한국안전학회지 (Journal of the Korean Society of Safety)

  • 제23권1호
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  • Pages.1-11
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  • 2008
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  • 1738-3803(pISSN)
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  • 2383-9953(eISSN)
한국안전학회 (The Korean Society of Safety)
권호 표지

소형펀치시험과 유한요소해석을 이용한 A53B 탄소강 파손 배관의 강도 평가

Strength Evaluation of A Failed A53B Carbon Steel Pipe with Small Punch Test and Finite Element Analysis

  • 발행 : 2008.02.29
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초록

In this study, small punch test and tensile test were performed with specimens directly machined from an ASTM A53 grade B carbon steel pipe at which an explosion accident was occurred in the Heavy Oil Unit. Main damage mechanism of the pipe was known as a high temperature hydrogen attack(HTHA). Effects of HTHA on the mechanical strength change of the A53B steel were studied in detail. Small punch test results have showed that maximum reaction forces, SP energy and ductility were decreased at hydrogen attacked part of the pipe compared with sound part of the pipe. Yield strength and tensile ultimate strength were calculated with the obtained small punch test curve results using different methods and compared the estimation methods. Small punch test simulation has been also performed with the finite element method and then mechanical strength, equivalent strain and fracture toughness were calculated with the obtained numerical analysis results. It was shown that the fracture toughness data calculated from small punch equivalent energy obtained by the finite element analysis for SP test was very low at the hydrogen attacked part.

키워드

참고문헌

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