Bulge Testing under Constant and Variable Strain Rates of Superplastic Aluminium Alloys

Banabic, Dorel; Vulcan, Mihai; Siegert, K.

doi:10.1016/s0007-8506(07)60084-5

Cited by 47 publications

(21 citation statements)

References 9 publications

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“…Though the FLC presented in their work is confined to the right side of an FLD, it shows minimum major strains at the balanced biaxial tension region. The FLC generated by Banabic et al 2005, for the same alloy using the same pneumatic stretching approach at 550°C, shows similar behavior. 24 This trend also agrees with those reported in our previous efforts on the Mg AZ31B and AA5083 at conditions close to those covered herein, except that they are based on the pneumatic stretching test.…”

Section: Materials and Specimen Preparationmentioning

confidence: 73%

“…The FLC generated by Banabic et al 2005, for the same alloy using the same pneumatic stretching approach at 550°C, shows similar behavior. 24 This trend also agrees with those reported in our previous efforts on the Mg AZ31B and AA5083 at conditions close to those covered herein, except that they are based on the pneumatic stretching test. 21 Testing starts by heating the entire Nakazima test assembly to the desired temperature, and allowing it to equilibrate for a sufficient amount of time (no less than an hour).…”

Section: Materials and Specimen Preparationmentioning

confidence: 73%

“…The testing approach, recently referred to as the pneumatic stretching test, 21,22 has been successfully used to construct the FLCs for several alloys, including the AA5083, at temperatures as high as 550°C. [21][22][23][24][25][26][27][28][29] The only drawback though is that FLCs produced by this test are "incomplete", in the sense that they are always confined to the right quadrant of an FLD (negative minor strains are not attainable).…”

Section: Introductionmentioning

confidence: 99%

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The development of a forming limit surface for 5083 aluminum alloy sheet

Abu-Farha

2011

JOM

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How would you……describe the overall significance of this paper? This article addresses the current limitation of forming limit curves in satisfying the needs of warm/hot sheet metal forming operations; particularly the ones carried out at non-isothermal conditions. The concept of a "Forming Limit Surface" is introduced as the means to resolve the latter limitation through a comprehensive map that describes material formability over wide-ranging temperatures.…describe this work to a materials science and engineering professional with no experience in your technical specialty? Formability of a 5083 aluminum alloy sheet is investigated at different temperatures ranging between 250 and 550°C. The results are expressed in the form of a continuous three-dimensional surface: the x-axis represents the biaxial strain ratio, while the y-axis represents the forming temperature; the z-axis provides the maximum strain the material can undergo before failure. …describe this work to a layperson?Testing is performed on a selected aluminum sheet to evaluate its "ability-to-stretch" at different temperatures. The results are presented in a unique way using a 3D plot.A custom mechanical stretching setup based on the Nakazima method was designed and built for testing sheet metals at elevated temperatures. Specimens from a fine-grained 5083 aluminum alloy sheet were deformed at various temperatures, spanning between those associated with warm forming (250°C) and hot forming (550°C). Circle grid analysis of the deformed specimens produced the forming limit curves at each of the covered temperatures, hence revealing the great influences of forming temperature on the material's formability limits. Finally, all the curves were combined to construct a unique three-dimensional forming limit surface, which we present here as a more comprehensive map for describing material formability limits at wide-ranging temperatures.

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Section: Materials and Specimen Preparationmentioning

confidence: 73%

Section: Materials and Specimen Preparationmentioning

confidence: 73%

Section: Introductionmentioning

confidence: 99%

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The development of a forming limit surface for 5083 aluminum alloy sheet

Abu-Farha

2011

JOM

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“…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.…”

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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“…A substantial body of theoretical and experimental literature aimed at understanding material deformation in bulge forming has appeared over the past several decades due in large part to its relative simplicity (e.g. zero or minimal friction, axisymmetric geometry, thin sheet material, gas pressure loading) (Ref [1][2][3][4][5][6][7][8][9][10][11]. Bulge forming is often used to evaluate Al alloy formability, such as AA5083, for use in quickplastic forming (QPF) of complex body closure panels ( Ref 12).…”

Section: Introductionmentioning

confidence: 99%

Simulation of High-Temperature AA5083 Bulge Forming with a Hardening/Softening Material Model

Jarrar

Abu-Farha

Hector

et al. 2009

J. of Materi Eng and Perform

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High-temperature bulge forming of AA5083 aluminum sheet was simulated with the commercial finite element (FE) code ABAQUSä. A material model that is strain rate sensitive and accounts for strain hardening and softening was used. Results were compared with data from AA5083 bulge forming experiments at 450°C where the gas pressure was a prescribed constant value. The results show that the material model is capable of predicting the deformation and thinning behavior at different constant pressure levels. In ancillary simulations, time-varying pressure profiles were computed (rather than prescribed) with an internal ABAQUSä routine that attempts to maintain the strain rate at the bulge dome pole within a specified range. The time-varying profiles, for which no experimental AA5083 bulge forming data exist, can be programmed into existing bulge testing instrumentation to validate the associated predictions of bulge dome height and thinning. The present effort represents a necessary step toward predicting gas pressure profiles by coupling the pressure profile with a desired sheet deformation rate.

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Bulge Testing under Constant and Variable Strain Rates of Superplastic Aluminium Alloys

Cited by 47 publications

References 9 publications

The development of a forming limit surface for 5083 aluminum alloy sheet

The development of a forming limit surface for 5083 aluminum alloy sheet

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

Simulation of High-Temperature AA5083 Bulge Forming with a Hardening/Softening Material Model

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