本文件规定了确定由金属材料制成的扁平产品（片材和带材）的拉伸应变硬化指数n的方法。 该方法仅对塑性范围内应力-应变曲线中曲线连续单调的那部分有效（见8.4）。 在加工硬化范围内具有锯齿状应力-应变曲线的材料（显示Portevin-Le Chatelier效应的材料，例如AlMg合金）的情况下，自动测定（对数真实应力与对数真实塑性应变的线性回归，见8.7）用于给出可重复的结果。

This document specifies a method for determining the tensile strain hardening exponent n of flat products (sheet and strip) made of metallic materials. The method is valid only for that part of the stress-strain curve in the plastic range where the curve is continuous and monotonic (see 8.4). In the case of materials with a serrated stress-strain curve in the work hardening range (materials which show the Portevin-Le Chatelier effect, e.g. AlMg-alloys), the automatic determination (linear regression of the logarithm true stress vs. the logarithm true plastic strain, see 8.7) is used to give reproducible results.