摘要
为研究含穿孔管道的局部力学特性,以X70管道为研究对象,基于弹塑性力学知识,利用ANSYS模拟其在运行压力作用下穿孔局部的等效应力和塑性应变分布,分析了穿孔局部的最大等效应力、塑性应变随内压的变化趋势,获得了穿孔局部屈服时达到极限强度和出现裂纹时的极限内压.进一步讨论了在特定运行压力下,外穿孔局部最大等效塑性应变随穿孔外侧半径、管壁厚度和口径变化的趋势。发现:穿孔局部最大等效塑性应变随穿孔外侧半径的增加快速减小一段后开始波动变化;随壁厚的增加迅速减小;随口径的增大迅速增大.
In order to study the local mechanical properties of pipeline s perforation,taking X70 pipeline as the research object,based on the knowledge of elastic-plastic mechanics,the distribution near perforation of von Mises stress and plastic strain under the action of operating pressure and high temperature were simulated by applying ANSYS.The variation trend of the maximum von Mises stress and plastic strain with the operating pressure were analyzed to obtain the limit internal pressure when the local yield and cracks appear.With the change of small pore size,wall thickness and diameter,the variation trend of the maximum von Mises plastic strain of the external perforation under the specific operating pressure was also discussed.It is found that the maximum von Mises plastic strain of the perforation decreases rapidly with the increase of the outer radius of the perforation,and then fluctuates;it decreases with the increase of wall thickness;with the increase of diameter,it increases quickly.
作者
杨东财
Yang Dongcai(Daqing Gaoxin City Construction Investment Development Co.,Ltd.,Daqing 163361,China)
出处
《沈阳大学学报（自然科学版）》
CAS
2018年第3期183-187,共5页
Journal of Shenyang University：Natural Science
关键词
天然气管道
X70
穿孔
等效应力
等效塑性应变
壁厚
口径
natural gas pipeline
X70
perforation
von Mises stress
von Mises plastic strain
wall thickness
caliber
