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。
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.
出处
《石油化工高等学校学报》
CAS
2009年第2期56-58,共3页
Journal of Petrochemical Universities
基金
国家"十一五"支撑计划课题资助(2006BAK02B01-12)
关键词
CTOA试件
试验测试
三维有限元模拟
公式拟合
止裂
CTOA Specimen
Experimental research
3D finite element simulation
Fitting formula
Arrest
