An investigation on springback/negative springback phenomena using finite element method and experimental approach

Rahmani, B.; Alinejad, G; Bakhshi-Jooybari, Mohammad; Gorji, Hamid

doi:10.1243/09544054jem1321

Cited by 24 publications

(21 citation statements)

References 13 publications

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“…The measured radius is the final radius after the springback. The springback in sheet metal forming has already been investigated in several studies including references [20], [22], and [23]. It can be estimated from [20,22] …”

Section: Methodsmentioning

confidence: 99%

Analysis of the elastic and plastic roll bending of sheet metal on a rubber pad

Mehrara

Nategh

2011

Proceedings of the Institution of Mechanical Engineers, Part B:

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The roll bending of sheet metals which rest on a rubber pad has only recently been studied scientifically and is dealt with in the present work. In this process, three different zones can be distinguished along the sheet metal profile, including the undeformed zone, the elastic zone, and the plastic zone. The governing differential equations of the deformation zones were investigated for the elastic and plastic bending of the sheet. The equations were solved analytically for elastic bending and analytically-numerically for plastic bending. The effects of the process parameters were then investigated. The elastic-plastic bending solution was verified by experiments.

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Section: Methodsmentioning

confidence: 99%

Analysis of the elastic and plastic roll bending of sheet metal on a rubber pad

Mehrara

Nategh

2011

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…If R tj and R cj , as shown in Figure 4, are the radii in which the jth layer yields in tensile and compressive stresses, respectively, they can be calculated using equations (12) and (13) …”

Section: Primary Bending Theorymentioning

confidence: 99%

“…They studied the effect of punch radius, sheet thickness and sheet orientation corresponding to the rolling direction on the springback and spring forward in V-bending process. 12 Mori et al investigated the springback of the ultra light steel in V-die bending controlled with a computer numerical control (CNC) servo press. The effect of the final sheet reduction in bottoming, forming speed and holding time at the end of the forming was investigated.…”

Section: Introductionmentioning

confidence: 99%

Thickness change and springback of cold roll bonded aluminum/copper clad sheets in air bending process

Parsa

Mohammadi

Mohseni

2016

Proceedings of the Institution of Mechanical Engineers, Part B:

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In this article, an advanced analytical formulation is developed to predict thickness change of an aluminum/copper clad sheet. Springback analytical formulation is also introduced using the combination of advanced and primary bending theories in air bending process. Experiments were performed to verify analytical results and to investigate the effect of different geometrical parameters such as punch stroke, die opening, punch radius and setting condition on the springback. It was observed that die opening had the most striking effect, while setting condition had a negligible effect on springback. On the other hand, setting condition played a crucial role on thickness change in bent clad sheets. Clad sheet thickened in the Al/Cu setting condition, while in the Cu/Al setting it thinned. Finite element method simulation was also applied to verify analytical predictions of the thickness change and study stress distribution in the layers of the clad sheet. Good correlation was observed between analytical and numerical results.

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“…Behrouzi et al 11 applied bending theory in an inverse algorithm for springback compensation in V-bending of sheets. Rahmani et al 12 examined effects of sheet thickness and bending orientation with respect to the rolling direction (RD) on springback in V-bending of steel sheets. It was shown that by increasing bending orientation, yield strength and springback increased.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigations on springback in V-bending of tailor-welded blanks of interstitial free steel

Gautam

Kumar

2017

Proceedings of the Institution of Mechanical Engineers, Part B:

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Tailor-welded blanks of interstitial free steel are commonly used in complex automotive skin panels. The presence of weld zone, difference in thickness and high anisotropic behaviour affect forming behaviour of tailor-welded blanks significantly. Therefore, incorporation of anisotropy of the sheets and properties of the weld zone in finite element simulations is very important for accurate prediction of springback in bending of tailor-welded blanks. In this study, experimental and finite element simulations of V-bending were carried out on tailor-welded blanks of three thickness combinations, prepared by Nd-YAG laser welding of interstitial free steel sheets of thicknesses 0.8, 1.2 and 1.5 mm. The orientation of the weld line in longitudinally welded blanks was kept at 0°, 45°and 90°with respect to the rolling direction to study the effects of anisotropy on springback in V-bending. The tensile properties of the weld zone in different thickness combinations were determined and incorporated in finite element simulations for prediction of springback. It was observed that springback results were mainly governed by the springback behaviour of the thicker sheet in a particular thickness combination. Weld zone properties affect the springback of tailor-welded blanks more significantly than the anisotropy of the sheets. Accuracy of predicted values of springback in simulations increased when the properties of the weld zone were incorporated in the material model.

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An investigation on springback/negative springback phenomena using finite element method and experimental approach

Cited by 24 publications

References 13 publications

Analysis of the elastic and plastic roll bending of sheet metal on a rubber pad

Analysis of the elastic and plastic roll bending of sheet metal on a rubber pad

Thickness change and springback of cold roll bonded aluminum/copper clad sheets in air bending process

Experimental and numerical investigations on springback in V-bending of tailor-welded blanks of interstitial free steel

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