Simulation of springback

Li, K.P.; Carden, W.P.; Wagoner, R. H.

doi:10.1016/s0020-7403(01)00083-2

Cited by 278 publications

(183 citation statements)

References 45 publications

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“…The blank is meshed with two layers of elements through thickness, leading to four through-thickness integration points. The average in-plane element size (turning angle \ 10°of die radius) guarantee accurate results with the solid element for the forming phase (Li et al 2002). Since the selected geometry presents small springback values, the two layers of elements lead to accurate results (Oliveira et al 2008).…”

Section: Rectangular Cup Examplementioning

confidence: 98%

A deformation based blank design method for formed parts

Hammami

Padmanabhan

Oliveira

et al. 2009

Int J Mech Mater Des

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Blank design is an important task in sheet metal forming process optimization. The initial blank shape has direct effect on the part quality. This paper presents a deformation based blank design approach to determine the initial blank shape for a formed part. The blank design approach is integrated separately into ABAQUS, and DD3IMP, a research purpose in-house FEA code, to demonstrate its compatibility with any FEA code. The algorithm uses FE results to optimize the blank shape for a part. Deep drawing simulation of a rectangular cup geometry was carried out with an initial blank shape determined empirically. The blank shape was iteratively modified, based on the deformation history, until an optimal blank shape for the part is achieved. The optimal blank shapes predicted by the algorithm using both FEA softwares were similar. Marginal differences in the shape error indicate that the deformation history based push/pull technique can effectively determine an optimal blank shape for a part with any FEA software. For the shape error selected, both procedures estimate the optimal blank shape for the part within five iterations.

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Section: Rectangular Cup Examplementioning

confidence: 98%

A deformation based blank design method for formed parts

Hammami

Padmanabhan

Oliveira

et al. 2009

Int J Mech Mater Des

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“…As springback can produce unexpected geometric errors, it can cause difficulties when assembling deformed parts. Therefore, a large amount of research has been conducted on springback prediction and compensation in terms of experiments and simulations [7][8][9][10]. These valuablevalued achievements have helped people obtain a better understanding of this unique phenomenon.…”

Section: Introductionmentioning

confidence: 99%

Effect of Grain Size on Springback and System Energy in Micro V-Bending with Phosphor Bronze Foil

Fang

Jiang

Wang

et al. 2015

Metall Mater Trans A

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In this paper, the effect of grain size on springback in the micro V-bending process of phosphor bronze foil (face-centered cubic structure) is investigated. Grain size effect is expressed by the ratio of material thickness (T) to average grain size (D), and these T/D values are divided into three groups: larger than 1, less than 1, and approximately equal to 1. It has been found that springback angles were the lowest when T/D ≈ 1. Electron backscattering diffraction (EBSD) measurement results show that the twinning boundaries change with the ratios of T/D before and after bending. When T/D > 1, the high relative frequency of Σ3 implies that the specimen has a high system energy, which can result in large springback behavior. The equal relative frequencies of Σ3 for specimens with three ratios also prove that twinning boundaries can be regarded as an indicator of system energy. The effect of grain size on grain reorientation during bending is also discussed, and it was found that the least quantities of high surface energy {110} planes in the T/D ≈ 1 material could contribute to the least springback angles. the high relative frequency of Σ3 implies that the system specimen has a high system energy, which can result in large springback behaviour. The equal relative frequencies of Σ3 after bending for three ratios' specimens also prove that twinning boundaries can be regarded as an indicator of system energy. Moreover, the effect of grain size on grain reorientation during bending was discussed, and the least quantities of high surface energy {110} planes in the T/D≈1 material could contribute to the least springback angles.

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“…Papeleux and Ponthot (2002) investigated the effect on springback from e.g., blank holder force, the coefficient of friction, and the choice of time discretisation in the solution process. Li et al (2002) studied how element formulation, the number of through-thickness integration points, and tool radius versus blank thickness affected the springback. Wagoner and Li (2007) studied the role of the number of through-thickness integration points by comparing the analytical and numerical integration of bending moments in the bending-under-tension of a beam.…”

Section: Introductionmentioning

confidence: 99%

Finite element simulation of the manufacturing process chain of a sheet metal assembly

Govik¹,

Nilsson²,

Moshfegh³

2012

Journal of Materials Processing Technology

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An increasing number of components in automotive structures are today made from advanced high strength steel (AHSS). Since AHSS demonstrates more severe springback behaviour than ordinary mild steels, it requires more efforts to meet the design specification of the stamped parts. Consequently, the physical fine tuning of the die design and the stamping process can be time consuming. The trial-and-error development process may be shortened by replacing most of the physical try-outs with finite e lement (FE) simulations of the forming process, including the springback behaviour. Still it can be hard to identify when a stamped part will lead to an acceptable assembly with respect to the geometry and the residual stress state. In part since the assembling process itself will distort the components. To resolve this matter it is here proposed to extend the FE-simulation of the stamping process, to also include the first level sub-assembly stage. In this study a methodology of sequentially simulating each step in the manufacturing process of an assembly is proposed. Each step of the proposed methodology is described, and a validation of the prediction capabilities is performed by comparing with a physically manufactured assembly. The assembly is composed of three sheet metal components made from DP600 steel which are joined by spot welding. The components are designed to exhibit severe springback behaviour in order to put both the forming and subsequent assembling simulations to the test. The work presented here demonstrates that by using virtual prototyping it is possible to predict the final shape of an assembled structure.

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Simulation of springback

Cited by 278 publications

References 45 publications

A deformation based blank design method for formed parts

A deformation based blank design method for formed parts

Effect of Grain Size on Springback and System Energy in Micro V-Bending with Phosphor Bronze Foil

Finite element simulation of the manufacturing process chain of a sheet metal assembly

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