Theoretical and numerical study of strain rate influence on AA5083 formability

Zhang, Cunsheng; Leotoing, Lionel; Guines, Dominique; Ragneau, Eric

doi:10.1016/j.jmatprotec.2008.09.003

Cited by 129 publications

(50 citation statements)

References 19 publications

(19 reference statements)

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“…In recently years, a significant effort has been spent on developing more accurate and reliable analytical and numerical models to construct FLCs (Ref [8][9][10][11][12]. Also, several necking criteria have been proposed to predict the onset of localized necking and construct the FLCs of sheet metals, e.g., BrunÕs criterion (Ref 8), PetekÕs criterion (Ref 9), VolkÕs criterion (Ref 10), etc.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study of Different Necking Criteria for Numerical and Experimental Prediction of FLCs

Leotoing

Zhao

Guines

et al. 2010

J. of Materi Eng and Perform

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For sheet metal forming, the determination of the onset of localized necking directly influences the formability evaluation and construction of forming limit curves (FLCs). Several necking criteria in the literature have been proposed and widely used, however, there are some restrictions, e.g., some criteria are suitable for numerical methods but not for the experimental phase. In this study, numerical and experimental procedures are carried out to seek an appropriate necking criterion for the prediction of FLCs. This article begins with the FE modeling of the Marciniak test with ABAQUS. Based on the FE simulation, different necking criteria (global and local ones) are reviewed and analyzed in detail, and the FLCs for a 5086 aluminum sheet are constructed with these criteria. On the other hand, a quasi-static experimental Marciniak test is carried out to study the formability for this given sheet. With a chosen necking criterion, the limit strains are experimentally determined. The comparison between experimental and numerical results shows that the chosen necking criterion could be effective to numerically and experimentally evaluate the global formability of this aluminum alloy on the wide range of strain states.

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Section: Introductionmentioning

confidence: 99%

A Comparative Study of Different Necking Criteria for Numerical and Experimental Prediction of FLCs

Leotoing

Zhao

Guines

et al. 2010

J. of Materi Eng and Perform

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“…The upper parts of the curve show the areas occurring for the fracture in the sheet material. [11][12][13] Upon evaluating the forming-limit diagram in Figure 11, it is clear that the AA6061-T4 sheet material has higher deformation limits than the AA6019-T4 sheet material, by showing higher elongation behaviour than the latter. Thus, it provides that the forming-limit curve obtained for the AA6061-T4 sheet material was above the AA6019-T4 sheet metal's forming-limit curve.…”

Section: Forming-limit Diagrammentioning

confidence: 99%

“…10,11 The parameters of the deformation, such as the temperature and strain rate, affecting the mechanical properties of materials affect the formability of sheet material and therefore also affect the forming-limit diagrams. In their studies, C. Zang et al 12,13 determined, by analysing the FLDs of AA5086 and AA5083 aluminium alloys at elevated temperatures and at different strain rates, that the ability of formability decreases due to the increase in the strain rate. T. Naka et al 14 in their study looked at the 5083 magnesium-aluminium alloy at different temperatures and strain rates and reported that the strain rates decrease the formability at high temperatures, but a significant effect is not observed at room temperature.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Forming-limit diagrams and strain-rate-dependent mechanical properties of AA6019-T4 and AA6061-T4 aluminium sheet materials

Çavuşoğlu¹,

Leacock²,

Gürün³

2016

Mater. Tehnol.

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The mechanical properties and formability behaviour of sheet materials depend on the deformation conditions. In this study, the variance of AA6019-T4 and AA6061-T6 aluminium sheet materials related to the strain rate of their mechanical properties was studied by applying uniaxial tensile tests on these materials at different semi-static strain rates (0.3 s -1 , 0.03 s -1 , 0.003 s -1 , 0.0003 s -1 , 0.00003 s -1 ). In addition, forming-limit diagrams of these materials were determined by applying Nakajima tests. When the results were analysed, it was found that the strain rate developed some mechanical properties in the AA6019-T4 and AA6061-T4 sheet materials and that the AA6061-T4 sheet material has a higher formability capability in comparison with the AA6019-T4 sheet material. Keywords: FLD, strain rate, aluminium alloy 6061, aluminium alloy 6019Mehanske lastnosti in obna{anje pri preoblikovanju plo~evine sta odvisna od pogojev deformacije. V {tudiji je bilo prou~evano spreminjanje AA6019-T4 in AA6061-T6 aluminijeve plo~evine glede na hitrost preoblikovanja in prou~evane so bile njihove mehanske lastnosti z uporabo enoosnih nateznih preizkusov teh materialov pri razli~nih semi-stati~nih hitrostih preoblikovanja (0.3 s -1 , 0.03 s -1 , 0.003 s -1 , 0.0003 s -1 , 0.00003 s -1 ). Dodatno so bili dolo~eni {e diagrami mejnega preoblikovanja teh materialov z uporabo Nakajima preizkusov. Analiza dobljenih rezultatov je pokazala, da hitrost preoblikovanja vpliva na mehanske lastnosti AA6019-T4 in AA6061-T4 plo~evin in da ima AA6061-T4 plo~evina ve~jo sposobnost preoblikovanja v primerjavi s plo~evino AA6019-T4. Klju~ne besede: FLD, hitrost deformacije, aluminijeva zlitina 6061, aluminijeva zlitina 6019

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“…Different failure criteria have been discussed by Zhang et al [3]. If the necking occurs in a zone, a sharp change of strain can be observed, corresponding to the onset of a plastic instability.…”

Section: Flc Identificationmentioning

confidence: 99%

An in-plane tensile test for rheological and formability identification: comparison between experimental and numerical FLC

Leotoing

Guines

Ragneau

2011

AIP Conference Proceedings

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Abstract. Both accurate constitutive laws and formability limits of materials are essential for a numerical optimization of sheet forming processes. To identify these behaviors, experimental databases are needed. In this work, experiments are performed from a biaxial device able to give for a unique in-plane specimen a good prediction of rheological parameters and formability. The proposed device is a servo-hydraulic testing machine provided with four independent dynamic actuators. By localizing necking in the central zone of the specimen, the strain path in this zone is controlled by the speed ratio between the two axes and the whole forming limit diagram can be covered. The experimental forming limit curve for the aluminium alloy AA5086 is determined thanks to a rigorous procedure for detecting the onset of necking in the specimen. Material parameters (constants of both hardening law and anisotropic yield criterion) are identified from the global measurement of force versus displacement curves by means of an inverse analysis procedure. Comparison between experimental and numerical forming limit curves are presented. For the numerical FLCs, two sets of material parameters are compared, the former is identified through the classical uniaxial test and the latter thanks to the dedicated cruciform specimen.

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Theoretical and numerical study of strain rate influence on AA5083 formability

Cited by 129 publications

References 19 publications

A Comparative Study of Different Necking Criteria for Numerical and Experimental Prediction of FLCs

A Comparative Study of Different Necking Criteria for Numerical and Experimental Prediction of FLCs

Forming-limit diagrams and strain-rate-dependent mechanical properties of AA6019-T4 and AA6061-T4 aluminium sheet materials

An in-plane tensile test for rheological and formability identification: comparison between experimental and numerical FLC

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