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Plasticity and Fracture Behaviors of Marine Structural Steel, Part III: Experimental Study on Failure Strain
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 Title & Authors
Plasticity and Fracture Behaviors of Marine Structural Steel, Part III: Experimental Study on Failure Strain
Choung, Joon-Mo; Shim, Chun-Sik; Kim, Kyung-Su;
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 Abstract
This is the third of several companion papers dealing with the derivation of material constants for ductile failure criteria under hydrostatic stress. It was observed that the ultimate engineering stresses and elongations at fracture from tensile tests for round specimens with various notch radii tended to increase and decrease, respectively, because of the stress triaxiality. The engineering stress curves from tests are compared with numerical simulation results, and it is proved that the curves from the two approaches very closely coincide. Failure strains are obtained from the equivalent plastic strain histories from numerical simulations at the time when the experimental engineering stress drops suddenly. After introducing the new concept of average stress triaxiality and accumulated average strain energy, the material constants of the Johnson-Cook failure criterion for critical energies of 100%, 50%, and 15% are presented. The experimental results obtained for EH-36 steel were in relatively good agreement with the 100% critical energy, whereas the literature states that aluminum fits with a 15% critical energy. Therefore, it is expected that a unified failure criterion for critical energy, which is available for most kinds of ductile materials, can be provided according to the used materials.
 Keywords
Failure strain;Stress triaxiality;Average stress triaxiality;Equivalent plastic strain;Ductile fracture;Shear fracture;
 Language
Korean
 Cited by
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조선 해양 구조물용 강재의 소성 및 파단 특성 V: 온도 의존성을 고려한 변형률 속도에 관한 실험적 연구,정준모;임성우;김경수;

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조선 해양 구조물용 강재의 소성 및 파단 특성 IV: 고온 기계적 물성치에 관한 실험적 연구,정준모;임성우;박노식;

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3.
저온용 고장력강(EH36)의 평균 응력 삼축비에 따른 파단 변형률 정식화,정준모;남웅식;

한국해양공학회지, 2013. vol.27. 2, pp.19-26 crossref(new window)
4.
최적형상을 갖는 휨지배형 강재스트립댐퍼의 단조성능 평가,우승기;이창환;주영규;김상대;

대한건축학회논문집:구조계, 2013. vol.29. 2, pp.3-11
5.
상용 유한요소코드 사용자-서브루틴을 이용한 저온용 고장력강 (EH36)의 파단 시뮬레이션,정준모;남웅식;김영훈;

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극한지용 고장력강의 평균 응력 삼축비 및 평균 정규 로드 파라메터를 고려한 3차원 파단 변형률 평면 개발: 제2부 파단 변형률 평면의 정식화,정준모;박성주;김영훈;

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극한지용 고장력강의 평균 응력 삼축비 및 평균 정규 로드 파라메터를 고려한 3차원 파단 변형률 평면 개발: 제1부 이론적 배경과 실험적 연구,정준모;박성주;김영훈;

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Development of Three Dimensional Fracture Strain Surface in Average Stress Triaxiaility and Average Normalized Lode Parameter Domain for Arctic High Tensile Steel: Part I Theoretical Background and Experimental Studies, Journal of Ocean Engineering and Technology, 2015, 29, 6, 445  crossref(new windwow)
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Fracture Simulation of Low-Temperature High-Strength Steel (EH36) using User-Subroutine of Commercial Finite Element Code, Journal of Ocean Engineering and Technology, 2014, 28, 1, 34  crossref(new windwow)
7.
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