Hollomon公式很好地反映了大部分金属材料在均匀塑性变形阶段的应力-应变关系: σ=Kε~n (1) 式中σ—真应力ε—真塑性应变 K—强度系数 n—应变硬化指数应变硬化指数n是金属材料的一个重要性能参数。它反应了材料抵抗进一步变形的能力。(1)式中n值通常由应力-应变坐标图上得到,或通过lgσ-lgε线性回归分析计算出。文献[1]给出了线性回归的计算公式。由于通常拉伸试验直接得到的只是工程应力-应变曲线。其真应力和真应变还要通过换 The Hollomon equation well reflects the stress-strain relationship of most metallic materials at the stage of uniform plastic deformation: σ = Kε ~ n (1) where σ-true stress ε-true plastic strain K-strength coefficient n-strain hardening index The strain hardening index n is an important performance parameter for metallic materials. It reflects the ability of the material to resist further deformation. (1) where n is usually obtained from the stress-strain plot or linear regression analysis by lgσ-lgε. Literature [1] gives the formula for calculating linear regression. As a general tensile test directly obtained only the engineering stress-strain curve. The true stress and true strain also by changing