Coupled Finite Element Flow Formulation

Nielsen, Chris Valentin; Zhang, W.; Alves, L.M.; Bay, Niels; Martins, P.A.F.

doi:10.1007/978-1-4471-4643-8_3

Cited by 24 publications

(18 citation statements)

References 19 publications

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“…The numerical simulation of the new joining by tube flaring and sheet squeezing process was carried out with the finite element computer program i-form [ 20 ]. The program was developed by the authors and is based on the finite element flow formulation, which is built upon the weak form of the quasi-static force equilibrium Equation (1),

…”

Section: Methodsmentioning

confidence: 99%

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Single-Stroke Attachment of Sheets to Tube Ends Made from Dissimilar Materials

et al. 2021

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This paper presents a new joining method by a forming process for attaching sheets to tube ends. The process consists of two different forming stages carried out sequentially in a single stroke. Firstly, the free tube end is flared by compression with a contoured die, then is squeezed (indented) against the sheet surface to create a mechanical interlocking. The new process is carried out at an ambient temperature and, in contrast to existing joining by forming operations based on tube expansion, it avoids seal welds, tube protrusions above the sheet surfaces, and machining of grooves on the sheet holes to obtain the form‑fit joints. The paper starts by analyzing the process deformation mechanics and its main operating variables and finishes by presenting examples that demonstrate its effectiveness for attaching sheets to tube ends made from polyvinylchloride and aluminum. Experimental and numerical simulation work provides support to the presentation.

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…”

Section: Methodsmentioning

confidence: 99%

“…The symbols

and

stand for the normal and tangential gap velocities in the contact pairs, which are penalized by large numbers

and

to avoid penetration. Details are given in Nielsen et al [ 20 ].…”

Section: Methodsmentioning

confidence: 99%

Single-Stroke Attachment of Sheets to Tube Ends Made from Dissimilar Materials

et al. 2021

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“…The absence of inertia and dynamic effects, allowed authors to simulate the process with an in-house computer program built upon the quasi-static finite element flow formulation. The computer implementation of the flow formulation was based on the extended rigid-plastic Markov’s principle of minimum plastic work to include incompressibility and contact between deformable bodies 12 …”

Section: Methods and Proceduresmentioning

confidence: 99%

“…Details of the computer implementation of the extended rigid-plastic Markov’s principle (1) are given in Nielsen et al. 12…”

Section: Methods and Proceduresmentioning

confidence: 99%

Invisible mechanical lap joints for metal–polymer laminates

Batista

Pragana

Bragança

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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Joining by compression of metallic inserts has been recently developed by the authors to create invisible lap joints between metal and polymer laminates. This paper revisits the process with the objective of proposing a new type of bi-material (polymer–metal) cylindrical insert for lightweight construction applications that is capable of ensuring complete filling of the joint at the end of stroke without increasing the forming force and the risk of sheet bending. The presentation is built upon a combined experimental and finite element research work focused on the modes of deformation, formability limits, forming forces, and resistance strength that lap joints produced with the new bi-material cylindrical inserts are able to withstand before failing. Results allowed designing a simple and easy to fabricate bi-material cylindrical insert that overcomes the main problems that have been pointed out to the metallic inserts earlier proposed by the authors.

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“…The numerical simulations of coin minting were performed with the in-house finite element computer program i-form. 17,18 The program is based on the finite element flow formulation which is built upon the weak form of the quasi-static equilibrium equations,…”

Section: Numerical Simulationmentioning

confidence: 99%

Coin minting by additive manufacturing and forming

Pragana

Rosenthal

Alexandrino³

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part B:

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Additive manufacturing is proposed as a novel alternative to coin blank’s production routes based on rolling, blanking and edge rimming. The presentation draws from laser powder bed fusion of cylinders, slicing into individual coin blanks by electro discharge machining and surface preparation by polishing, to coin minting in a laboratory press-tool system. Special emphasis is given to material deposition and coin minting due to the originality of producing coin blanks with complex intricate contoured holes and to the necessity of subjecting the additive manufactured coin blanks to extreme compressive stresses that are typical of coin minting. Numerical and experimental results confirm the excellent performance of the additive manufactured coin blanks. The new design layouts included in the additive manufactured coin blanks open the way to produce high value-added singular collector coins, which are disruptively different from those available in the market nowadays.

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Coupled Finite Element Flow Formulation

Cited by 24 publications

References 19 publications

Single-Stroke Attachment of Sheets to Tube Ends Made from Dissimilar Materials

Single-Stroke Attachment of Sheets to Tube Ends Made from Dissimilar Materials

Invisible mechanical lap joints for metal–polymer laminates

Coin minting by additive manufacturing and forming

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