摘要
基于弹性杆件轴向可伸长假设,应用势能最低原理,分析两端铰支约束管道在直埋和架空条件下的热后屈曲特性,获得管端约束力、管道规格、最大变形和管内流体最高温度之间的关系方程。求解方程解析解发现,直埋管道的屈曲特性与失稳模态、材料特性、几何尺寸和温度等多种因素有关,架空管道的屈曲特性仅取决于管径、长度、壁厚和温度,与模态无关。通过分析数据,证明管道热屈曲的非突发性,并探讨Euler解的意义。采用热后屈曲理论,对比适当许可变形条件下,管道规格与管内流体温度之间关系解析解与欧拉解的差异。
Based on the assumption of extensible elastic beams,energy method was performed to analyze the thermal post-buckling behaviors of heat pipes,both in the air and underground,with immovable ends in the axial direction.The relationships among reaction force,the critical temperature,maximum deflection and pipe flexibility were obtained.Analytical solution shows that underground pipe s post-buckling performance is decided by the buckling mode,material properties,temperature and the size of pipe,meanwhile,in the ...
出处
《机械强度》
CAS
CSCD
北大核心
2010年第5期785-789,共5页
Journal of Mechanical Strength
关键词
高温管道
能量法
热屈曲
临界温度
Heat pipe
Energy method
Thermal post-buckling
Critical temperature
