scope:

This Standard specifies the method for determining the tensile strain hardening exponent n of the sheet and strip made of metallic materials.

This method is valid only for that part of the stress-strain curve in the plastic range where the curve is continuous and monotonic.

In the case of materials with a serrated stress-strain curve in the work hardening range (materials which show the Portevin-Le Chatelier effect, such as aluminiummagnesium alloy), the automatic determination (linear regression of logarithm true stress vs. logarithm true strain,) should be used to give reproducible results.

NOTE 1 In this Standard, the value of plastic strain is supposed to be used for the value of strain used for the calculation of the tensile strain hardening exponent. However, when the elastic strain is under 10 % of the total strain used for the calculation, the total strain may be used in place of the plastic strain.

NOTE 2 The International Standard corresponding to this Standard and the symbol of degree of correspondence are as follows.

ISO 10275 : 2007 Metallic materials - Sheet and strip - Determination of tensile strain hardening exponent (MOD)

The symbols which denote the degree of correspondence in the contents in the corresponding International Standard and JIS are IDT (identical), MOD (modified) and NEQ (not equivalent) according to ISO/IEC Guide 21-1.

Warning Persons carrying out tests based on this standard should be familiar with normal laboratory practice. This Standard does not purport to address all of the safety problems, if any associated with its use. It is the responsibility of the user of this Standard to establish appropriate safety and health practices.