Results 1 to 10 of about 15,674,212 (215)
Formability Assessment of Additively Manufactured Materials via Dieless Nakajima Testing
Journal of Manufacturing and Materials ProcessingThis 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 ...
Rui F V Sampaio +2 more
exaly +5 more sources
Fully-coupled micro–macro finite element simulations of the Nakajima test using parallel computational homogenization [PDF]
Computational Mechanics, 2021 AbstractThe Nakajima test is a well-known material test from the steel and metal industry to determine the forming limit of sheet metal. It is demonstrated how FE2TI, our highly parallel scalable implementation of the computational homogenization method FE$$^2$$ 2
Axel Klawonn +2 more
exaly +6 more sources
International Journal of Mechanical Sciences, 2021 Abstract Recently, a biaxial test method comprising a cruciform specimen design and spatio-temporal method to determine the limit strains has been proposed for the determination of forming limit curves (FLCs) and fracture forming limit curves (FFLCs) for sheet metals.
Zhusheng Shi +2 more
exaly +4 more sources
Crystals, 2023 Within the framework of the formability limit assessment in sheet metal forming, testing of notched tensile samples coupled with digital image correlation (DIC) has been analysed as an alternative to overcome the implications of Nakajima testing in ...
Ahmed Elsayed +2 more
doaj +2 more sources
IOP Conference Series: Materials Science and Engineering, 2021 Abstract One sustainability approach in sheet metal forming is to reduce costs by increasing the reliability of the forming process by applying numerical simulations. These are based upon the finite element analysis and require specific characteristic values of the material.
D Kohl, M Merklein
openaire +2 more sources
IOP Conference Series: Materials Science and Engineering, 2019 Abstract The prediction of necking in sheet-metal forming is one of the most important tasks in the simulation of forming processes. The most common way to predict the necking for linear load paths is the Forming Limit Diagram (FLD) according to ISO 12004-2. This criterion is valid only for linear load paths. For non-proportional loading
R. Norz, W. Volk
openaire +2 more sources
A dieless Nakajima test for additively deposited materials
Materials Research ProceedingsAbstract. 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 ...
Sampaioa, Rui F.V. +6 more
openaire +2 more sources
Metallographic Analysis of Nakajima Tests for the Evaluation of the Failure Developments
Procedia Engineering, 2017 Abstract The material characterisation in sheet metal forming is significantly improved with the introduction of optical measurement systems. The optical measurement is based on the digital image correlation (DIC) technique, which provides accurate strain measurement of the local strain distribution on specimens.
Affronti Emanuela, Merklein Marion
openaire +2 more sources
Comparison of nonlinear strain path correction models for the FLD characterization [PDF]
MATEC Web of ConferencesThe Forming Limit Diagram (FLD), along with the Forming Limit Curve (FLC) it encompasses, are widely used tools in sheet metal forming to predict the forming behavior of sheet metal.
Mainguy Grégoire +2 more
doaj +2 more sources
IOP Conference Series: Materials Science and Engineering, 2018 The material characterization is the first step for an accurate numerical design of forming operations. Since its first definition in the 1960s, the forming limit curve (FLC), usually evaluated with Nakajima or Marciniak tests, is still one of the most used criteria in the industrial and scientific field for the determination of the forming limits ...
Emanuela Affronti +2 more
openaire +2 more sources