期刊
APPLIED SCIENCES-BASEL
卷 11, 期 9, 页码 -出版社
MDPI
DOI: 10.3390/app11093774
关键词
ductile fracture; localized necking; punch tests; fracture simulation; domain of shell-to-solid equivalence; Hosford-Coulomb model; shell element
类别
资金
- Tongmyong University Innovated University Research Park (I-URP) - Busan Metropolitan City, Republic of Korea
The ductile fracture of thin-shell structures was studied using a localized necking model in combination with the Swift hardening law for plasticity modeling. The proposed HC-DSSE model, incorporating a combined Hosford-Coulomb fracture model and DSSE, accurately predicted fracture initiation in punch tests.
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.
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