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Investigation into Crack-Tip Constraint of Curved Wide-Plate using Q-Stress

Q-응력을 이용한 휜 광폭평판 균열부 구속상태 변화 평가

  • Lee, Hwee-Sueng (Dept. of Mechanical System Design Engineering, Seoul Nat’l Univ. of Science and Technology) ;
  • Huh, Nam-Su (Dept. of Mechanical System Design Engineering, Seoul Nat’l Univ. of Science and Technology) ;
  • Kim, Ki-Seok (Energy Infrastructure Research Group, POSCO) ;
  • Shim, Sang-Hoon (Energy Infrastructure Research Group, POSCO) ;
  • Cho, Woo-Yeon (Energy Infrastructure Research Group, POSCO)
  • 이휘승 (서울과학기술대학교 기계시스템디자인공학과) ;
  • 허남수 (서울과학기술대학교 기계시스템디자인공학과) ;
  • 김기석 (POSCO 에너지인프라연구그룹) ;
  • 심상훈 (POSCO 에너지인프라연구그룹) ;
  • 조우연 (POSCO 에너지인프라연구그룹)
  • Received : 2014.04.07
  • Accepted : 2014.07.10
  • Published : 2014.12.01

Abstract

In the present paper, the effects of the thickness and width of a curved wide-plate, the crack length, and the strain hardening exponent on the crack-tip constraint of the curved wide-plate were investigated. To accomplish this, detailed three-dimensional elastic-plastic finite element (FE) analyses were performed considering various geometric and material variables. The material was characterized by the Ramberg-Osgood relationship, and the Q-stress was employed as a crack-tip constraint parameter. Based on the present FE results, the variations in the Q-stress of the curved wide-plate with the geometric variables and material properties were evaluated. This revealed that the effect of out-of-plane constraint conditions on the crack-tip constraint was closely related to the in-plane constraint conditions, and out-of-plane constraint conditions affected the crack-tip constraint more than in-plane constraint conditions.

Keywords

Crack-tip Constraint;Curved Wide-Plate;Finite Element Analysis;HRR Singularity;Q-Stress

Acknowledgement

Supported by : 국토교통과학기술진흥원

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