摘要
基于弹塑性基本理论,针对随动强化材料模型,以临界强度因子为开裂准则,采用退化奇异单元并编制弹塑性有限元程序,成功地模拟了管材疲劳裂纹的动态扩展过程。模拟结果与试验结果吻合较好,能很好地反映过载迟滞效应等现象。
As a result of experimental complexity of pipeline fatigue crack propagation,numerical simulation could take an important role. Based on the classical elastic-plastic theory, an elastic plastic finite element program was developed respectively for kinematic hardening material, which had a successful simulation of fatigue crack propagation with a singularity isoparametric element and the criterion of critical intensity factor. The results of simulations of specimen were well coincide with the experimental ones,and which also can reflect the phenomenon of overloading delay very well. So,the numerical simulation is very important to anticipate the velocity of pipeline fatigue crack propagation.
出处
《石油化工设备》
CAS
2009年第2期23-27,共5页
Petro-Chemical Equipment
基金
国家"十一五"科技支撑计划项目--生命线工程安全保障关键技术研究及工程示范(2006BAK02B01-2)
关键词
管道
随动强化
临界强度因子
退化奇异单元
数值模拟
疲劳扩展速率
pipeline
kinematic hardening
critical intensity factor
singularity isoparametricelement
numerical simulation
velocity of fatigue crack propagation
