Abstract
If a strip is pulled over a curved tool there is a contact stress acting on the strip. This contact stress changes the stress state in the material, which is analysed with a simple model. One effect is that the yield stress in tension is reduced. Predictions by the model agree with observation from a 90-degree bending test found in literature, and indirectly with observation from a stretch-bend test also found in literature. Another effect is that a change in stress state also affects the formability. This is analyzed by applying the maximum force condition on this situation. The predictions agree with a more thorough analysis of the effect of thickness stress in general, but the predictions of both methods are lower than actually observed in tests. There may be other mechanisms at work, and one candidate is presented.
| Original language | English |
|---|---|
| Pages (from-to) | 1159-1162 |
| Number of pages | 4 |
| Journal | International journal of material forming |
| Volume | 3 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 7 Apr 2010 |
| Event | ESAFORM 2010: 13th International ESAFORM Conference on Material Forming - Brescia, Italy Duration: 7 Apr 2010 → 9 Apr 2010 Conference number: 13 |
Keywords
- Contact stress
- Bending
- IR-72546
- METIS-267350
- Formability
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Emmens, W. C., & van den Boogaard, A. H. (2010). Contact effects in bending affecting stress and formability. International journal of material forming, 3(1), 1159-1162. https://doi.org/10.1007/s12289-010-0978-7