Abstract
Based on the forming limit experiments of copper sheet metals with different grain sizes, it is found that there is a significant reduction of forming limit with the increase of grain size under different deformation paths. To describe the size effect induced decrease of forming limit, a number of the most widely-used failure criteria and theories were employed to investigate their applicability in meso-scale plastic deformation, including the Swift/Hill criteria, Marciniak-Kuczynski model, ductile fracture criteria such as Freudenthal, Cockcroft & Latham, Ayada and Oyane models, and the Gurson-Tvergaard-Needleman model coupled with the Thomason void coalescence model (GTN-Thomason model). The applicability of these criteria and the mechanism behind them were discussed for better characterization of the failure behavior at micro/mesoscale. In addition, to corroborate the developed method, meso-scale hydroforming experiments of sheet metals was conducted. The M-K model and the GTN-Thomason model are revealed to be able to accurately predict the ultimate pressure and the height at the onset of failure by comparing to the experimental results.
Original language | English |
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Pages (from-to) | 190-203 |
Number of pages | 14 |
Journal | International Journal of Mechanical Sciences |
Volume | 120 |
DOIs | |
Publication status | Published - 1 Jan 2017 |
Keywords
- Ductile fracture criterion
- Forming limit
- Meso-scale plastic deformation
- Sheet metal
- Size effect
ASJC Scopus subject areas
- Civil and Structural Engineering
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering