X52管线钢的本构关系及失效判据研究  

A Study on X52 Pipeline Steel Constitutive Relation and Failure Criterion

作　　者：马廷霞[1] 苟文婷 唐愚 常学平[1] 唐亮[1] 

机构地区：[1]西南石油大学机电工程学院,四川成都610500 [2]中国石油西部管道公司乌鲁木齐输油气分公司,新疆乌鲁木齐830000 [3]中国石油西南管道公司兰成渝输油分公司,四川成都610069

出　　处：《西南石油大学学报（自然科学版）》2014年第4期162-168,共7页Journal of Southwest Petroleum University(Science & Technology Edition)

基　　金：中国石油西部管道公司项目(XG11–2012–012)

摘　　要：X52管线钢广泛应用于石油天然气长输管道工程,具有良好的力学特性:强度高、塑性好。其本构关系的研究确定、矩阵表达及失效判据的建立是研究的主要内容。通过对比该材料的静力拉伸实验结果和Ramberg–Osgood本构模型,发现εεP0.2时,Ramberg–Osgood本构方程能够比较准确地反映X52管线钢的拉伸应力–应变关系,但当ε>εP0.2时,基于Ramberg–Osgood模型所得理论本构曲线与实验结果有较大的误差。基于此,对Ramberg–Osgood本构模型做出了修正,提出了X52管线钢在单向拉伸状态下的全局二段式应力应变关系式,并建立了X52管线钢本构关系的矩阵表达式。根据X52管线钢塑性极好的特点,分别研究了塑性材料基于应力的失效判据和基于应变的失效判据,给出了X52管线钢的应变控制失效准则。X52 pipeline steel is widely used in long-distance oil and gas pipeline engineering. This kind of material has its unique mechanical properties ： high strength and good plasticity. The establishment of its constitutive relation, matrix presentation and failure criterion are the main content of this study. By comparing the static tensile experimental result and the Ramberg-Osgood constitutive model, we found that when ε ≤ εP0.2, the Ramberg-Osgood constitutive equation could accurately reflect the X52 pipeline steel tensile stress-strain relationship. When ε 〉 εp0.2, however, the theoretical constitutive curve which is based on the experimental results of Ramberg-Osgood constitutive model has large error. Based on this, we have made a correction on the Osgood constitutive model and proposed X52 pipeline steel global 2-phase stress strain relation in the condition of unidirectional pull-up, and then established the matrix expression of the constitutive relation of X52 pipeline steel. According to X52 pipeline steel excellent characteristics, this paper studied the plastic material stress failure criteria and strain failure criteria, then provided the strain failure criterion of X52 pipeline steel.

关 键 词：X52管线钢 本构关系 矩阵方程 Ramberg–Osgood本构模型 失效判据 

分 类 号：TE88[石油与天然气工程—油气储运工程] TG115.52[金属学及工艺—物理冶金]