An Evaluation of Plastic Flow Characteristic for local structure of Weldment in Power Plant using SP test and Inverse FEA

역해석과 소형펀치 시험에 의한 발전설비 용접부의 소성유동특성 평가

  • 백승세 (전북대학교 정밀기계공학과 대학원) ;
  • 권일현 (전북대학교 기계항공시스템공학부) ;
  • 김회현 (전북대학교 정밀기계공학과 대학원) ;
  • 이동환 (전북대학교 기계항공시스템공학부) ;
  • 양성모 (전북대학교 기계항공시스템공학부) ;
  • 유호선 (전북대학교 기계항공시스템공학부)
  • Published : 2004.11.03

Abstract

SP test has been confirmed the availability, however the application of SP test is hampered because the relation of stress-strain and load-displacement is not determined definitely. This study suggested an evaluation technique of plastic flow characteristic for X20CrMoV121 steel weldment through inverse analysis using SP test and finite element analysis(FEA). From the result, good agreement was found in load-displacement curves obtained from SP test and FEA. Also, The behavior of load-displacement curve from FEA show a rule that load is increase with increasing K(strength coefficient) and displacement is increase with increasing n(work hardening index). From the inverse analysis, true stress-strain curve could be obtained for each local structure of weldment. And the CGHAZ and WM, which showed lower load- displacement behavior, have smaller work hardening index, while FGHAZ have the largest index.

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