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http://dx.doi.org/10.3744/SNAK.2019.56.1.082

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

Park, Sung-Ju (Department of Naval Architecture and Ocean Engineering, Inha University)
Lee, Kangsu (Korea Research Institute of Ships and Ocean Engineering)
Cerik, Burak Can (Department of Naval Architecture and Ocean Engineering, Inha University)
Kim, Younghyn (Department of Naval Architecture, Ocean & IT Engineering., Kyungnam University)
Choung, Joonmo (Department of Naval Architecture and Ocean Engineering, Inha University)
Publication Information
Journal of the Society of Naval Architects of Korea / v.56, no.1, 2019 , pp. 82-93 More about this Journal
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.
Keywords
Ductile fracture; Swift-Voce constitutive equation; Hosford-Coulomb fracture strain model; DSSE fracture strain model; Stress triaxiality; Lode angle parameter; Accumulated damage;
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Times Cited By KSCI : 4  (Citation Analysis)
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