This specific tensile testing method conforms to ISO 10113 and can be used to determine the plastic strain ratio of sheet and strip metal products.
A uniaxial tensile load is applied to a rectangular material specimen with a reduced cross-section or to a parallel strip-shaped rectangular specimen, and the changes in its length and width are measured. For most sheet metals, assuming a constant volume, the plastic strain ratio can be calculated as the ratio of the actual plastic width strain to the actual plastic thickness strain (up to the maximum applied load).