GB/T 38684-2020 Metallic materials—Sheet and strip—Biaxial stress-strain curve by means of bulge test—Optical measuring systems

Scope: This standard specifies the symbols and descriptions, principles, test equipment, optical measurement systems, specimens, test procedures, evaluation of vertex curvature deformation and strain for the biaxial stress-strain curve bulging test optical measurement method of metal material sheets and strips Method, calculation of biaxial stress-strain curve and test report. This standard applies to metal sheets and strips with a thickness of less than 3 mm, and their biaxial stress-strain curves are determined during pure bulging. Note: The term "biaxial stress-strain curve" in this standard is an abbreviation. What the test measures is the "biaxial true stress-true strain curve". 2 Symbols and descriptions

2020 GB/T 38684-2020 Metallic materials—Sheet and strip—Biaxial stress-strain curve by means of bulge test—Optical measuring systems

GB/T 38684-2020Metallic materials—Sheet and strip—Biaxial stress-strain curve by means of bulge test—Optical measuring systems