Localized Necking Model for Punching Fracture Simulation in Unstiffened and Stiffened Panels

The ductile fracture of thin-shell structures was studied here using a localized necking model. The punching experiments for unstiffened and stiffened panels were compared with numerical predictions using a combined ductile fracture and localized necking model using shell elements. The plasticity an...

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Bibliographic Details
Published in:Applied sciences 2021-05, Vol.11 (9), p.3774
Main Authors: Park, Sung-Ju, Kim, Kookhyun
Format: Article
Language:English
Subjects:
Calibration
Crack initiation
domain of shell-to-solid equivalence
Ductile fracture
Experiments
Fracture mechanics
fracture simulation
Fractures
Hosford-Coulomb model
Hot rolling
Hot-rolled steel
localized necking
Metal forming
Necking
Numerical prediction
Plane strain
Plastic properties
Plasticity
punch tests
Shear stress
Shells (structural forms)
Simulation
Stress state
Tension
Tension tests
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Summary:The ductile fracture of thin-shell structures was studied here using a localized necking model. The punching experiments for unstiffened and stiffened panels were compared with numerical predictions using a combined ductile fracture and localized necking model using shell elements. The plasticity and fracture model parameters of JIS G3131 SPHC steel were identified by performing calibration experiments on standard flat bars, notched tension, central hole tension, plane strain tension, and shear specimens. The plasticity beyond the onset of necking was modeled using the Swift hardening law. The damage indicator framework with a combined Hosford–Coulomb fracture model and the domain of shell-to-solid equivalence (DSSE) were adopted to characterize the fracture initiation. The model parameters were calibrated based on the loading paths to fracture initiation, which were extracted from a non-linear finite element (FE) analysis. The presented HC–DSSE model was validated using punch tests and was able to predict fracture initiation with good accuracy.
ISSN:2076-3417
2076-3417
DOI:10.3390/app11093774