ASTM E 517 – 00 Plastic Strain Ratio r for Sheet Metal

ASTM E 517 – 00 Plastic Strain Ratio r for Sheet Metal

ASTM E 517 – 00 applies to specific stress testing of sheet metal designed for deep-drawing applications to determine the plastic strain ratio, r. The values are considered as a standard when expressed in SI units.

    Scope:

    When sheet metal is exposed to either tensile or compressive stresses in the plane of the sheet, the plastic strain ratio r is a parameter that reflects its capacity to resist thinning or thickening. The r-value is used to determine the drawability of sheet metal. It’s especially useful for assessing materials for parts where a large piece of the blank must be brought into the die hole from beneath the blank holder.

    Procedure:

    The plastic strain ratio r is calculated from changes in width and thickness caused by plastic deformation, given that these changes are recorded accurately in a stress test. Extensometers were attached to the specimen to quantify longitudinal and transverse strain. The extensometers’ gauge length was recorded. The specimen was axially pulled. When the specimen was stretched beyond yield-point elongation but has not surpassed the strain at maximum applied force, the data produced by the extensometers were used to determine the change in width corresponding to a change in length. 

    Specimen:

    Each specimen’s measurements must be measured for thickness and breadth uniformity in the gauge section.

    Data:

    r is calculated as follows:
    r = ɛw/ɛt
    ɛw = ln(wf /w0) and
    ɛt = ln(t f/t0)

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