Accurate stress computation in plane strain tensile tests for sheet metal using experimental data

Flores, Paulo; Tuninetti, Víctor; Gilles, Gaëtan; Gonry, Pierre; Duchêne, Laurent; Habraken, Anne Marie

doi:10.1016/j.jmatprotec.2010.06.008

Cited by 49 publications

(29 citation statements)

References 13 publications

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“…Two 3D-DIC systems are used for strain/displacement measurements. The true stress for plane strain tests is computed with the method proposed by Flores et al (2010). This new accurate computational method uses the experimental data while including the edge effect evolution as a function of plastic strain.…”

Section: Simple Shear Bauschinger and Plane Strain Testsmentioning

confidence: 99%

Anisotropy and tension–compression asymmetry modeling of the room temperature plastic response of Ti–6Al–4V

Tuninetti

Gilles

Milis

et al. 2015

International Journal of Plasticity

107

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Section: Simple Shear Bauschinger and Plane Strain Testsmentioning

confidence: 99%

Anisotropy and tension–compression asymmetry modeling of the room temperature plastic response of Ti–6Al–4V

Tuninetti

Gilles

Milis

et al. 2015

International Journal of Plasticity

107

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“…Due to the large amount of anisotropy parameters involved in the definition of this advanced yield criterion (Cazacu&Barlat 2001), the parameter identification procedure becomes complex [35]. In the present study it was performed using the in-house code DD3MAT [36] specifically developed for this purpose, which is based on the minimization of an error function that evaluates the difference between the estimated values and the experimental ones.…”

Section: Materials Constitutive Behaviourmentioning

confidence: 99%

Numerical and experimental analysis of wrinkling during the cup drawing of an AA5042 aluminium alloy

et al. 2015

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The recent trend to reduce the thickness of metallic sheets used in forming processes strongly increases the likelihood of the occurrence of wrinkling. Thus, in order to obtain defect-free components, the prediction of this kind of defect becomes extremely important in the tool design and selection of process parameters. In this study, the sheet metal forming process proposed as a benchmark in the Numisheet 2014 conference is selected to analyse the influence of the tool geometry on wrinkling behaviour, as well as the reliability of the developed numerical model. The side-wall wrinkling during the deep drawing process of a cylindrical cup in AA5042 aluminium alloy is investigated through finite element simulation and experimental measurements. The material plastic anisotropy is modelled with an advanced yield criterion beyond the isotropic (von Mises) material behaviour. The results show that the shape of the wrinkles predicted by the numerical model is strongly affected by the finite element mesh used in the blank discretization. The accurate modelling of the plastic anisotropy of the aluminium alloy yields numerical results that are in good agreement with the experiments, particularly the shape and location of the wrinkles. The predicted punch force evolution is strongly influenced by the friction coefficient used in the model. Moreover, the two punch geometries provide drawn cups with different wrinkle waves, mainly differing in amplitude.

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“…The testing geometry is a 60-mm wide tensile specimen, with 15-mm notches on both sides. The stress calculation for notched tensile specimen is done according to Flores et al [5] …”

Section: Process Validation With Notched Tensile Testsmentioning

confidence: 99%

“…The testing geometry is a 60-mm wide tensile specimen, with 15-mm notches on both sides. The stress calculation for notched tensile specimen is done according to Flores et al [5] with a maximum allowable perpendicular strain of 2.0%. The parameter α, for the homogeneous length, was set to α = 0.98.…”

Section: Process Validation With Notched Tensile Testsmentioning

confidence: 99%

“…The determination of the resulting stress components out of the strain data is not possible in the case of notched tensile tests, since the force measurement in the transverse direction, which means ε 2 = 0 is not possible. Flores et al [5] and Wagoner [6] came up against this challenge by defining a dependence of the two principal stresses with the material anisotropy that is quantified in uniaxial tensile tests. Wagoner referred to the mean vertical anisotropy which can be ascribed to the theory of Hill [4] with a factor m = 2.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Improvement of Numerical Modelling Considering Plane Strain Material Characterization with an Elliptic Hydraulic Bulge Test

Lenzen¹,

Merklein²

2018

JMMP

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A precise characterization of material behavior is necessary to identify yield criteria or hardening laws for an accurate numerical design of sheet metal forming processes. Current models like Yld2000-2d or Hill'48 do not consider the plane strain state, though this condition is primary cause of failure in deep drawing. It is anticipated that an improved yield locus contour which considers the stress under plane strain conditions leads to better results in numerical simulations of a deep drawing process. Within this contribution, a new experimental setup to characterize both principal stress components under plane strain as additional input data for material modelling is presented. Therefore, hydraulic bulge tests are carried out with a novel elliptical die, which implements a plane strain condition. Moreover, the improvement of the material model is investigated exemplarily for the three sheet metal alloys DC06, DP600 and AA5182. The resulting material parameters are used to identify the yield locus for plane strain by varying the yield locus exponent of Yld2000-2d. The results prove that considering plane strain yield locus results in a better sheet thickness distribution in comparison to conventional modelling of the deep drawing process.

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Accurate stress computation in plane strain tensile tests for sheet metal using experimental data

Cited by 49 publications

References 13 publications

Anisotropy and tension–compression asymmetry modeling of the room temperature plastic response of Ti–6Al–4V

Anisotropy and tension–compression asymmetry modeling of the room temperature plastic response of Ti–6Al–4V

Numerical and experimental analysis of wrinkling during the cup drawing of an AA5042 aluminium alloy

Improvement of Numerical Modelling Considering Plane Strain Material Characterization with an Elliptic Hydraulic Bulge Test

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