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Orthotropic ductile fracture criterion based on linear transformation

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conference contribution
posted on 2024-06-06, 03:04 authored by Jeong YoonJeong Yoon, Shunying ZhangShunying Zhang, TB Stoughton
Accurate modelling of orthotropic ductile fracture is key to carry out reliable numerical prediction of rupture in plastic deformation of lightweight metals, such as ultra high strength steel, aluminum alloys, titanium alloys and magnesium alloys. Experiments are conducted for an aluminum alloy in shear, uniaxial tension, plane strain tension along the rolling direction, the diagonal direction and the transverse direction. Loading processes are recorded and fracture strain is measured by analysis of deformation with digital image correlation. First, isotropic fracture behavior is modeled by both linear model (Maximum Shear Stress (MSS) plus mean stress) and nonlinear model (Hosford yield function plus mean stress) considering different triaxiality conditions. It is observed that the mean stress model shows significant difference in the compression area compared to Mohr Coulomb-based normal stress model and a new isotropic model with the mean stress term shows a good correlation for AA 6k21. This approach is extended to an anisotropic ductile fracture criterion based on linear transformation. The anisotropic ductile fracture criterion is applied to model orthotropic fracture strain in shear, uniaxial tension and plane strain tension. The predicted anisotropy in ductile fracture is compared with experimental results for the verification of its accuracy. The comparison indicates that the proposed anisotropic ductile fracture criterion accurately models orthotropic ductile fracture in various loading conditions in shear, uniaxial tension and plane strain tension.

History

Volume

896

Pagination

1-8

Location

Munich, Germany

Open access

  • Yes

Start date

2017-07-02

End date

2017-07-06

ISSN

1742-6588

eISSN

1742-6596

Language

eng

Publication classification

E1 Full written paper - refereed

Copyright notice

2017, the author(s)

Editor/Contributor(s)

[Unknown]

Title of proceedings

IDDRG 2017 : Materials modelling and testing for sheet metal forming : Proceedings of the 36th IDDRG Conference 2017

Event

International Deep-Drawing Research Group. Conference (36th : 2017 : Munich, Germany)

Publisher

IOP Publishing

Place of publication

Bristol, Eng.

Series

International Deep-Drawing Research Group Conference