Due to the very large number of tests offered, descriptions of those most commonly requested have been gathered into the following groups:

ASTM E517 – Plastic Strain Ration “r” for Sheet Metal

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ASTM E517 covers special tension testing for the measurement of the plastic strain ratio, r, of sheet metal intended for deep-drawing applications.

The plastic strain ratio r is a parameter that indicates the ability of a sheet metal to resist thinning or thickening when subjected to either tensile or compressive forces in the plane of the sheet. It is a measure of plastic anisotropy and is related to the preferred crystallographic orientations with in a polycrystalline metal. This resistance to thinning or thickening contributes to the forming of shapes, such as cylindrical flat-bottom cups, by the deep-drawing process. The r value, therefore, is considered a measure of sheet metal drawability. It is particularly useful for evaluating materials intended for parts where a substantial portion of the blank must be drawn from beneath the blank holder into the die opening.

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Reference: ASTM E517 – Standard Test Method for Plastic Strain Ration r for Sheet Metal