Effects of Temperature and Strain Rate on the Forming Limit Curves of AA5086 Sheet

Chu, Xiaodong; Guines, Dominique; Leotoing, Lionel; Ding, Jie; Zhao, Guoqun

doi:10.1016/j.proeng.2014.10.075

Cited by 13 publications

(21 citation statements)

References 13 publications

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“…From a numerical analysis, Takuda et al 8 proposed that high drawability in aluminum alloy is attained by warm forming only in case where sheet is partially cooled. Li and Ghosh 9 conducted research on uniaxial tensile deformation behavior of Al 5182, 5754 and 6111 T4 in 200°C-350°C temperature range and used strain rate ranging between 0.015 and 1.5 s 21 . It was observed that the total elongation increased as the temperature increases and decreased with an increase in strain rate.…”

Section: Introductionmentioning

confidence: 99%

“…Palumbo and Piccininni 20 employed temperature range of 110 °C–220 °C in the warm hydro-forming of AA6061 aluminum alloys. Zhang et al 21 investigated the effects of dynamic forming conditions at elevated temperatures on the FLC using a combination of modified Voce constitutive model with the numerically simulated Marciniak test. Laurent et al 22 reported that formability improves above die temperatures of 150 °C for Al5754.…”

Section: Introductionmentioning

confidence: 99%

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Elevated temperature forming limit strain diagrams of automotive alloys Al6014-T4 and DP600: A case study

Saxena

Drotleff

Mukhopadhyay

2016

The Journal of Strain Analysis for Engineering Design

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The press formability of the automotive materials such as aluminum alloys, magnesium alloys and steels is influenced by forming temperatures. While adjusting the temperature level of die, punch and binder, the lightweight materials can successfully be formed, especially for complex automotive body parts. The objective of this case study is to determine the forming limit curves of Al6014 and DP600 alloy sheet at elevated temperatures in specific range of 200°C and 250°C suitable for press operation in long-run production cycles. The focus is set on Al6014 and DP600 as these two materials are widely used in automotive panels due to their high strength and lightweight and improved resistance to corrosion. DP600 is sometimes preheated before forming to avoid cracks. Thus, it is essential to study the effect of preheating temperature on the formability. Experiments were conducted at forming temperatures of 200°C and 250°C and at low punch speed. The measurement of train distribution was carried out online using digital image correlation with the optical deformation measurement system GOM Aramis. Both Al6014 and DP600 alloys were found to have good drawability and stretchability. It was found that for Al6014, the forming limit curve level increases with temperature. On the contrary, DP600 showed slight decrease in the level of forming limit curve as temperature was increased. Warm formability for these alloys was further characterized through part depth and percentage thinning measurements.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Elevated temperature forming limit strain diagrams of automotive alloys Al6014-T4 and DP600: A case study

Saxena

Drotleff

Mukhopadhyay

2016

The Journal of Strain Analysis for Engineering Design

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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%

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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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Increasing formability in hole-flanging through the use of punch rotation based on temperature and strain rate dependent forming limit curves

2022

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Conventional hole-flanging by stamping is characterized by low formability. It is common knowledge that formability can be improved by forming at high temperatures. High-speed punch rotation is introduced to conventional hole-flanging to use frictional heat to improve and control formability. Thermomechanical finite element (FE) simulations of conventional hole-flanging and hole-flanging with punch rotation are used to determine the effects of punch rotation on the process temperature. Hot tensile tests were conducted to find the effects of temperature and strain rate on the forming limit of the blank. The Marciniak–Kuczynski (M–K) forming limit model is used to estimate temperature and strain-rate dependent forming limits of the material. Hole flanging experiments were conducted at different punch speeds and feeds to determine process windows that maximize formability. A maximum hole expansion ratio (HER) of 4 was obtained in hole-flanging with punch rotation compared to 1.48 in conventional hole-flanging experiments. In theory, a rise in blank temperature to 400 °C in hole-flanging with punch rotation enhances the HER by 30% based on the FE simulations. However, experiments of hole-flanging with punch rotation reveal a 170% increase in formability. The difference in formability between the experiments and FE simulations is attributed to the influence of high-speed deformation, in-plane shear and non-proportional loading paths. To control formability in hole-flanging with high-speed punch rotation, it seems sufficient to establish a closed-loop control of the process with a pre-defined temperature profile.

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Effects of Temperature and Strain Rate on the Forming Limit Curves of AA5086 Sheet

Cited by 13 publications

References 13 publications

Elevated temperature forming limit strain diagrams of automotive alloys Al6014-T4 and DP600: A case study

Elevated temperature forming limit strain diagrams of automotive alloys Al6014-T4 and DP600: A case study

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

Increasing formability in hole-flanging through the use of punch rotation based on temperature and strain rate dependent forming limit curves

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