Journal
INTERNATIONAL JOURNAL OF MATERIAL FORMING
Volume 11, Issue 4, Pages 527-539Publisher
SPRINGER FRANCE
DOI: 10.1007/s12289-017-1362-7
Keywords
GTN damage model; Shear modification; Stress triaxiality; Sheet metal forming; Numerical simulation
Categories
Funding
- Key Project of the National Natural Science Foundation of China [11272075]
- China's Post-doctoral Science Fund [2014M561223]
- Fundamental Research Fund for the Central University [DUT16RC(4)28, DUT17JC38]
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Gurson-type models have been widely used to predict failure during sheet metal forming process. However, a significant limitation of the original GTN model is that it is unable to capture fracture under relatively low stress triaxiality. This paper focused on the fracture prediction under this circumstance, which means shear-dominated stress state. Recently, a phenomenological modification to the Gurson model that incorporates damage accumulation under shearing has been proposed by Nahshon and Hutchinson. We further calibrated new parameters based on this model in 22MnB5 tensile process and developed the corresponding numerical implementation method. Lower stress triaxiality were realized by new-designed specimens. Subsequently, the related shear parameters were calibrated by means of reverse finite element method and the influences of new introduced parameters were also discussed. Finally, this shear modified model was utilized to model the small punch test (SPT) on 22MnB5 high strength steel. It is shown that the shear modification of GTN model is able to predict failure of sheet metal forming under wide range of stress state.
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