caa a22 4500 467913811 CHVBK 20180406152856.0 cr unu---uuuuu 170328e20061201xx s 000 0 eng 10.1007/s10999-007-9040-4 doi (NATIONALLICENCE)springer-10.1007/s10999-007-9040-4 Nosing of thin-walled hollow spheres using a die: experimental and theoretical investigation [Elektronische Daten] [Luis Alves, Pedro Vilaça, Paulo Martins] In contrast to end forming of tubes, there is no published work that addresses the manufacturing of thin-walled hollow spheres by nosing using a die. Important characteristics of the process such as the development of plastic instability modes (local buckling), thickening of the tube-wall and occurrence of wrinkling needs to be properly studied. This paper presents a numerical and experimental investigation of the nosing of thin-walled hollow spheres using a die with the purpose of examining the process mechanics, obtaining a better understanding of the modes of deformation and establishing the formability limits in terms of the major process parameters. The paper also presents a new concept of nosing thin-walled hollow spheres that makes use of preforming stages and tube-end preparation schemes in order to successfully extend the formability limits of the process. Theoretical investigation and process development are supported by numerical predictions based on the finite element flow formulation and the overall methodology is assessed by means of experimental tests on industrial AA6060 Aluminium alloy tubes (natural aged) under laboratory-controlled conditions. Springer Science+Business Media B.V., 2007 Nosing of hollow spheres nationallicence Process development nationallicence Experimentation nationallicence Finite element modelling nationallicence Alves Luis IDMEC, Instituto Superior Técnico, TULisbon, Av. Rovisco Pais, 1049-001, Lisboa, Portugal aut Vilaça Pedro IDMEC, Instituto Superior Técnico, TULisbon, Av. Rovisco Pais, 1049-001, Lisboa, Portugal aut Martins Paulo IDMEC, Instituto Superior Técnico, TULisbon, Av. Rovisco Pais, 1049-001, Lisboa, Portugal aut International Journal of Mechanics and Materials in Design Springer Netherlands 3/4(2006-12-01), 337-346 1569-1713 3:4<337 2006 3 10999 https://doi.org/10.1007/s10999-007-9040-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10999-007-9040-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Alves Luis IDMEC, Instituto Superior Técnico, TULisbon, Av. Rovisco Pais, 1049-001, Lisboa, Portugal aut NATIONALLICENCE 700 1- Vilaça Pedro IDMEC, Instituto Superior Técnico, TULisbon, Av. Rovisco Pais, 1049-001, Lisboa, Portugal aut NATIONALLICENCE 700 1- Martins Paulo IDMEC, Instituto Superior Técnico, TULisbon, Av. Rovisco Pais, 1049-001, Lisboa, Portugal aut NATIONALLICENCE 773 0- International Journal of Mechanics and Materials in Design Springer Netherlands 3/4(2006-12-01), 337-346 1569-1713 3:4<337 2006 3 10999 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer