A dieless Nakajima test for additively deposited materials
Rui F.V. Sampaio, Pedro M.S. Rosado, João P.M. Pragana, Ivo M.F. Bragança, Chris V. Nielsen, Carlos M.A. Silva, Paulo A.F. Martins
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.
Keywords
Additive Manufacturing, Forming, Nakajima Test
Published online 4/1/2025, 8 pages
Copyright © 2025 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA
Citation: Rui F.V. Sampaio, Pedro M.S. Rosado, João P.M. Pragana, Ivo M.F. Bragança, Chris V. Nielsen, Carlos M.A. Silva, Paulo A.F. Martins, A dieless Nakajima test for additively deposited materials, Materials Research Proceedings, Vol. 52, pp 242-249, 2025
DOI: https://doi.org/10.21741/9781644903551-30
The article was published as article 30 of the book Sheet Metal 2025
Content from this work may be used under the terms of the Creative Commons Attribution 3.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
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