大直径复合绝缘子法兰胶装节点损伤及结构参数影响研究  

Damage and Influence of Structure Parameters of Flange Joint of Large-Diameter Composite Insulator

作　　者：张若愚 曹枚根 李惠庸 ZHANG Ruoyu;CAO Meigen;LI Huiyong(College of Civil Engineering,North China University of Technology,Beijing 100144,China;Economic Technology Research Institute,Gansu Electric Power Corporation,Lanzhou 730050,China)

机构地区：[1]北方工业大学土木工程学院,北京100144 [2]国网甘肃省电力公司经济技术研究院,兰州730050

出　　处：《电瓷避雷器》2022年第2期213-220,共8页Insulators and Surge Arresters

基　　金：电网输变电设备防灾减灾国家重点实验室2020年开放基金项目(编号:B316AF190007)。

摘　　要：为研究大直径复合绝缘子承载力特性及法兰胶装节点破坏过程,建立基于内聚力材料模型(CZM)的复合支柱绝缘子法兰胶装节点精细化有限元模型,模拟法兰节点区域在弯矩荷载作用下的破坏,并分析结构参数对大直径复合绝缘子承载能力的影响。分析结果表明,大直径复合绝缘子承载过程分为套管线性承载阶段和法兰节点非线性承载阶段,胶装节点脱粘破坏后,复合套管有竖直向上滑移的趋势,胶装处裂缝宽度为4.13 mm。大直径复合绝缘子线性阶段极限承载力35.1 kN,粘结层完全破坏时极限承载力为46.5 kN,此时复合套管的最大应力仅为49 MPa,远小于复合材料的极限破坏应力;增大法兰壁高度可以提升法兰节点的胶装比,胶装比越大,其抗侧刚度越大,对绝缘子的线性承载力和极限承载力的提升越明显,增大套管厚度可小幅提升的绝缘子的承载能力,复合绝缘子整体结构承载能力主要由胶装节点粘结性能和粘结高度决定;法兰根部容易出现局部应力过大的情况,在承载过程中很容易发生脆性开裂,设置加劲肋可以使法兰根部应力降低58%。In order to study the characteristics of bearing capacity of large-diameter composite insulator and the failure process of flange joint, a refined finite element model of large-diameter composite insulator flange bonded joint based on the cohesive material model(CZM) was established to simulate the fai-lure of the area of flange joint under bending moment load, and the influence of structural parameters on the bearing capacity of large-diameter composite insulator was analyzed. The results show that: the load-bearing process of large-diameter composite insulator can be divided into linear load-bearing stage of bushing and nonlinear load-bearing stage of flange joint. After the debonding failure of joint, the composite bushing has the tendency of vertical upward sliding, and the crack width at the glued joint is 4.13 mm;the linear elastic load-bearing capacity limit of large-diameter composite insulator is 35.1 kN. When the bonding layer is completely damaged, the ultimate load-bearing capacity is 46.5 kN, the maximum stress of composite sleeve is only 49 MPa, far less than the ultimate failure stress of composite material;increasing the height of flange wall can improve the glue ratio of flange joint, the larger the glue ratio is, the greater the lateral stiffness is, the more obvious the linear bearing capacity and ultimate bearing capacity of large-diameter composite insulator are, and the bearing capacity of large-diameter composite insulator can be improved by increasing the thickness of bushing, and the bearing capacity of composite insulator is determined by the bonding performance and bonding height of the bonded joint;the large local stress is easy to occur at the root of flange, and also the brittle cracking is easy to occur during the bearing process;setting stiffener can reduce the stress at the root of flange by 58%.

关 键 词：大直径复合绝缘子 内聚力材料模型 法兰胶装节点 粘结破坏 承载能力 

分 类 号：TM216[一般工业技术—材料科学与工程]