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

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Scope

This document specifies the method to determine the tensile strain hardening exponent
(n value) of metal sheets and strips.
This method is only applicable to the part where the stress-strain curve is monotonically
rising continuously within the plastic deformation range (see 7.4).
If the stress-strain curve of the material in the work hardening stage is serrated (such as
the Portevin-Le Chatelier serration yield effect exhibited by some AlMg alloys), to
make the given results have a certain reproducibility, it shall use an automatic
measurement method (for linear regression of the log of true stress-true plastic strain,
see 7.7).

Basic Data

Standard ID	GB/T 5028-2008 (GB/T5028-2008)
Description (Translated English)	Metallic materials -- Sheet and strip -- Determination of tensile strain hardening exponent
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	H22
Classification of International Standard	77.040.10
Word Count Estimation	9,972
Date of Issue	2008-12-06
Date of Implementation	2009-10-01
Older Standard (superseded by this standard)	GB/T 5028-1999
Quoted Standard	GB/T 228; GB/T 5027; GB/T 8170; GB/T 12160; GB/T 16825.1
Adopted Standard	ISO 10275-2007, MOD
Regulation (derived from)	National Standard Approval Announcement 2008 No.19 (Total No.132)
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary	This standard specifies the metal sheet and strip tensile strain hardening exponent (n value) measurement method. This method is only applicable to plastic deformation range of stress-strain curves showed a continuous rise monotonically part (see 7. 4). If the material hardening stage stress-strain curve is serrated (eg certain AlMg alloy exhibits a serrated Portevin-Le Chatelier effect) as a result given that a certain repeatability of the automatic measuring method (on the true stress-true plastic strain logarithmic linear regression, see 7. 7).