Evaluation of springback under the effect of holding force and die radius in a stretch bending test

Ouakdi, E. H.; Louahdi, R.; Khirani, D.; Tabourot, Laurent

doi:10.1016/j.matdes.2011.09.003

Cited by 43 publications

(29 citation statements)

References 31 publications

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“…Previous works have confirmed the U-bending test to be a significant verification model for springback prediction [21][22][23]. The tools used in U-bending are shown in Figure 6, consisting of a punch, blank holder, and die.…”

Section: U-bending Testmentioning

confidence: 94%

Effect of Constitutive Equations on Springback Prediction Accuracy in the TRIP1180 Cold Stamping

Seo

Kim

Lee³

et al. 2017

Metals

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Abstract:This study aimed to evaluate the effect of constitutive equations on springback prediction accuracy in cold stamping with various deformation modes. This study investigated the ability of two yield functions to describe the yield behavior: Hill'48 and Yld2000-2d. Isotropic and kinematic hardening models based on the Yoshida-Uemori model were adopted to describe the hardening behavior. The chord modulus model was used to calculate the degradation of the elastic modulus that occurred during plastic loading. Various material tests (such as uniaxial tension, tension-compression, loading-unloading, and hydraulic bulging tests) were conducted to determine the material parameters of the models. The parameters thus obtained were implemented in a springback prediction finite element (FE) simulation, and the results were compared to experimental data. The springback prediction accuracy was evaluated using U-bending and T-shape drawing. The constitutive equations wielded significant influence over the springback prediction accuracy. This demonstrates the importance of selecting appropriate constitutive equations that accurately describe the material behaviors in FE simulations.

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Section: U-bending Testmentioning

confidence: 94%

Effect of Constitutive Equations on Springback Prediction Accuracy in the TRIP1180 Cold Stamping

Seo

Kim

Lee³

et al. 2017

Metals

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“…The sheet metals with high strength always show greater springback in comparison to mild sheet metals. Also, the springback angle increases with increasing strength, yield stress and strain hardening [15][16][17] . In the scope of this study, the effects of yield stress and the hardness properties of the test materials on springback were considered.…”

Section: Effects Of Materials Properties On Springbackmentioning

confidence: 98%

“…A fuzzy logic system commonly used in various disciplines was used in this study to estimate springback angles with respect to unexecuted break-test parameters. The first step in defining the fuzzy system, forming pressure (10, 12, and 14.4 MPa), die angle (15,30,45,75, and 90 degree) and holding time (0, 5, and 10 seconds) were defined as the input variables, while springback was defined as the output variable. During the step for definition of variables, minimum and maximum values of each variable, and the number of variables were defined for the fuzzy system.…”

mentioning

confidence: 99%

The Evaluation of Process Parameters on Springback in V-bending Using the Flexforming Process

Karaağaç

2017

Mat. Res.

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One of the most significant problems in bending sheet metals is the springback behavior caused by the elastic stress formed after the bending process. In this study, the effects of forming pressure, die angle and holding time on the springback behavior were experimentally investigated for V-bending using the flexforming process. Furthermore, springback behavior was predicted using a fuzzy logic system based on unexecuted break-test parameters. The study was carried out using a thin rubber membrane instead of the thick ones normally used in flexforming processes. During the flexforming process, it was observed that springback were 60.57% and 41.92% less than those formed by a conventional die for AL1050-0 and AL5754-0 sheet metal materials, respectively. It was determined that an increase of 15 degree in the die angle increased springback values on average by 0.12 degree and 0.23 degree for AL1050-0 and AL5754-0, respectively. It was also found that an increase of 10 seconds in the holding time decreased springback values on average by 0.14 degree and 0.19 degree for AL1050-0 and AL5754-0, respectively. It was determined that there were no forming defects on the surfaces of the parts bent through the flexforming process.

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“…In flanging processes, springback values were estimated with different die radiuses and die drops [27,28]. Moreover, in draw bending processes, the effects of die radius and waiting time of punch on the amounts of spring-back were also among the examined subjects [29]. Researchers have obtained spring-back values in free bending processes at different radius and 0 angles and compared them to each other by modelling a number of artificial neural networks [30].…”

Section: Introductionmentioning

confidence: 99%

Microstructural Characterization and Deformation of X10CrAlSi24 Sheet Material Applied V-Bending Process

Özdemir

Gökmeşe

2018

Teh. vjesn.

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This study used X10CrAlSi24 (1.4762) sheet material, which is widespread in bending processes of the energy sector. During bending of X10CrAlSi24 (1.4762) sheet materials, cracking and tearing occur due to these materials' brittleness at room temperatures. To avoid this phenomenon, bending was carried out by applying normalization treatments at 800 ºC, 850 ºC, 900 ºC and 950 ºC. V-bending processes were performed at three different bending angles (30º, 60º, 90º) and by a 4.5 mm punch tip radius. V-bending processes were carried out without leaving the punch on the material, and crushing of the punch on the sheet material sectional area was allowed. As a result of the bending processes, spring-go occurred in the 30º and 60º bending applications, whereas spring-back occurred in the 90º bending applications. The formation mechanism of capillary cracks (depending on deformation) due to internal stress especially at low temperatures was introduced by the microstructural characterization of the specimens.

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Evaluation of springback under the effect of holding force and die radius in a stretch bending test

Cited by 43 publications

References 31 publications

Effect of Constitutive Equations on Springback Prediction Accuracy in the TRIP1180 Cold Stamping

Effect of Constitutive Equations on Springback Prediction Accuracy in the TRIP1180 Cold Stamping

The Evaluation of Process Parameters on Springback in V-bending Using the Flexforming Process

Microstructural Characterization and Deformation of X10CrAlSi24 Sheet Material Applied V-Bending Process

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