A dieless Nakajima test for additively deposited materials

Rui F.V.  Sampaioa; Pedro  M.S. Rosado; João  P.M. Pragana; Ivo M.F.  Bragança; Chris V. Nielsen; Carlos M.A.  Silva; Paulo A.F. Martins

doi:10.21741/9781644903551-30

A dieless Nakajima test for additively deposited materials

Rui F.V. Sampaioa^*
, Pedro M.S. Rosado
, João P.M. Pragana
, Ivo M.F. Bragança
, Chris V. Nielsen
, Carlos M.A. Silva
, Paulo A.F. Martins

^*Corresponding author for this work

University of Lisbon
Technical University of Lisbon

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

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Abstract

This paper focuses on a novel Nakajima test for characterizing the formability of additively deposited materials without extracting sheet blanks. Material is deposited by wire-arc additive manufacturing in the form of ‘Π-shaped’ vertical walls, and the testing regions are then machined to the desired thickness and shapes for subsequent deformation with a hemispherical punch in a press. Digital image correlation is used to obtain the strain loading paths of the deposited material up to failure. The novel test eliminates the need for the special-purpose tool setup of conventional Nakajima tests, simplifying the overall procedure and reducing costs.

Original language	English
Title of host publication	Materials Research Proceedings
Editors	G. Meschut, M. Bobbert, J. Duflou, L. Fratini, H. Hagenah, P. Martins, M. Merklein, F. Micari
Volume	52
Publisher	Materials Research Forum LLC
Publication date	2025
Pages	242-249
ISBN (Print)	978-1-64490-354-4
DOIs	https://doi.org/10.21741/9781644903551-30
Publication status	Published - 2025
Event	Sheet Metal 2025: 21th International Conference on Sheet Metal - Paderborn University, Paderborn, Germany Duration: 1 Apr 2025 → 3 Apr 2025

Conference

Conference	Sheet Metal 2025
Location	Paderborn University
Country/Territory	Germany
City	Paderborn
Period	01/04/2025 → 03/04/2025

Keywords

Additive Manufacturing
Forming
Nakajima Test

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Sampaioa, R. F. V., M.S. Rosado, P., P.M. Pragana, J., Bragança, I. M. F., Nielsen, C. V., Silva, C. M. A., & Martins, P. A. F. (2025). A dieless Nakajima test for additively deposited materials. In G. Meschut, M. Bobbert, J. Duflou, L. Fratini, H. Hagenah, P. Martins, M. Merklein, & F. Micari (Eds.), Materials Research Proceedings (Vol. 52, pp. 242-249). Materials Research Forum LLC. https://doi.org/10.21741/9781644903551-30

@inproceedings{d87cb2dcc77e4161a0aed33eb0acba53,

title = "A dieless Nakajima test for additively deposited materials",

abstract = "This paper focuses on a novel Nakajima test for characterizing the formability of additively deposited materials without extracting sheet blanks. Material is deposited by wire-arc additive manufacturing in the form of {\textquoteleft}Π-shaped{\textquoteright} vertical walls, and the testing regions are then machined to the desired thickness and shapes for subsequent deformation with a hemispherical punch in a press. Digital image correlation is used to obtain the strain loading paths of the deposited material up to failure. The novel test eliminates the need for the special-purpose tool setup of conventional Nakajima tests, simplifying the overall procedure and reducing costs.",

keywords = "Additive Manufacturing, Forming, Nakajima Test",

author = "Sampaioa, \{Rui F.V.\} and \{M.S. Rosado\}, Pedro and \{P.M. Pragana\}, Jo{\~a}o and Bragan{\c c}a, \{Ivo M.F.\} and Nielsen, \{Chris V.\} and Silva, \{Carlos M.A.\} and Martins, \{Paulo A.F.\}",

year = "2025",

doi = "10.21741/9781644903551-30",

language = "English",

isbn = "978-1-64490-354-4 ",

volume = "52",

pages = "242--249",

editor = "Meschut, \{G. \} and Bobbert, \{M. \} and Duflou, \{J. \} and Fratini, \{L. \} and Hagenah, \{H. \} and Martins, \{P. \} and Merklein, \{M. \} and Micari, \{F. \}",

booktitle = "Materials Research Proceedings",

publisher = "Materials Research Forum LLC",

note = "Sheet Metal 2025 : 21th International Conference on Sheet Metal ; Conference date: 01-04-2025 Through 03-04-2025",

}

Sampaioa, RFV, M.S. Rosado, P, P.M. Pragana, J, Bragança, IMF, Nielsen, CV, Silva, CMA & Martins, PAF 2025, A dieless Nakajima test for additively deposited materials. in G Meschut, M Bobbert, J Duflou, L Fratini, H Hagenah, P Martins, M Merklein & F Micari (eds), Materials Research Proceedings. vol. 52, Materials Research Forum LLC, pp. 242-249, Sheet Metal 2025, Paderborn, Germany, 01/04/2025. https://doi.org/10.21741/9781644903551-30

A dieless Nakajima test for additively deposited materials. / Sampaioa, Rui F.V. ; M.S. Rosado, Pedro ; P.M. Pragana, João et al.
Materials Research Proceedings. ed. / G. Meschut; M. Bobbert; J. Duflou; L. Fratini; H. Hagenah; P. Martins; M. Merklein; F. Micari. Vol. 52 Materials Research Forum LLC, 2025. p. 242-249.

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

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T1 - A dieless Nakajima test for additively deposited materials

AU - Sampaioa, Rui F.V.

AU - M.S. Rosado, Pedro

AU - P.M. Pragana, João

AU - Bragança, Ivo M.F.

AU - Nielsen, Chris V.

AU - Silva, Carlos M.A.

AU - Martins, Paulo A.F.

PY - 2025

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N2 - This paper focuses on a novel Nakajima test for characterizing the formability of additively deposited materials without extracting sheet blanks. Material is deposited by wire-arc additive manufacturing in the form of ‘Π-shaped’ vertical walls, and the testing regions are then machined to the desired thickness and shapes for subsequent deformation with a hemispherical punch in a press. Digital image correlation is used to obtain the strain loading paths of the deposited material up to failure. The novel test eliminates the need for the special-purpose tool setup of conventional Nakajima tests, simplifying the overall procedure and reducing costs.

AB - This paper focuses on a novel Nakajima test for characterizing the formability of additively deposited materials without extracting sheet blanks. Material is deposited by wire-arc additive manufacturing in the form of ‘Π-shaped’ vertical walls, and the testing regions are then machined to the desired thickness and shapes for subsequent deformation with a hemispherical punch in a press. Digital image correlation is used to obtain the strain loading paths of the deposited material up to failure. The novel test eliminates the need for the special-purpose tool setup of conventional Nakajima tests, simplifying the overall procedure and reducing costs.

KW - Additive Manufacturing

KW - Forming

KW - Nakajima Test

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DO - 10.21741/9781644903551-30

M3 - Article in proceedings

SN - 978-1-64490-354-4

VL - 52

SP - 242

EP - 249

BT - Materials Research Proceedings

A2 - Meschut, G.

A2 - Bobbert, M.

A2 - Duflou, J.

A2 - Fratini, L.

A2 - Hagenah, H.

A2 - Martins, P.

A2 - Merklein, M.

A2 - Micari, F.

PB - Materials Research Forum LLC

T2 - Sheet Metal 2025

Y2 - 1 April 2025 through 3 April 2025

ER -

A dieless Nakajima test for additively deposited materials

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