한국해양공학회지 (Journal of Ocean Engineering and Technology)

  • 제29권3호
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  • Pages.241-248
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  • 2015
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  • 1225-0767(pISSN)
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  • 2287-6715(eISSN)
한국해양공학회 (Korean Society of Ocean Engineers)
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심해저용 전기 저항 용접 소구경 송유관 소재의 온도 및 변형률 속도 에 따른 유동 응력 특성

Flow Stress Properties of Electric Resistance Welded Small-Sized Subsea Pipeline Subjected to Temperature and Strain Rate Variations

  • 김영훈 (경남대학교 조선해양IT공학과) ;
  • 박성주 (인하대학교 조선해양공학과) ;
  • 윤성원 (인하대학교 조선해양공학과) ;
  • 정준모 (인하대학교 조선해양공학과)
  • Kim, Younghun (Department of Naval Architecture, Ocean & IT Engineering., Kyungnam University) ;
  • Park, Sung-Ju (Department of Naval Architecture and Ocean Engineering, Inha University) ;
  • Yoon, Sung-Won (Department of Naval Architecture and Ocean Engineering, Inha University) ;
  • Choung, Joonmo (Department of Naval Architecture and Ocean Engineering, Inha University)
  • 투고 : 2015.03.23
  • 심사 : 2015.06.22
  • 발행 : 2015.06.30
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초록

A subsea pipeline for oil/gas transportation or gas injection is subjected to extreme variations in internal pressure and temperature, which can involve a strain rate effect on the pipeline material. This paper describes the flow stress characteristics of a pipeline material called API 5L X52N PSL2, using and experimental approach. High-speed tensile tests were carried out for two metal samples taken from the base and weld parts. The target temperature was 100℃, but two other temperature levels of –20℃and 0℃ were taken into account. Three strain rates were also considered for each temperature level: quasi static, 1/s, and 10/s. Flow stress data were proposed for each temperature level according to these strain rates. The dynamic hardening behaviors of the base and weld metals appeared to be nonlinear on the log-scale strain rate axis. A very high material constant value was required for the Cowper-Symonds constitutive equation to support the experimental results.

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참고문헌

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