선박 및 해양구조물의 셸 요소 기반 연성 파단 예측 제2편:솔리드 및 셸 요소 기반 파단 예측

Abstract

The theoretical background of the fracture model and the Domain of Shell-to-Solid Equivalence (DSSE) were reported in PartⅠ, and fracture model with DSSE and validation is reported in PartⅡ. The ductile fracture model was combined with the damage indicator framework, which adapts a linear damage accumulation law to deal with non-proportional loading paths. An isotropic plasticity model with combined Voce Swift hardening is used to obtain equivalent plastic strains beyond the onset of diffuse necking using a trial-and-error method. The numerical analysis was carried out on different specimen geometries (notched round and flat bar, pure shear specimen, and shear tension specimens) the Hosford-Coulmb fracture model parameters were calibrated using the loading paths extracted from finite element analysis results. Validation of the presented fracture model was conducted by simulating the test and in FEA with a user defined material subroutine. Fracture model with DSSE shows better results than fracture model using shell element.