Formability Assessment of Additively Manufactured Materials via Dieless Nakajima Testing

This paper delves into the formability of material deposited by wire arc additive manufacturing. It presents a novel dieless Nakajima testing procedure that offers a practical solution for obtaining strain loading paths up to failure directly from the deposited material without the need for extracti...

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Bibliographic Details
Published in:Journal of Manufacturing and Materials Processing 2024-08, Vol.8 (4), p.180
Main Authors: Sampaio, Rui F V, Rosado, Pedro M S, Pragana, João P M, Bragança, Ivo M F, Silva, Carlos M A, Rosa, Luís G, Martins, Paulo A F
Format: Article
Language:English
Subjects:
Additive manufacturing
Arc deposition
Dieless
Digital imaging
Energy consumption
experimentation
Finite element method
Formability
Hybridization
Machining
Metal forming
Nakajima test
Raw materials
Residual stress
Software
Stainless steel
Strain
Tension tests
Test procedures
wire arc additive manufacturing
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Summary:This paper delves into the formability of material deposited by wire arc additive manufacturing. It presents a novel dieless Nakajima testing procedure that offers a practical solution for obtaining strain loading paths up to failure directly from the deposited material without the need for extracting sheet blanks. The procedure involved machining a region of the deposited material to the desired shape and thickness and using a press to drive and control the movement of a hemispherical punch. The test was designed using finite element modeling, and its effectiveness in obtaining the required strain loading paths directly from the deposited material was verified through experimentation with digital image correlation. Importantly, this novel test eliminates the need for the special-purpose tool setup required in conventional Nakajima sheet formability tests, thereby simplifying the overall testing process.
ISSN:2504-4494
DOI:10.3390/jmmp8040180