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

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-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 languageEnglish
Title of host publicationMaterials Research Proceedings
EditorsG. Meschut, M. Bobbert, J. Duflou, L. Fratini, H. Hagenah, P. Martins, M. Merklein, F. Micari
Volume52
PublisherMaterials Research Forum LLC
Publication date2025
Pages242-249
ISBN (Print)978-1-64490-354-4
DOIs
Publication statusPublished - 2025
EventSheet Metal 2025: 21th International Conference on Sheet Metal - Paderborn University, Paderborn, Germany
Duration: 1 Apr 20253 Apr 2025

Conference

ConferenceSheet Metal 2025
LocationPaderborn University
Country/TerritoryGermany
CityPaderborn
Period01/04/202503/04/2025

Keywords

  • Additive Manufacturing
  • Forming
  • Nakajima Test

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