掀物线型的应变硬化方程((?)=A∈~m)可以精确地用来表示许多材料的应力应变特征。其中,(?)为真应力,A 为强度系数.∈为真塑性应变,而m 为应变硬化指数。材料性能——A 和m——可由拉力试验的负荷应变曲线确定。遗憾的是,大多数手册没有列出这些数值,而手册却有代表性地列出了屈服应力(0.002塑性变形时的应力)、极限应力和延伸率。本文即为用上述三个特性来估计A、m 值的一种图解法。而在大多数 The strain hardening equation for the linear model ((?) = A∈ ~ m) can be accurately used to represent the stress-strain characteristics of many materials. Where (?) Is true stress and A is the strength coefficient, ε is the true plastic strain, and m is the strain hardening index. Material properties - A and m - can be determined by the load-strain curve of a tensile test. Unfortunately, most of the manuals do not list these values, but the manuals typically list the yield stress (0.002 plastic deformation stress), ultimate stress and elongation. This article is to use the above three characteristics to estimate A, m value of a graphical method. And in most