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HC-DSSE 조합 파단 변형률 정식화에 기반한 선박해양 구조물용 강재의 연성 파단 예측

Ductile Fracture of a Marine Structural Steel based on HC-DSSE Combined Fracture Strain Formulation

김영훈|이강수|정준모|서재훈|박성주
대한조선학회 (The Society Of Naval Architects Of Korea)|2019.02|대한조선학회 논문집 (Journal of the Society of Naval Architects of Korea)|제56권 제1호|pp. 82-93|DOI 10.3744/SNAK.2019.56.1.082

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키워드

Ductile fracture (연성 파단)DSSE fracture strain model (DSSE 파단 변형률 모델)Stress triaxiality (응력 삼축비)Lode angle parameter (로드각 파라미터)Accumulated damage (누적 손상)
주제분류조선공학

초록

In this paper, the ductile fracture criteria for a marine structural steel (EH36) are presented and validated. The theoretical background of the recently developed Hosford-Coulomb (HC) fracture strain model and the DSSE fracture strain model which was developed to apply to the shell elements is described. In order to accurately estimate the flow stress in the large strain range up to the fracture, the material constants for the combined Swift-Voce constitutive equation were derived by the numerical analyses of the smooth and notched specimens made from the EH36 steel. As a result of applying the Swift-Voce flow stress to the other notched specimen model, a very accurate load - displacement curve could be derived. The material constants of the HC fracture strain and DSSE fracture strain models were independently calibrated based on the numerical analyses for the smooth and notch specimen tests. The user subroutine (VUMAT of Abaqus) was developed to verify the accuracy of the combined HC-DSSE fracture strain model. An asymmetric notch specimen was used as verification model. It was confirmed that the fracture of the asymmetric specimen can be accurately predicted when a very small solid elements are used together with the HC fracture strain model. On the other hand, the combined HC-DSSE fracture strain model can predict accurately the fracture of shell element model while the shell element size effect becomes less sensitive.

Abstract

In this paper, the ductile fracture criteria for a marine structural steel (EH36) are presented and validated. The theoretical background of the recently developed Hosford-Coulomb (HC) fracture strain model and the DSSE fracture strain model which was developed to apply to the shell elements is described. In order to accurately estimate the flow stress in the large strain range up to the fracture, the material constants for the combined Swift-Voce constitutive equation were derived by the numerical analyses of the smooth and notched specimens made from the EH36 steel. As a result of applying the Swift-Voce flow stress to the other notched specimen model, a very accurate load - displacement curve could be derived. The material constants of the HC fracture strain and DSSE fracture strain models were independently calibrated based on the numerical analyses for the smooth and notch specimen tests. The user subroutine (VUMAT of Abaqus) was developed to verify the accuracy of the combined HC-DSSE fracture strain model. An asymmetric notch specimen was used as verification model. It was confirmed that the fracture of the asymmetric specimen can be accurately predicted when a very small solid elements are used together with the HC fracture strain model. On the other hand, the combined HC-DSSE fracture strain model can predict accurately the fracture of shell element model while the shell element size effect becomes less sensitive.

참고문헌 (38)

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선형 및 비선형 손상 발전 모델을 이용한 고장력강(EH36)의 연성 파단 예측박병재, 박성주, 정준모한국해양공학회 · 한국해양공학회지2017 · 제31권 제4호Comparative Study on Various Ductile Fracture Models for Marine Structural Steel EH36박성주, 서재훈, 이강수, 정준모한국해양공학회 · 한국해양공학회지2019 · 제33권 제3호저온용 고장력강(EH36)의 평균 응력 삼축비에 따른 파단 변형률 정식화남웅식, 정준모한국해양공학회 · 한국해양공학회지2013 · 제27권 제2호조선 해양 구조물용 강재의 소성 및 파단 특성 II: 파단의 이론적 배경김경수, 심천식, 정준모한국해양공학회 · 한국해양공학회지2011 · 제25권 제2호조선 해양 구조물용 강재의 소성 및 파단 특성 III: 파단 변형률에 관한 실험적 연구김경수, 심천식, 정준모한국해양공학회 · 한국해양공학회지2011 · 제25권 제3호상용 유한요소코드 사용자-서브루틴을 이용한 저온용 고장력강 (EH36)의 파단 시뮬레이션김영훈, 남웅식, 정준모한국해양공학회 · 한국해양공학회지2014 · 제28권 제1호

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