim, Kyun-Suk,Jung, Hyun-Chul,Kim, Kyung-Su,Park, Chan-Joo,Jang, Hos-Seob 한국생산제조학회 2010 한국생산제조학회지 Vol.25 No.6
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.