Publication: Sequence of deformation of automotive sheet alloys
All || By Area || By Year| Title | Sequence of deformation of automotive sheet alloys | Authors/Editors* | X. Duan, Y. Ososkov, M. Jain, D. Metzger and D. S. Wilkinson |
|---|---|
| Where published* | Metallurgical and Materials Transactions A |
| How published* | None |
| Year* | 2004 |
| Volume | 0 |
| Number | 0 |
| Pages | |
| Publisher | xxxxx |
| Keywords | localization, damage, ductile material, FEM, fracture |
| Link | |
| Abstract |
Deformation and fracture behaviour of formable automotive sheet materials: DQAK steel, DP600 steel, AA5754 and AA6111 alloys are experimentally assessed at room temperature through standard uniaxial tension, plane strain tension and bending tests. The above materials exhibit the same deformation sequence: uniform elongation followed by diffuse necking, then localized necking (in the forms of crossed intense shear bands) and finally fracture. The difference among these alloys lies primarily with respect to the point in the process at which damage (i.e. voiding) starts. A microstructurally based finite element model has been developed to reproduce this characteristic deformation sequence. The predicted specimen shape change, shear band characteristics, distribution of strain and the fracture modes are all in good agreement with the experimental observations. It has also been established that (1) damage is not responsible for the occurrence of localization; and (2) localization depends sensitively on macroscopic factors such as the strain hardening rate, r-value and the specimen geometry. The characteristic of the intense shear bands can be also predicted with high accuracy without consideration of microstructural details, such as Piobert- Lüders (PL), PortevinLe Chatelier (PLC) bands and orange peels, provided the strain hardening rate is accurately represented in the models. |
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