Investigation of material deformation mechanism in double side incremental sheet forming

Lü, Bin; Fang, Yanan; Xu, Dongkai; Chen, J.; Ai, Sheng; Long, Hui; Ou, Hengan; Cao, Jian

doi:10.1016/j.ijmachtools.2015.03.007

Cited by 92 publications

(62 citation statements)

References 29 publications

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“…The deformation mechanism and fracture behaviour of double point incremental forming has been investigated based on the membrane analysis and experimental work. It was found that by using different supporting force and tool shift the FLCF can be increased as compared with SPIF [11]. An analytical model was developed with the consideration of bending effect and strain hardening to describe the localised deformation in ISF.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of formability and fracture of pure titanium in incremental sheet forming

Gatea

et al. 2017

Int J Adv Manuf Technol

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A forming limit diagram (FLD) is commonly used as a useful means for characterising the formability of sheet metal forming processes. In this study, the Nakajima test was used to construct the forming limit curve at necking (FLCN) and fracture (FLCF). The results of the FLCF are compared with incremental sheet forming (ISF) to evaluate the ability of the Nakajima test to describe the fracture in ISF. Tests were carried out to construct the forming limit diagram at necking and fracture to cover the strain states from uniaxial tension to equi-biaxial tension with different stress triaxialities-from 0.33 for uniaxial tension to 0.67 for equi-biaxial tension. Due to the fact that the Gurson-Tvergaard-Needleman (GTN) model can be used to capture fracture occurrence at high stress triaxiality, and the shear modified GTN model (Nahshon-Hutchinson's shear mechanism) was developed to predict the fracture at zero stress or even negative stress triaxiality, the original GTN model and shear modified GTN model may be not suitable to predict the fracture in all samples of the Nakajima test as some samples are deformed under moderate stress triaxiality. In this study, the fractures are compared using the original GTN model, shear modified GTN model and the Nielsen-Tvergaard model with regard to stress triaxiality. To validate the ability of these models, and to assess which model is more accurate in predicting the fracture with different stress triaxialities, finite element (FE) simulations of the Nakajima test were compared with an experimental results to evaluate the applicability of the Nakajima test to characterise the fracture from ISF. The experimental and FE results showed that the shear modified GTN model could predict the fracture accurately with samples under uniaxial tension condition due to low stress triaxiality and that the original GTN model is suitable for an equi-biaxial strain state (high stress triaxiality), whereas the stress triaxiality modified GTN model should be considered for samples which have moderate stress triaxiality (from plain strain to biaxial strain). The numerical and experimental FLCF of pure titanium from the Nakajima test showed a good agreement between the experimental and numerical results of ISF.

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Section: Introductionmentioning

confidence: 99%

Evaluation of formability and fracture of pure titanium in incremental sheet forming

Gatea

et al. 2017

Int J Adv Manuf Technol

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“…In recent development, a number of variations of the ISF processes were proposed, such as the conventional singlepoint incremental forming (SPIF) [4], the two-point incremental forming (TPIF) [5], the hybrid incremental forming [6], and the double-side incremental forming (DSIF) [7]. In all these processes, a rigid tool has to be employed to deform the sheet blank.…”

Section: Introductionmentioning

confidence: 99%

A study of incremental sheet forming by using water jet

Lü

Bazeer

Cao

et al. 2017

Int J Adv Manuf Technol

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In this work, a variant of the incremental sheet forming (ISF) process, namely the incremental sheet forming by using water jet (ISF-WJ), was studied. In the investigation, an ISF-WJ prototype machine was designed and developed. Different design concepts of the water jet nozzle were proposed and evaluated to achieve the maximum forming pressure by performing computational fluid dynamic (CFD) simulations. Based on the forming pressure distribution modeled by CFD simulations, finite element (FE) models were developed to study the sheet deformation behavior under the ISF-WJ process condition. Based on the understanding gained from the numerical study, experiments were conducted to validate the ISF-WJ process and the developed prototype machine. The results suggest that ISF-WJ is a feasible process to achieve improved surface finish of thin sheet parts. In addition, this study has found that water jet pressure plays an important role in preventing sheet wrinkling and obtaining an accurate geometry of formed parts.

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“…Bagudanch et al (2014) concluded that the Marlow and the rule of mixture material models could be used to describe viscoelastic and softening and permanent set effects, respectively, to predict the behavior of a part formed by ISF. Lu et al (2015) investigated that by employing two forming tools on each side of the sheet, DSIF process can provide additional process flexibility, compared to the conventional single point incremental forming (SPIF) process, therefore to produce complex geometries without the need of using a backing plate or supporting die. Shrivastava and Tandon (2015) performed experiments on samples heat treated at different temperatures and hence, different grains to evaluate the effect of forming forces.…”

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confidence: 99%

Analysis of Pressure Assisted Incremental Sheet Forming Process through Simulation

Kumar¹,

Tjprc²

2018

IJMPERD

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Incremental sheet forming (ISF) process is a flexible manufacturing process to produce complex 3D products at reasonable manufacturing cost. In addition to a single point, incremental sheet forming pressure has been applied to the back side of sheet surface in order to provide support to the sheet surface and improve process efficiency. In the current work, a comparative analysis of ISF & pressure assisted ISF process through CAE simulation have been done to predict the forming forces, energy requirements, effective stresses, etc. The forming forces in ISF as well as pressure-assisted ISF is very low when as compared to forming forces in traditional forming processes. The pressure-induced ductility hasresulted in the reduction of forming forces with pressure assisted ISF. The energy required in pressure assisted ISF is slightly higher than the ISF process. An increment in effective stresses is observed in pressure assisted ISF, which is a due application of force on both sides of the sheet. However, these stresses are local and very small when as compared to traditional forming processes.

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Investigation of material deformation mechanism in double side incremental sheet forming

Abstract: This is a repository copy of Investigation of material deformation mechanism in double side incremental sheet forming.

Cited by 92 publications

References 29 publications

Evaluation of formability and fracture of pure titanium in incremental sheet forming

Evaluation of formability and fracture of pure titanium in incremental sheet forming

A study of incremental sheet forming by using water jet

Analysis of Pressure Assisted Incremental Sheet Forming Process through Simulation

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