GB/T 5028-2008 (English Version)

Standard No.: GB/T 5028-2008
Language: Chinese, Available in English version
Release Date: 2008
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest: GB/T 5028-2008
Replace: GB/T 5028-1999

Scope: This standard specifies the method for the determination of the tensile strain hardening exponent (n value) of metal sheets and strips. This method is only applicable to the part of the stress-strain curve showing a monotonous continuous rise within the range of plastic deformation (see 7.4). If the stress-strain curve of the material in the work hardening stage is jagged (such as the Portevin-Le Chatelier zigzag yield effect exhibited by some AlMg gold bearings), automatic measurement should be used in order to give a certain reproducibility of the results method (linear regression on the logarithm of true stress - true plastic strain, see 7.7).

GB/T 5028-2008 Referenced Document

GB/T 12160 Metallic materials－Calibration of extensometers systems used in uniaxial testing*， 2019-10-18 Update
GB/T 16825.1 Metallic materials—Calibration and verification of static uniaxial testing machines—Part1:Tension/compression testing machines—Calibration and verification of the force-measuring system*， 2022-10-14 Update
GB/T 228 Metallic materials--Tensile testing at ambient temperature
GB/T 5027 Determination of plastic strain ratio (r-value) of sheet and strip of metallic materials*， 2016-11-01 Update
GB/T 8170 Rules of rounding off for numerical values & expression and judgement of limiting values

2008 GB/T 5028-2008 Metallic materials.Sheet and strip.Determination of tensile strain hardening exponent
1999 GB/T 5028-1999 Metallic materials--Sheet and strip--Determination of tensile strain hardening exponent(n-values)