管线钢断裂过程中CTOA的三维有限元模拟

石油化工高等学校学报 ›› 2009, Vol. 22 ›› Issue (2): 56-58.

管线钢断裂过程中CTOA的三维有限元模拟

陈福来^1,2, 帅健¹, 许葵¹

1.中国石油大学石油工程学院,北京102249;
2.中国石油天然气勘探开发公司,北京100034

收稿日期:2008-09-07 修回日期:2009-03-13 出版日期:2009-06-25 发布日期:2009-06-25
作者简介:陈福来(1979 -), 男, 山东省单县, 博士
基金资助:
国家“ 十一五” 支撑计划课题资助(2006BAK02B01 -12)

The ３D Finite Element Simulation on CTOA During Fracture Process of Pipeline Steel

1. Faculty of Petroleum Engineering, China University of Petroleum, Beijing 102249, P. R. China; 

2. China National Oil & Gas Exploration and Development Corporation, Beijing 100034, P. R. China

Received:2008-09-07 Revised:2009-03-13 Published:2009-06-25 Online:2009-06-25

摘要/Abstract

摘要： 基于大变形理论，采用三维有限元模型模拟了CTOA试件断裂扩展过程，根据实测的管线钢应力应变关系，计算得到(CTOA) c 。模拟结果表明，(CTOA) c 的模拟计算值与试验实测值的偏差为 10%～17 .5%，且X70、X80管线钢的(CTOA) c 均随试件厚度的增加而增大并呈线性关系。基于对模拟结果的分析，拟合得到了X70 和X80管线钢(CTOA) c 的预测公式。研究成果可直接应用于管道的止裂设计，具有较大的理论意义和应用价值。

关键词: CTOA 试件 , 试验测试 , 三维有限元模拟 , 公式拟合 , 止裂

Abstract:

Based on large deformation theory, the simulation on CTOA specimen fracture process has been carried out with the 3D finite element model, according to the experimental stress-strain relation of pipeline steel, the (CTOA)c was calculated. The simulation results show that the deviations of the calculated values and the experimental values of the (CTOA)c are 10%~17.5%, and the (CTOA)c of the X70 and X80 is increased with the increasing of specimen thickness, and they have linear relation. The fitting predicted formulas of (CTOA)c are acquired by analyzing simulation results. The research findings can be applied directly in gas pipeline arrest design, therefore it is of great theoretical significance and application value.

Key words: CTOA Specimen , Experimental research , ３D finite element simulation , Fitting formula , Arrest

陈福来,帅健,许葵. 管线钢断裂过程中CTOA的三维有限元模拟[J]. 石油化工高等学校学报, 2009, 22(2): 56-58.

CHEN Fu-lai, SHUAI Jian, XU Kui. The ３D Finite Element Simulation on CTOA During Fracture Process of Pipeline Steel[J]. Journal of Petrochemical Universities, 2009, 22(2): 56-58.