结构钢单向拉伸时的非线性应力应变曲线

Nonlinear tensile stress strain curves of structural steel

采用Ｒａｍｂｅｒｇ—Ｏｓｇｏｏｄ公式，根据试验的应变、应力点用最小二乘法求出公式中的参数，使得这种非线性应力应变关系以解析形式用于研究．通过与已有文献的比较，可知本文方法有较高的精度．

The parameters in the Ramberg Osgood equation are evaluated in terms of experimental data and the least square method so that the nonlinear stress strain curves can be adopted in an analytical way.It reveals that the method suggested in this paper has more accuracy, and the fit curves of structural steel testing points are given as a final application.