抗大变形管线管应变硬化指数的确定方法研究  

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

作　　者：甄晓川 黄进 陈燕 ZHEN Xiaochuan;HUANG Jin;CHEN Yan(Tianjin Pipe Corporation,Tianjin 300301,China)

机构地区：[1]天津钢管制造有限公司,天津300301

出　　处：《钢管》2021年第4期25-28,共4页Steel Pipe

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。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 ftting method for the strain hardening exponent nu with the yield ratio as the parameter are studied.The measured true stress-strain curves of the linepipe as made in two diferent steel grades are compared with the ftting 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 ng can be used to simply and accurately describing the true tes-strain curve of the high deformationresistant linepipe.

关 键 词：管线管 大变形 应变硬化指数 屈强比 幂函数 

分 类 号：TE973[石油与天然气工程—石油机械设备] TG142.1[一般工业技术—材料科学与工程]