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See Chinese contents: GB/T 38684-2020 GB/T 38684-2020: Metallic materials -- Sheet and strip -- Biaxial stress-strain curve by means of bulge test -- Optical measuring systems
This standard specifies the symbols and descriptions, principles, test equipment, optical measurement systems, specimens, test procedures, apex curvature deformation and strain evaluation method for the optical measurement method for the biaxial stress-strain curve bulging test of sheet and strips of metallic materials, as well as the calculation and test report of biaxial stress-strain curve. This standard applies to the determination of biaxial stress-strain curve of the metallic sheet and strip which has a thickness of less than 3 mm during the pure bulging process.
