Benchmark 3 - Springback of an Al-Mg alloy in warm forming conditions

Manach, Pierre‐Yves; Coër, J.; Laurent, Hervé; Yoon, Jeong Whan

doi:10.1088/1742-6596/734/2/022003

Cited by 12 publications

(28 citation statements)

References 3 publications

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“…It should be mentioned that, globally, the test conditions are identical to the ones adopted in the cylindrical cup proposed as benchmark at conference Numisheet 2016 [34].…”

Section: Methodsmentioning

confidence: 99%

Detailed experimental and numerical analysis of a cylindrical cup deep drawing: Pros and cons of using solid-shell elements

et al. 2017

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The Swift test was originally proposed as a formability test to reproduce the conditions observed in deep drawing operations. This test consists on forming a cylindrical cup from a circular blank, using a flat bottom cylindrical punch and has been extensively studied using both analytical and numerical methods. This test can also be combined with the Demeri test, which consists in cutting a ring from the wall of a cylindrical cup, in order to open it afterwards to measure the springback. This combination allows their use as benchmark test, in order to improve the knowledge concerning the numerical simulation models, through the comparison between experimental and numerical results.The focus of this study is the experimental and numerical analyses of the Swift cup test, followed by the Demeri test, performed with an AA5754-O alloy at room temperature. In this context, a detailed analysis of the punch force evolution, the thickness evolution along the cup wall, the earing profile, the strain paths and their evolution and the ring opening is performed. The numerical simulation is performed using the finite element code ABAQUS, with solid and solid-shell elements, in order to compare the computational efficiency of these type of elements. The results show that the solid-shell 1 Corresponding author: Tel.: +351239790700, Fax: +351239790701. E-mail addresses: jeremy.coer@univ-ubs.fr (J. Coër), herve.laurent@univ-ubs.fr (H. Laurent), marta.oliveira@dem.uc.pt (M.C. Oliveira), pierre-yves.manach@univ-ubs.fr (P.-Y. Manach), luis.menezes@dem.uc.pt (L.F. Menezes) 2 element is more cost-effective than the solid, presenting global accurate predictions, excepted for the thinning zones. Both the von Mises and the Hill48 yield criteria predict the strain distributions in the final cup quite accurately. However, improved knowledge concerning the stress states is still required, because the Hill48 criterion showed difficulties in the correct prediction of the springback, whatever the type of finite element adopted.

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“…It should be mentioned that, globally, the test conditions are identical to the ones adopted in the cylindrical cup proposed as benchmark at conference Numisheet 2016 [34].…”

Section: Methodsmentioning

confidence: 99%

Detailed experimental and numerical analysis of a cylindrical cup deep drawing: Pros and cons of using solid-shell elements

et al. 2017

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“…For this comparison first it is necessary to investigate what possibilities are available in the AutoForm program to introduce and modify material parameters. This question is clearly demonstrated at the NumiSheet 2016 benchmark test where the springback behavior of aluminum alloys were investigated and compared applying various simulation packages [13].…”

Section: Simulation Tasks In the Projectmentioning

confidence: 99%

“…It is possible to define FLC curves for arbitrary temperatures and to input several FLC curves covering the whole temperature range of the given simulation. Applying the Material Generator we created the material files for the AA6082 material on the basis of AA5754_demo_material file created for the Numisheet 2016 Benchmark-3 [13].…”

Section: Forming Limit Curvesmentioning

confidence: 99%

Some recent developments in sheet metal forming for production of lightweight automotive parts

Tisza

Lukács

Kovács

et al. 2017

J. Phys.: Conf. Ser.

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Abstract. Low cost manufacturing in the automotive industry is one of the main targets due to the ever increasing global competition among car manufacturers all over the World. Sheet metal forming is one of the most important key technologies in the automotive industry; therefore the elaboration of new, innovative low cost manufacturing processes is one of the main objectives in sheet metal forming as well. In 2015 with the initiative of the Imperial

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“…The purpose of this study is to analyse numerically the warm forming conditions of the AA5086 alloy using thermo-mechanical finite element analysis. In order to assess the accuracy of the adopted model, the cylindrical cup proposed as benchmark at the conference Numisheet 2016 is the example selected (Manach et al, 2016). Furthermore, the influence of the process temperature conditions on the springback is evaluated through the split-ring test.…”

Section: Introductionmentioning

confidence: 99%

“…The proposed finite element model is presented in Section 4, including the staggered coupling procedure, which is important for modelling of the thermo-mechanical contact conditions. Section 5 comprises the comparison between numerical and experimental results, which were kindly provided by the benchmark committee (Manach et al, 2016). The main conclusions of this study are discussed in Section 6.…”

Section: Introductionmentioning

confidence: 99%

Thermo-mechanical finite element analysis of the AA5086 alloy under warm forming conditions

Neto

Martins

Cunha

et al. 2018

International Journal of Solids and Structures

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Warm forming processes have been successfully applied at laboratory level to overcome some important drawbacks of the Al−Mg alloys, such as poor formability and large springback.However, the numerical simulation of these processes requires the adoption of coupled thermomechanical finite element analysis, using temperature-dependent material models. The numerical description of the thermo-mechanical behaviour can require a large set of experimental tests. These experimental tests should be performed under conditions identical to the ones observed in the forming process. In this study, the warm deep drawing of a cylindrical cup is analysed, including the split-ring test to assess the temperature effect on the springback.Based on the analysis of the forming process conditions, the thermo-mechanical behaviour of the AA5086 aluminium alloy is described by a rate-independent thermo-elasto-plastic material model. The hardening law adopted is temperature-dependent while the yield function is temperature-independent. Nevertheless, the yield criterion parameters are selected based on the temperature of the heated tools. In fact, the model assumes that the temperature of the tools is uniform and constant, adopting a variable interfacial heat transfer coefficient. The accuracy of 2 the proposed finite element model is assessed by comparing numerical and experimental results.The predicted punch force, thickness distribution and earing profile are in very good agreement with the experimental measurements, when the anisotropic behaviour of the blank is accurately described. However, this does not guarantee a correct springback prediction, which is strongly influenced by the elastic properties, namely the Young's modulus.

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Benchmark 3 - Springback of an Al-Mg alloy in warm forming conditions

Cited by 12 publications

References 3 publications

Detailed experimental and numerical analysis of a cylindrical cup deep drawing: Pros and cons of using solid-shell elements

Detailed experimental and numerical analysis of a cylindrical cup deep drawing: Pros and cons of using solid-shell elements

Some recent developments in sheet metal forming for production of lightweight automotive parts

Thermo-mechanical finite element analysis of the AA5086 alloy under warm forming conditions

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