GB/T 5028-2008 Active National standards

GB/T 5028-2008 Metallic materials—Sheet and strip—Determination of tensile strain hardening exponent

GB/T 5028-2008 Metallic materials—Sheet and strip—Determination of tensile strain hardening exponent

Publish Date: 2008-12-06 Implement Date: 2009-10-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

Basic Information

Standard Code: GB/T 5028-2008

Standard Type: National standards

Standard Status: Active

is_force_gb: no

CCS Name: \n Test methods for the mechanical properties of metals

ICS Name: Mechanical testing of metal materials

Publish Date: 2008-12-06

Implement Date: 2009-10-01

Pages: 8 pages

Scope

This standard specifies the method for determining the tensile strain hardening index (n value) of metal sheets and strips.
This method is only applicable to the part of the stress-strain curve that shows a monotonous and continuous increase within the range of plastic deformation (see 7.4).
If the stress-strain curve of the material shows a sawtooth pattern during the processing hardening stage (such as the Portevin-Le Chatelier sawtooth yielding effect exhibited by some AlMg alloys), in order to ensure the repeatability of the results, an automatic measurement method should be used (linear regression of the logarithm of the true stress against the true plastic strain, see 7.7).

Development Information

Word Count: 13 Thousand words Pages: 8 pages

Replace the following standards

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

Referenced Standards

GB/T 228-2002 Metallic materials—Tensile testing at ambient temperature GB/T 228.1-2010 Metallic materials—Tensile testing—Part 1:Method of test at room temperature GB/T 228.1-2021 Metallic materials—Tensile testing—Part 1:Method of test at room temperature GB/T 228.2-2015 Metallic materials—Tensile testing—Part 2:Method of test at elevated temperature GB/T 228.3-2019 Metallic materials—Tensile testing—Part 3:Method of test at low temperature GB/T 228.4-2019 Metallic materials—Tensile testing—Part 4:Method of test in liquid helium GB/T 5027-1999 Metallic materials—Sheet and strip—Determination of plastic strain ratio(r-values) GB/T 5027-2007 Metallic materials—Sheet and strip—Determination of plastic strain ratio GB/T 5027-2016 Metallic materials—Sheet and strip—Determination of plastic strain ratio GB/T 8170-1987 Rules for rounding off of numberical values GB/T 8170-2008 Rules of rounding off for numerical values & expression and judgement of limiting values GB/T 12160-2002 Calibration of extensometers used in uniaxial testing GB/T 12160-2019 Metallic materials—Calibration of extensometers systems used in uniaxial testing GB/T 16825.1-2002 Verification of static uniaxial testing machines—Part 1:Tension/compression testing machines—Verification and calibration of the force-measuring system GB/T 16825.1-2008 Verification of static uniaxial testing machines—Part 1:Tension/compression testing machines—Verification and calibration of the force-measuring system GB/T 16825.1-2022 Metallic materials—Calibration and verification of static uniaxial testing machines—Part 1:Tension/compression testing machines—Calibration and verification of the force-measuring system GB/T 5027-2025 Metallic materials—Sheet and strip—Determination of plastic strain ratio(r)

Adopt standards

ISO 10275:2007

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