Investigating formability enhancement in double side incremental forming by developing a new test method of tension under cyclic bending and compression

Ai, Sheng; Dai, Rui; Long, Hui

doi:10.1016/j.jmatprotec.2019.116349

Cited by 15 publications

(10 citation statements)

References 29 publications

(37 reference statements)

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“…A new test method for evaluating the formability in double side incremental forming has been proposed by Ai et al [96]. Starting from an older test method, CBT (Continuous Bending under Tension), the authors of the paper proposed a method called TCBC (Tension under Cyclic Bending and Compression) for assessing the formability in DSIF.…”

Section: Process Formability Of Aluminium and Aluminium Alloysmentioning

confidence: 99%

Recent Developments and Future Challenges in Incremental Sheet Forming of Aluminium and Aluminium Alloy Sheets

Trzepieciński

Najm

Oleksik

et al. 2022

Metals

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Due to a favourable strength-to-density ratio, aluminium and its alloys are increasingly used in the automotive, aviation and space industries for the fabrication of skins and other structural elements. This article explores the opportunities for and limitations of using Single- and Two Point Incremental Sheet Forming techniques to form sheets from aluminium and its alloys. Incremental Sheet Forming (ISF) methods are designed to increase the efficiency of processing in low- and medium-batch production because (i) it does not require the production of a matrix and (ii) the forming time is much higher than in conventional methods of sheet metal forming. The tool in the form of a rotating mandrel gradually sinks into the sheet, thus leading to an increase in the degree of deformation of the material. This article provides an overview of the published results of research on the influence of the parameters of the ISF process (feed rate, tool rotational speed, step size), tool path strategy, friction conditions and process temperature on the formability and surface quality of the workpieces. This study summarises the latest development trends in experimental research on, and computer simulation using, the finite element method of ISF processes conducted in cold forming conditions and at elevated temperature. Possible directions for further research are also identified.

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Section: Process Formability Of Aluminium and Aluminium Alloysmentioning

confidence: 99%

Recent Developments and Future Challenges in Incremental Sheet Forming of Aluminium and Aluminium Alloy Sheets

Trzepieciński

Najm

Oleksik

et al. 2022

Metals

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“…However, to which degree the material formability could be enhanced and how it differed from the prediction made by the traditional testing methods remained unexplored. Recently, representative ISF tests were developed, including the continuous bending under tension (CBT) test for SPIF [18] and the tension under cyclic bending and compression (TCBC) test for both SPIF and DSIF [19]. In the CBT test, as shown in figure 5, the complicated contact conditions in ISF were simplified into a twodimensional model.…”

Section: Aa7075 Aa1050mentioning

confidence: 99%

Biaxial tension under bending and compression - development of a new formability test for incremental sheet forming

Long

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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A new testing method, Biaxial Tension under Bending and Compression (BTBC), is developed to investigate the effect of different deformation modes on material formability in Incremental Sheet Forming (ISF). A cruciform specimen is designed by simulating the material deformation under biaxial tension using Finite Element (FE) method. In the BTBC experimental testing, the cruciform specimen can be stretched in biaxial directions and the strain ratio of the two perpendicular directions can be varied. Furthermore, the superimposed effect of compression, bending and cyclic loading can be investigated. Material formability of aluminium alloy AA5251-H22 under plane strain path is tested. True strains of the specimen under different deformation modes are obtained by measuring distortions of circular grids inscribed onto the surface of the specimen. The experimental results show that the introduction of bending and compression contributes to localised material deformation. Material formability is improved by the introduction of bending, which is further enhanced by applying compression and cyclic loading. The BTBC test overcomes the limitation of commonly used testing methods in ISF formability studies, providing a fundamental explanation of the effect of strain path and loading conditions on the material deformation and fracture behaviour in ISF.

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“…Study of deformation mechanism in DSIF process [21] reveals that ST mainly provides back pressure support for AA5052 layer. Therefore, at the compressive zone, the back support of ST and effects of stretching-bending [22,23] are dominated along the through-thickness direction. The shearing stress θt  is resolved through the frictional force induced by rigid MT.…”

Section: Dissimilar Sheets Deformation In Current Loading Areamentioning

confidence: 99%

Interfacial quality prediction model for Al/steel sheets during friction stir–assisted double-sided incremental forming with synchronous bonding

Liu

et al. 2021

Int J Adv Manuf Technol

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Investigating formability enhancement in double side incremental forming by developing a new test method of tension under cyclic bending and compression

Abstract: This is a repository copy of Investigating formability enhancement in double side incremental forming by developing a new test method of tension under cyclic bending and compression.

Cited by 15 publications

References 29 publications

Recent Developments and Future Challenges in Incremental Sheet Forming of Aluminium and Aluminium Alloy Sheets

Recent Developments and Future Challenges in Incremental Sheet Forming of Aluminium and Aluminium Alloy Sheets

Biaxial tension under bending and compression - development of a new formability test for incremental sheet forming

Interfacial quality prediction model for Al/steel sheets during friction stir–assisted double-sided incremental forming with synchronous bonding

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