Anisotropy and formability of AA5182-0 aluminium alloy sheets

Banabic, Dorel; Siegert, K.

doi:10.1016/s0007-8506(07)60683-0

Cited by 28 publications

(18 citation statements)

References 8 publications

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“…The main drawback of the cruciform specimen shape is the localization of the deformation between two adjacent arms leading to small levels of strain in the central area at rupture. The existing shapes can be classified into two main types: (i) the cut type with radius or notches between two adjacent arms [10,36,37] and possibly with slots in the arms to reduce the strain localization at the corner of the two arms without reduction of the thickness. This type of cruciform specimen shape is the easiest one to manufacture and is usually chosen to characterize elastic properties or initial yield contours where low strain levels are required; (ii) the second type is the reduced section type where the thickness sheet is reduced in the central part of the specimen in order to ensure a localization of the deformation in this zone.…”

Section: Cruciform Specimenmentioning

confidence: 99%

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Potential of the Cross Biaxial Test for Anisotropy Characterization Based on Heterogeneous Strain Field

Zhang¹,

Leotoing²,

Guines³

et al. 2015

Exp Mech

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Section: Cruciform Specimenmentioning

confidence: 99%

“…It should also be emphasized that the choice of the geometry depends on the application, like measure of elasto-plastic yield stresses under different strain states [9,10,[36][37][38][39] within a limited strain range or characterization of forming limit curves up to very high strains [40].…”

Section: Introductionmentioning

confidence: 99%

Potential of the Cross Biaxial Test for Anisotropy Characterization Based on Heterogeneous Strain Field

Zhang¹,

Leotoing²,

Guines³

et al. 2015

Exp Mech

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“…The most commonly used tests for the determination of the biaxial yield stress are the biaxial tensile test of cruciform specimens [1][2][3][4] and the hydraulic bulge test. A review of biaxial tensile tests using cruciform specimens is presented in the papers [5,6].…”

Section: Introductionmentioning

confidence: 99%

Determination of Material Parameters of Sheet Metals Using the Hydraulic Bulge Test

Lăzărescu

Nicodim²,

Ciobanu³

et al. 2013

Acta Metall Slovaca

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Hydraulic bulging experiments are performed in order to evaluate the mechanical parameters of cold rolled steel (DC04) and aluminium alloy (EN AW 6016-T4) sheet materials. The biaxial yield stresses, and the biaxial anisotropy coefficients are derived from the biaxial stress-strain curves and the ratio between the strains in the transverse and in the rolling direction, respectively. The mechanical parameters resulted from the bulge test in combination with the results from the tensile tests are used to determine the yield loci of the two materials. The effect of the number of input parameters on the capability of the BBC 2008 yield criterion to predict the yield locus is also discussed in the paper. Keywords: hydraulic bulge test, mechanical properties, yield surface IntroductionThe most commonly used tests for the determination of the biaxial yield stress are the biaxial tensile test of cruciform specimens [1][2][3][4] and the hydraulic bulge test. A review of biaxial tensile tests using cruciform specimens is presented in the papers [5,6]. The disadvantages of this method are the complicated geometry of specimens as well as the complexity and high cost of the equipment. An alternative to this test is the hydraulic test. The most important advantage of the hydraulic bulge test is the absence of the contact (and therefore of the frictional interactions) between tools and specimen in the area of interest, which simplifies the analytical solutions for the calculation of stress and strain, but also ensures the repeatability of the test. The hydraulic bulge test is the subject of many scientific papers and has been investigated by other authors such as Hill [7], who developed analytical models for the calculation of polar thickness and curvature radius. He neglected the influence of the fillet radii of the die. The accuracy of the formulas proposed by Hill has been improved by Chakrabarty [8] by taking into account the hardening effects. Furthermore, Shang [9] extended the formulas proposed by Hill in order to take into account the fillet radius of the die insert. Atkinson [10] also tried to improve the accuracy of the analytical predictions referring to the polar thickness and dome radius. Kruglov [11] developed a formula for the calculation of the polar strains. Banabic [12] developed analytical models for the computation of the pressure-time relationship for the bulging of both strain hardening and superplastic materials trough elliptical dies and Vulcan [13] and Banabic [14] for superplastic forming of aluminium sheets for the cone-cup test. Lăzărescu [15][16][17] developed analytical models for the determination of stress-strain curves using dies with circular and elliptical apertures. Koç [18] performed experimental studies for the

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“…According to [6], this material is often used for manufacturing the outer panels of the car body, while for the inner panels AA5182-0 aluminium alloy is used. A study regarding to anizotropy and formability of this material is presented in [7]. The investigation starts by performing tensile tests in order to determine the uniaxial parameters and the coefficients of Hollomon's hardening law.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the Plastic Behaviour of AA6016-T4 Aluminium Alloy

Paraianu

Banabic

2013

AEF

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Abstract. The current trend in the automotive industry consists in decreasing the weight of the car body to reduce the fuel consumption and the air pollution. This can be done by using low-density materials such as the aluminium alloys having good formability. A frequently used aluminium alloy in the manufacturing of the car body components is AA6016-T4. The paper presents a full mechanical characterization of this material with 1 mm thickness. The investigation starts by performing tensile tests on specimens cut at 0 o , 45 o and 90 o from the rolling direction. For each direction, the yield stress and the anisotropy coefficients are determined. The mechanical parameters of the Hollomon hardening law are determined using the experimental data obtained on samples cut along the rolling direction. Besides the uniaxial parameters, the equibiaxial yield stress and the equibiaxial coefficient of anisotropy are determined by performing bulge tests and compression tests, respectively. The yield surface is characterized in the first quadrant not only by the uniaxial and equibiaxial yield stresses but also by the yield stresses associated to the plane strain status. An experimental strategy for determining the plane strain parameters based on bulge tests is described in the paper. The characterization of the AA6016-T4 aluminium alloy ends with the determination of the forming limit diagram. The tests used for determining the limit strains are the punch stretching and hydraulic bulging.

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Anisotropy and formability of AA5182-0 aluminium alloy sheets

Cited by 28 publications

References 8 publications

Potential of the Cross Biaxial Test for Anisotropy Characterization Based on Heterogeneous Strain Field

Potential of the Cross Biaxial Test for Anisotropy Characterization Based on Heterogeneous Strain Field

Determination of Material Parameters of Sheet Metals Using the Hydraulic Bulge Test

Characterization of the Plastic Behaviour of AA6016-T4 Aluminium Alloy

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