摘要
通过单轴拉伸试验获得了聚乙烯(PE)材料弹性及屈服参数。建立了点载荷下的管-土有限元模型,研究了埋地燃气PE在点载荷下的力学响应,分析了点载荷尺寸、管道内压及管道直径的影响。基于DFDI(ductile failure damage indicator)模型,结合有限元仿真结果,对点载荷下的PE管进行了定量损伤计算。结果表明,与无点载荷管道的损伤结果对比可知,点载荷的存在增大了管道损伤;管道内压变化时管道损伤变化较大;管道直径变化时对PE管损伤影响较小,各管径下的损伤值都比较接近。
The elasticity and yield parameters of PE were determined through a uniaxial tensile experiment.A pipe⁃soil fi⁃nite element model under a point load was established to study the point⁃loading mechanical response of buried PE gas pipes,and the effects of point⁃loading dimension,pipe internal pressure,and pipe diameter were analyzed.Based on the DFDI(ductile failure damage indicator)model and combined with the finite element simulation results,quantitative dam⁃age calculations were carried out for PE pipes under a point load.The results indicated that the point load increased the pipe damage when compared to the damage results of the pipe without a point load.The pipe damage shows a great change with a variation of the internal pressure of the pipe.There is little effect on the PE pipe damage with a small change in the pipe diameter,and the damage values under each pipe diameter are relatively close to each other.
作者
蒲强
何霞
王国荣
胡刚
PU Qiang;HE Xia;WANG Guorong;HU Gang(School of Mechatronic Engineering,Southwest Petroleum University,Chengdu 610500,China;Energy Equipment Institute,Southwest Petroleum University,Chengdu 610500,China)
出处
《中国塑料》
CAS
CSCD
北大核心
2024年第3期67-72,共6页
China Plastics
基金
深水钻井工程四川省自然科学基金创新研究群体(2023NSFSC1980)。
关键词
聚乙烯
燃气管道
点载荷
DFDI模型
管道损伤
polyethylene
gas piping
point load
ductile failure damage indicator model
pipe damage
