Influence of Different Strain Rates on the Flow Curve and the Formability of Thin Aluminium and Tinplate Sheets

Abstract

Due to this high number of produced units and the very thin sheet metals used for beverage cans, precise production processes with high production volumes are necessary. To save expenses, while optimising these processes, numerical simulation methods are exploited. Considering this, it is indispensable to identify the material behaviour as exactly as possible. In practise, often results of quasi static tensile tests are used, although these are insufficient for the precise modelling of the material behaviour during can production, since strain rates of up to 10³ s-1 can occur, here. Therefore, quasi static and high speed tensile test have been done on specimens featuring the typical materials and thicknesses of semi-finished parts used for beverage can production. The results were compared with similar materials at higher sheet metal thicknesses and authenticated by numerical simulation. It was shown that there is an influence of the strain rate on the material behaviour and it is necessary to determine material characteristics at strain rates, which are close to the process speed. Furthermore, the results were classified in their signification for beverage can production and forming technologies in general.

Full text

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Influence of Different Strain Rates on the Flow
Curve and the Formability of Thin Aluminium and
Tinplate Sheets
M. Linnemann*, T. Lieber, C. Scheffler, V. Psyk, R. Müller,
D. Landgrebe
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Abstract
Due to this high number of produced units and the very thin sheet metals used for beverage
cans, precise production processes with high production volumes are necessary. To save
expenses, while optimising these processes, numerical simulation methods are exploited.
Considering this, it is indispensable to identify the material behaviour as exactly as possible.
In practise, often results of quasi static tensile tests are used, although these are insufficient
for the precise modelling of the material behaviour during can production, since strain rates
of up to 10³ s-1 can occur, here. Therefore, quasi static and high speed tensile test have been
done on specimens featuring the typical materials and thicknesses of semi-finished parts
used for beverage can production. The results were compared with similar materials at
higher sheet metal thicknesses and authenticated by numerical simulation. It was shown that
there is an influence of the strain rate on the material behaviour and it is necessary to
determine material characteristics at strain rates, which are close to the process speed.
Furthermore, the results were classified in their signification for beverage can production
and forming technologies in general.
Keywords
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1 Introduction
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4 Results and Discussion
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RS XOWLPDWH WHQVLOH VWUHQJWKRP DQGHORQJDWLRQ DW IUDFWXUHA VHH Table 1 DQG IORZ
FXUYHVVHHFigure 3
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material thickness
[mm]
quasi static high speed
Rp0,2 Rm A20 Rp0,2 Rm A20
in N/mm² in % in N/mm² in
%
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7%$       
7%$       
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(1$:       
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Table 1: Material characteristics (1: beverage can materials, 2: comparative materials)
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Figure 3: Flow curves (from onset of yielding to begin of necking)
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Figure 4: Damage evolution curve and model for material T52BA
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Figure 5: Plastic strain and temperature distribution right before crack propagation
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Figure 6: Left: plastic strain and temperature evolution for a point in the localisation
zone. Right: Strain rate distribution with distinct shear bands before failure.
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6 Conclusion
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References
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