Journal of the Korean Society of Manufacturing Technology Engineers (한국생산제조학회지)

The Korean Society of Manufacturing Technology Engineers (한국생산제조학회)
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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

피로균열성장에 의해 파단된 CT시험편의 표면조도와 모멘트의 관계에 관한 연구

  • 김경석 (조선대학교 기계설계공학과) ;
  • 정현철 (조선대학교 기계설계공학과) ;
  • 김경수 (조선대학교 첨단부품소재공학과 대학원) ;
  • 박찬주 (조선대학교 기계설계공학과 대학원) ;
  • 장호섭 (조선대학교 산학협력단 레이저응용 신기술개발 연구센터)
  • Received : 2010.02.23
  • Accepted : 2010.04.09
  • Published : 2010.08.15
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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.

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References

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