48.1 SHEET METAL PROPERTIES
· The properties of sheet metal determine how well it can be stretched or bent.
· The various properties include,
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- Formability - a larger strain rate exponent `n' relates to longer deformation
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- Uniform Necking - the higher the strain rate sensitivity `m', the less localized the necking
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- 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.
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- Anisotropy - if the material properties have no directionality deformation will be even.
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- Small Grains - finer grains are preferred for better metal properties and surface finish.
