Finite element determination of workability limits for disks and rings under different upsetting conditions
✍ Scribed by A.S. Wifi; A. Abdel-Hamid; H. El-Monayri; N. El-Abbasi
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 906 KB
- Volume
- 56
- Category
- Article
- ISSN
- 0924-0136
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✦ Synopsis
In the present work, an updated Lagrangian, elasto-plastic large strain finite element code is used to simulate the process of upsetting of disks and rings with full account of the frictional contact boundary conditions. Workability limits are predicted using the strain-based fracture criterion of Kuhn and Lee as well as a stress-based one of Shabaik and Vujovic. It is found that the workability limits predicted by Shabaik fracture criterion fit a Kuhn type fracture line with a slope of minus one half but with ordinate intercepts for the upsetting of disks different than that for rings. The predicted workability limits are compared with those published using rigid plastic finite element solution; some minor differences are reported. Furthermore, a comparative discussion of a number of fracture criteria is given and disagreement among them is highlighted.