Abstract
Finite element models were constructed to simulate forming of a long rectangular tray. Control algorithms were developed to predict pressure history by maintaining a constant strain rate throughout forming. These forming cycles were applied in superplastic forming press, and partially and fully formed trays were produced to compare with finite element predictions. The partially formed tray touches the bottom of the die at time equal to that predicted by the model, indicating that the constitutive and friction models correctly simulate the forming process. Trays were sectioned and thinning profiles were measured in the width-wise, length-wise, and the diagonal corner directions. Comparisons between the predicted thinning profiles and the measured ones for partially and completely formed trays are described. Based on these results, it appears that the coefficient of friction varies somewhat over time. An average coefficient of friction of 0.4 provides reasonably good agreement between the predicted and measured thinning profiles for completely formed trays.
| Original language | English |
|---|---|
| Pages (from-to) | 739-744 |
| Number of pages | 6 |
| Journal | Materials Science Forum |
| Volume | 243-245 |
| State | Published - 1997 |
| Externally published | Yes |
Keywords
- Aluminum Alloy
- Constitutive Relations
- Finite Element Analysis
- Forming
- Modeling