연속체 손상역학을 이용한 용접구조물의 수치피로시험기법 (Numerical Fatigue Test Method of Welded Structures Based on Contimuum Damage Mechanics)

서지정보

· 발행기관 : 대한용접접합학회
· 수록지 정보 : 대한용접접합학회지 / 26권 / 3호 / 67 ~ 73페이지
· 저자명 : 이치승, 이제명, 김영환, 김태우, 유병문

초록

Fatigue life evaluation of welded structures in a range of high cycles is one of the most difficult
problems since extremely small plastic deformation and damage occur during the loading cycles. Moreover,
it is very difficult to identify the strong non-linearities of welding, inducing residual stress. In this paper,
numerical fatigue test method for welded structures was developed using continuum damage mechanics with
inherent strain. Recently, continuum damage mechanics, which can simulate both crack initiation at the
micro-scale level and crack propagation at the meso-scale level, has been adopted in the fracture related
problem. In order to consider the residual stresses in the welded strictures, damage calculation in
conjunction with welding, inducing inherent strain, was proposed. The numerical results obtained from the
damage calculation were compared to experimental results.

영어초록

Fatigue life evaluation of welded structures in a range of high cycles is one of the most difficult
problems since extremely small plastic deformation and damage occur during the loading cycles. Moreover,
it is very difficult to identify the strong non-linearities of welding, inducing residual stress. In this paper,
numerical fatigue test method for welded structures was developed using continuum damage mechanics with
inherent strain. Recently, continuum damage mechanics, which can simulate both crack initiation at the
micro-scale level and crack propagation at the meso-scale level, has been adopted in the fracture related
problem. In order to consider the residual stresses in the welded strictures, damage calculation in
conjunction with welding, inducing inherent strain, was proposed. The numerical results obtained from the
damage calculation were compared to experimental results.

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