摘要
采用ABAQUS有限元软件建立覆冰导线有限元模型,利用用户材料子程序VUMAT定义覆冰本构模型和删除破坏单元,实现冲击载荷作用下导线除冰过程的模拟。覆冰采用多孔弹性模型,并考虑温度和孔隙率对其力学性能的影响;引入拉伸破坏准则判断覆冰的破坏。对不同档数、档距、覆冰孔隙率、覆冰厚度、除冰时的温度、冲击载荷大小等情况下除冰过程的模拟分析表明,较小范围温度的变化对除冰率的影响很小,而其它因素对除冰效果的影响明显,在设计机械式冲击除冰装置时应予以考虑。
A numerical model consisting of adjacent spans and insulator strings of a multi-span iced transmission line section was set up with ABAQUS software. The user-defined material subroutine VUMAT of ABAQUS software was developed for introducing a porous elastic constitutive model of ice and deleting pipe elements used to model broken ice with a tensile failure criterion. A large number of de-icing scenarios were studied with parametric variables including number of spans per line section, span length, ice porosity, ice thickness, temperature and different amplitudes of shockloads. Based on above numerical simulations, the effects of adjacent span and insulator strings on the rate of de-icing were analyzed and discussed. It was shown that the process of de-icing after loading is affected obviously by all the above parameters except temperature. The obtained numerical results provided a reference for design of de-icing technique in practice.
出处
《振动与冲击》
EI
CSCD
北大核心
2012年第17期129-133,共5页
Journal of Vibration and Shock
基金
重庆市自然科学基金(CSTC2009BB7367)
中央高校基本科研业务费(CDJXS10 24 11 02)
关键词
覆冰导线
除冰
冲击载荷
数值模拟
iced conductor
de-icing
shock load
numerical simulation
