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New Engineering Methods for Non-Linear Deflection Estimation of Cylinder under Bending

굽힘 모멘트가 작용하는 실린더의 비선형 처짐량 예측을 위한 새로운 공학적 계산식

  • 허남수 (성균관대학교 기계공학부) ;
  • 김윤재 (고려대학교 기계공학과) ;
  • 김영진 (성균관대학교 기계공학부) ;
  • 정현규 (한국원자력연구소 원자력로봇랩) ;
  • 이동훈 (한국원자력연구소 원자력로봇랩)
  • Published : 2004.03.01

Abstract

This paper proposes engineering estimation equations for the maximum deflection of a cylinder subject to bending under elastic-plastic and elastic-creep conditions. Being based on the reference stress approach, the proposed equations are simple to use and can accommodate general tensile and creep behaviours. Validation against detailed 3-D FE results using actual stress-strain data and realistic creep-deformation data shows excellent agreement, which provides confidence in the use of the proposed equation. Based on the proposed equations, together with information on in-service inspection data, discussion is given how to estimate future time-dependent and time-independent deflection of the CANDU pressure tube. Thus the present result would be valuable information for integrity assessment of the CANDU pressure tube.

Keywords

Pressure Tube;Creep Deflection;Reference Stress

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