抗大变形管线管应变硬化指数的确定方法研究

详细信息

Study on Method as Used to Determine Strain Hardening Exponent of Linepipe with High Deformation Resistance

摘要: 总结了应力-应变曲线的4种常用数学模型；针对真应力-真应变曲线的幂函数本构方程，研究了以屈强比为参数的应变硬化指数n_H的拟合方法，并将两种钢级管线钢实测的真应力-真应变曲线与拟合的曲线进行对比。对比分析认为：应变硬化指数n_H随着管线钢材料屈强比的升高而减小；由n_H确定的Hollomon幂函数方程能够简单准确地描述大变形管线钢的真应力-真应变曲线。
- 管线管 /
- 大变形 /
- 应变硬化指数 /
- 屈强比 /
- 幂函数
Abstract: Summarized here in the paper are the four commonly-used mathematical models of stress-strain curve.In light with the power function constitutive equation of the true stress-train curve,the fitting method for the strain hardening exponent n_H with the yield ratio as the parameter are studied.The measured true stress-strain curves of the linepipe as made in two different steel grades are compared with the fitting curves.As a result of the analysis,it is regarded that the sad strain hardening exponent n_H is decreased along with the increase of the yield ratio;and that the Hollomon power function equation as determined by n_H can be used to simply and accurately describing the true tress-strain curve of the high deformationresistant linepipe.
- linepipe /
- high deformation /
- strain hardening exponent /
- yield ratio /
- power function