User`s guide
75
The beverage can lids are usually made from AA5182 H48, while bodies are usually made from AA 3004
or AA 3104 in the H 19 temper. This specification is sufficiently wide to permit suppliers to offer
versions with higher formability or higher strength properties. Increase in material strength has been
achieved by gradually increasing the magnesium content from the nominal 0.9% of 10 years ago, to
nominal 1.1% today, and copper from nominal 0.06 to 0.15%. In addition to magnesium and copper,
manganese (up to 1.5%) is the principal alloying element for increasing strength. Careful control of the
level of iron, and the iron/silicon ratio, assists in reducing the level of earing; it also assists in controlling
the grain size, which is beneficial to formability.
3
b. Material property of soda cans (material type, elastic modulus, and
Poisson’s ratio) and uncertainty associated.
AA3004-H19’s mechanical properties and significant digits of the data are shown in table below.
Mechanical Properties
Metric
English
Value
Significant Digits
Value
Significant Digits
Modulus of Elasticity
69.0 GPa
3
10000ksi
3
Poisson’s Ratio
0.35
2
0.35
2
Table 2 AA3004-H19’s mechanical properties
In Aluminum alloys, the compressive modulus is typically 2% greater than the tensile modulus. Provided
value is an average of modulus of elasticity during tension and compression.
4
Therefore, since strain
gauge is in tension during our experiment, the corrected modulus of elasticity should be 68.3 GPa and
9900ksi, uncertainty of modulus of elasticity should be approximately 1%. And uncertainty of Poisson’
ratio is about 3%.
3
Wootton, E. (n.d.). Case study on Can Making. Retrieved 2012, from Training in Aluminum Application
Technologies: http://core.materials.ac.uk/repository/eaa/talat/3710.pdf
4
Ibid.