A wide variety of products is made from sheet metal using processes such as bending and folding, pressing, deep drawing and spinning. All these processes involve subjecting the material to considerable plastic deformation and the sheet metal must possess sufficient ductility for it to perform well during the forming process. The value of percentage elongation determined in a standard tensile test gives a reasonable indication of ductility but it may not be sufficiently sensitive to indicate the ability of the material to be shaped satisfactorily into a finished article by one of the sheet metal forming processes.
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