Full Description

This document specifies the method for measuring the stress-strain curves of sheet metals subject to biaxial tension using a cruciform test piece fabricated from a sheet metal sample. The applicable thickness of the sheet is 0,1mm or more and 0,08times or less of the arm width of the cruciform test piece (see Figure1). The test temperature ranges from 10C to 35C. The amount of plastic strain applicable to the gauge area of the cruciform test piece depends on the force ratio, slit width of the arms, work hardening exponent (n-value) (see AnnexB) and anisotropy of a test material.