• The properties of sheet metal determine how well it can be stretched or bent.
• The various properties include,
- Formability - a larger strain rate exponent ‘n’ relates to longer deformation
- Uniform Necking - the higher the strain rate sensitivity ‘m’, the less localized the necking
- Uniform Elongation - when the yield point has upper and lower points the material may
deform in bands - giving long depressions in work surface called Leuder’s bands.
These may occur in low carbon steels and aluminum/magnesium alloys.
- Anisotropy - if the material properties have no directionality deformation will be even.
- Small Grains - finer grains are preferred for better metal properties and surface finish.
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