Proceedings of the KWS Conference (대한용접접합학회:학술대회논문집)

The Korean Welding and Joining Society (대한용접접합학회)
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Criterion for ductile crack initiation with strength mismatch under dynamic loading

강도적 불균질을 갖는 구조물의 동적하중하에서의 연성크랙 발생조건

  • 안규백 (일본 오사카대학 대학원) ;
  • 일본명 (일본 오사카대학 대학원 생산과학전공) ;
  • 일본명 (일본 오사카대학 대학원 생산과학전공) ;
  • 방한서 (조선대학교 선박해양공학과) ;
  • 일본명 (일본 오사카대학 대학원 생산과학전공)
  • Published : 2003.11.01
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Abstract

The present study focuses on the effect of geometrical discontinuity, strength mismatch, which can elevate plastic constraint due to heterogeneous plastic straining, and loading rate on the ductile crack initiation using two-parameter criterion. Fracture initiation testing has been conducted under static and dynamic loading using circumferentially notched round-bar specimens. In order to evaluate the stress/strain state in the specimens, especially under dynamic loading, a thermal elastic-plastic dynamic finite element (FE) analysis considering the temperature rise due to plastic deformation has been carried out.

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