Theory of single point incremental forming

Martins, P.A.F.; Bay, Niels; Skjoedt, M.; Silva, M.B.

doi:10.1016/j.cirp.2008.03.047

Cited by 249 publications

(113 citation statements)

References 3 publications

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“…A theoretical model for the different modes of deformation is commonly found in SPIF, built upon membrane analysis and ductile damage mechanics by Martins et al [55]. Experimental observations show that fracture is not preceded by localized necking, and the crack develops under tensile meridional stresses acting under stretching conditions (Fig.…”

Section: Stresses and Strains In Spifmentioning

confidence: 99%

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Review on the influence of process parameters in incremental sheet forming

Gatea

McCartney

2016

Int J Adv Manuf Technol

157

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Incremental sheet forming (ISF) is a relatively new flexible forming process. ISF has excellent adaptability to conventional milling machines and requires minimum use of complex tooling, dies and forming press, which makes the process cost-effective and easy to automate for various applications. In the past two decades, extensive research on ISF has resulted in significant advances being made in fundamental understanding and development of new processing and tooling solutions. However, ISF has yet to be fully implemented to mainstream high-value manufacturing industries due to a number of technical challenges, all of which are directly related to ISF process parameters. This paper aims to provide a detailed review of the current state-of-the-art of ISF processes in terms of its technological capabilities and specific limitations with discussions on the ISF process parameters and their effects on ISF processes. Particular attention is given to the ISF process parameters on the formability, deformation and failure mechanics, springback and accuracy and surface roughness. This leads to a number of recommendations that are considered essential for future research effort.

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Section: Stresses and Strains In Spifmentioning

confidence: 99%

“…11, including the following: (A) plane strain stretching conditions in flat surfaces; (B) plane strain stretching conditions in rotational symmetric surfaces and (C) equal bi-axial stretching conditions at corners. Additionally, there are possibilities of other deformation modes between these modes [55].…”

Section: Deformation and Failure Mechanics In Spifmentioning

confidence: 99%

Review on the influence of process parameters in incremental sheet forming

Gatea

McCartney

2016

Int J Adv Manuf Technol

157

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“…Extensive research has been published on SPIF for improved understanding of material deformation and fracture mechanisms of SPIF to form a part without defects. A theoretical model for different modes of deformation in SPIF was built upon membrane analysis and ductile damage mechanics by Martins, Silva and co-workers [1,2]. Experimental observations show that fracture is not preceded by localised necking and cracks develop by tensile meridional stresses under stretching conditions but not by plane shear stresses.…”

Section: Introductionmentioning

confidence: 99%

Modelling of ductile fracture in single point incremental forming using a modified GTN model

Gatea

Lü

et al. 2017

Engineering Fracture Mechanics

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A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. t r a c tUnderstanding the deformation and failure mechanisms in single point incremental forming (SPIF) is of great importance for achieving improved formability. Furthermore, there will be added benefits for more in depth evaluation of the effect of localised deformation to the fracture mechanism in SPIF. Although extensive research has been carried out in recent years, questions still remain on the shear and particularly its effect to the formability in SPIF processes. In this work, a modified Gurson-Tvergaard-Needleman (GTN) damage model was developed with the consideration of shear to predict ductile fracture in the SPIF process due to void nucleation and coalescence with results compared with original GTN model in SPIF. A combined approach of experimental testing and SPIF processing was used to validate finite element results of the shear modified Gurson-Tvergaard-Needleman damage model. The results showed that the shear modified GTN model improved the modelling accuracy of fracture over the original GTN model under shear loading conditions. Furthermore, the shear plays a role under meridional tensile stress to accelerate fracture propagation in SPIF processes.

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“…These movements produce a plastic deformation located in a small region of the sheet. This region changes according to the tool's movement and progressively causes deformation to occur, thus increasing the conformability of the sheet when compared with conventional forming processes (Martins et al, 2008).…”

Section: -Implant Manufacturing By Incremental Sheet Forming (Isf)mentioning

confidence: 99%

Manufacture of custom-made cranial implants from DICOM® images using 3D printing, CAD/CAM technology and incremental sheet forming

Castelan¹,

Schaeffer

Daleffe

et al. 2014

Rev. Bras. Eng. Bioméd.

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Introduction: This work aims to pre-operatively manufacture custom-made low-cost implants and physical models ('biomodels') of fractured skulls. The pre-operative manufacturing of biomodels and implants allows physicians to study and plan surgery with a greater possibility of achieving the expected result. Customization contributes to both the esthetic and functional outcome of the implant because it considers the anatomy of each patient, while the low cost allows a greater number of people to potentially benefi t. Methods: From CT images of a fractured skull, a CAD model of the skull (biomodel) and a restorative implant were constructed digitally. The biomodel was then physically constructed with 3D Printing, and Incremental Sheet Forming (ISF) was used to manufacture the implant from a sheet of pure grade 2 titanium. Before cutting the implant's fi nal shape from a pre-formed sheet, heat treatment was performed to avoid deformations caused by residual stresses generated during the ISF process. Results: A comparison of the dimensions of the implant and its respective CAD biomodel revealed geometric discrepancies that can affect both functional and aesthetic effi ciency. Nevertheless, the fi nal shape preserved symmetry between the right and left sides of the skull. Electron microscopy analysis did not indicate the presence of elements other than pure titanium. Conclusions: Dimensional variability can be decreased with changes in the manufacturing process (i.e., forming and cutting) and the heating ramp. Despite biomedical characteristics, there was no contamination of the implant by harmful chemical elements. 3D Printing was effective in making the biomodel, enabling pre-operative planning and improving physicianpatient communication. Current results indicate that ISF is a process that can be used to obtain custom-made implants.

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Theory of single point incremental forming

Cited by 249 publications

References 3 publications

Review on the influence of process parameters in incremental sheet forming

Review on the influence of process parameters in incremental sheet forming

Modelling of ductile fracture in single point incremental forming using a modified GTN model

Manufacture of custom-made cranial implants from DICOM® images using 3D printing, CAD/CAM technology and incremental sheet forming

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