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Velotti C, Astarita A, Squillace A, Ciliberto S, Villano MG, Giuliani M, Prisco U, Montuori M, Giorleo G, Bellucci F. On the critical technological issues of friction stir welding lap joints of dissimilar aluminum alloys. SURF INTERFACE ANAL 2013. [DOI: 10.1002/sia.5277] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- C. Velotti
- Department of Materials and Production Engineering; University of Naples Federico II; 80125 Naples Italy
| | - A. Astarita
- Department of Materials and Production Engineering; University of Naples Federico II; 80125 Naples Italy
| | - A. Squillace
- Department of Materials and Production Engineering; University of Naples Federico II; 80125 Naples Italy
| | - S. Ciliberto
- Department of Materials and Production Engineering; University of Naples Federico II; 80125 Naples Italy
| | - M. G. Villano
- OMI Officine Meccaniche Irpine S.r.l.; Area Ind.le Caleggio; 83046 Lacedonia Italy
| | - M. Giuliani
- OMI Officine Meccaniche Irpine S.r.l.; Area Ind.le Caleggio; 83046 Lacedonia Italy
| | - U. Prisco
- Department of Materials and Production Engineering; University of Naples Federico II; 80125 Naples Italy
| | - M. Montuori
- Department of Materials and Production Engineering; University of Naples Federico II; 80125 Naples Italy
| | - G. Giorleo
- Department of Materials and Production Engineering; University of Naples Federico II; 80125 Naples Italy
| | - F. Bellucci
- Department of Materials and Production Engineering; University of Naples Federico II; 80125 Naples Italy
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Abstract
In this paper the range within which the slab method is accurate enough to calculate the extrusion pressure in superplastic condition has been determined. A realistic velocity field, supported by experimental evidence, has been adopted. A strain rate field has been evaluated and an appropriate constitutive equation has been introduced. The slab method and the upper bound approach, here developed, have then been used to study the superplastic extrusion through a conical die. A comparison of the two solutions thus obtained has been carried out. It has been found that in any case the curves obtained using the slab method run higher than those obtained using the upper-bound approach. The analysis developed may be used to determine the range within the slab method is accurate enough for engineering purposes.
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Affiliation(s)
- A. Alto
- Istituto di Tecnologie, Universita di Bari, Bari, Italy
| | - G. Giorleo
- Istituto di Ingegneria, Universita di Salerno, Salerno, Italy
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